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Subject[PATCH 05/11] capsicum: convert callers to use fgetr() etc
Date
Convert places that use fget()-like functions to use the
equivalent fgetr() variant instead.

Annotate each such call with an indication of what operations will
be performed on the retrieved struct file, to allow future policing
of rights associated with file descriptors.

Also change each call site to cope with an ERR_PTR return from
fgetr() rather than a plain NULL failure from fget().

Signed-off-by: David Drysdale <drysdale@google.com>
---
arch/alpha/kernel/osf_sys.c | 6 +-
arch/ia64/kernel/perfmon.c | 54 +++++++-----
arch/parisc/hpux/fs.c | 6 +-
arch/powerpc/kvm/powerpc.c | 4 +-
arch/powerpc/platforms/cell/spu_syscalls.c | 15 ++--
drivers/base/dma-buf.c | 6 +-
drivers/block/loop.c | 14 +--
drivers/block/nbd.c | 2 +-
drivers/infiniband/core/ucma.c | 4 +-
drivers/infiniband/core/uverbs_cmd.c | 6 +-
drivers/infiniband/core/uverbs_main.c | 4 +-
drivers/infiniband/hw/usnic/usnic_transport.c | 2 +-
drivers/md/md.c | 8 +-
drivers/staging/android/sync.c | 2 +-
drivers/staging/lustre/lustre/llite/file.c | 6 +-
drivers/staging/lustre/lustre/lmv/lmv_obd.c | 7 +-
drivers/staging/lustre/lustre/mdc/lproc_mdc.c | 8 +-
drivers/staging/lustre/lustre/mdc/mdc_request.c | 4 +-
drivers/vfio/pci/vfio_pci.c | 6 +-
drivers/vfio/pci/vfio_pci_intrs.c | 6 +-
drivers/vfio/vfio.c | 6 +-
drivers/vhost/net.c | 6 +-
drivers/video/fbdev/msm/mdp.c | 4 +-
fs/aio.c | 37 +++++++-
fs/autofs4/dev-ioctl.c | 16 ++--
fs/autofs4/inode.c | 4 +-
fs/btrfs/ioctl.c | 20 +++--
fs/btrfs/send.c | 7 +-
fs/cifs/ioctl.c | 6 +-
fs/coda/inode.c | 4 +-
fs/coda/psdev.c | 2 +-
fs/compat.c | 18 ++--
fs/compat_ioctl.c | 14 ++-
fs/eventfd.c | 17 ++--
fs/eventpoll.c | 19 +++--
fs/ext4/ioctl.c | 6 +-
fs/fcntl.c | 101 ++++++++++++++++++++--
fs/fhandle.c | 6 +-
fs/fuse/inode.c | 10 ++-
fs/ioctl.c | 13 ++-
fs/locks.c | 8 +-
fs/notify/fanotify/fanotify_user.c | 16 ++--
fs/notify/inotify/inotify_user.c | 12 +--
fs/ocfs2/cluster/heartbeat.c | 8 +-
fs/open.c | 42 +++++----
fs/proc/namespaces.c | 6 +-
fs/read_write.c | 108 ++++++++++++++----------
fs/readdir.c | 18 ++--
fs/select.c | 11 ++-
fs/signalfd.c | 6 +-
fs/splice.c | 34 +++++---
fs/stat.c | 10 ++-
fs/statfs.c | 8 +-
fs/sync.c | 21 +++--
fs/timerfd.c | 40 +++++++--
fs/utimes.c | 10 ++-
fs/xattr.c | 26 +++---
fs/xfs/xfs_ioctl.c | 14 +--
ipc/mqueue.c | 30 +++----
kernel/events/core.c | 14 +--
kernel/module.c | 10 ++-
kernel/sys.c | 6 +-
kernel/taskstats.c | 4 +-
kernel/time/posix-clock.c | 27 +++---
mm/fadvise.c | 7 +-
mm/internal.h | 19 +++++
mm/memcontrol.c | 12 +--
mm/mmap.c | 7 +-
mm/nommu.c | 9 +-
mm/readahead.c | 6 +-
net/9p/trans_fd.c | 10 +--
sound/core/pcm_native.c | 10 ++-
virt/kvm/eventfd.c | 6 +-
virt/kvm/vfio.c | 12 +--
74 files changed, 686 insertions(+), 387 deletions(-)

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 1402fcc11c2c..8f2d9597096b 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -146,7 +146,7 @@ SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
long __user *, basep)
{
int error;
- struct fd arg = fdget(fd);
+ struct fd arg = fdgetr(fd, CAP_READ);
struct osf_dirent_callback buf = {
.ctx.actor = osf_filldir,
.dirent = dirent,
@@ -154,8 +154,8 @@ SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
.count = count
};

- if (!arg.file)
- return -EBADF;
+ if (IS_ERR(arg.file))
+ return PTR_ERR(arg.file);

error = iterate_dir(arg.file, &buf.ctx);
if (error >= 0)
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index d841c4bd6864..d81ff6523ca9 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -471,6 +471,7 @@ typedef struct {
int cmd_flags;
unsigned int cmd_narg;
size_t cmd_argsize;
+ u64 cmd_right;
int (*cmd_getsize)(void *arg, size_t *sz);
} pfm_cmd_desc_t;

@@ -4620,31 +4621,40 @@ pfm_exit_thread(struct task_struct *task)
/*
* functions MUST be listed in the increasing order of their index (see permfon.h)
*/
-#define PFM_CMD(name, flags, arg_count, arg_type, getsz) { name, #name, flags, arg_count, sizeof(arg_type), getsz }
-#define PFM_CMD_S(name, flags) { name, #name, flags, 0, 0, NULL }
+#define PFM_CMD(name, flags, arg_count, arg_type, right, getsz) \
+ { name, #name, flags, arg_count, sizeof(arg_type), right, getsz }
+#define PFM_CMD_S(name, flags, right) \
+ { name, #name, flags, 0, 0, right, NULL }
#define PFM_CMD_PCLRWS (PFM_CMD_FD|PFM_CMD_ARG_RW|PFM_CMD_STOP)
#define PFM_CMD_PCLRW (PFM_CMD_FD|PFM_CMD_ARG_RW)
-#define PFM_CMD_NONE { NULL, "no-cmd", 0, 0, 0, NULL}
+#define PFM_CMD_NONE { NULL, "no-cmd", 0, 0, 0, 0, NULL}

static pfm_cmd_desc_t pfm_cmd_tab[]={
/* 0 */PFM_CMD_NONE,
-/* 1 */PFM_CMD(pfm_write_pmcs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
-/* 2 */PFM_CMD(pfm_write_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
-/* 3 */PFM_CMD(pfm_read_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
-/* 4 */PFM_CMD_S(pfm_stop, PFM_CMD_PCLRWS),
-/* 5 */PFM_CMD_S(pfm_start, PFM_CMD_PCLRWS),
+/* 1 */PFM_CMD(pfm_write_pmcs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t,
+ CAP_WRITE, NULL),
+/* 2 */PFM_CMD(pfm_write_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t,
+ CAP_WRITE, NULL),
+/* 3 */PFM_CMD(pfm_read_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t,
+ CAP_READ, NULL),
+/* 4 */PFM_CMD_S(pfm_stop, PFM_CMD_PCLRWS, CAP_PERFMON),
+/* 5 */PFM_CMD_S(pfm_start, PFM_CMD_PCLRWS, CAP_PERFMON),
/* 6 */PFM_CMD_NONE,
/* 7 */PFM_CMD_NONE,
-/* 8 */PFM_CMD(pfm_context_create, PFM_CMD_ARG_RW, 1, pfarg_context_t, pfm_ctx_getsize),
+/* 8 */PFM_CMD(pfm_context_create, PFM_CMD_ARG_RW, 1, pfarg_context_t,
+ CAP_PERFMON, pfm_ctx_getsize),
/* 9 */PFM_CMD_NONE,
-/* 10 */PFM_CMD_S(pfm_restart, PFM_CMD_PCLRW),
+/* 10 */PFM_CMD_S(pfm_restart, PFM_CMD_PCLRW, CAP_PERFMON),
/* 11 */PFM_CMD_NONE,
-/* 12 */PFM_CMD(pfm_get_features, PFM_CMD_ARG_RW, 1, pfarg_features_t, NULL),
-/* 13 */PFM_CMD(pfm_debug, 0, 1, unsigned int, NULL),
+/* 12 */PFM_CMD(pfm_get_features, PFM_CMD_ARG_RW, 1, pfarg_features_t,
+ CAP_READ, NULL),
+/* 13 */PFM_CMD(pfm_debug, 0, 1, unsigned int, CAP_PERFMON, NULL),
/* 14 */PFM_CMD_NONE,
-/* 15 */PFM_CMD(pfm_get_pmc_reset, PFM_CMD_ARG_RW, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
-/* 16 */PFM_CMD(pfm_context_load, PFM_CMD_PCLRWS, 1, pfarg_load_t, NULL),
-/* 17 */PFM_CMD_S(pfm_context_unload, PFM_CMD_PCLRWS),
+/* 15 */PFM_CMD(pfm_get_pmc_reset, PFM_CMD_ARG_RW, PFM_CMD_ARG_MANY,
+ pfarg_reg_t, CAP_READ, NULL),
+/* 16 */PFM_CMD(pfm_context_load, PFM_CMD_PCLRWS, 1, pfarg_load_t,
+ CAP_READ, NULL),
+/* 17 */PFM_CMD_S(pfm_context_unload, PFM_CMD_PCLRWS, CAP_READ),
/* 18 */PFM_CMD_NONE,
/* 19 */PFM_CMD_NONE,
/* 20 */PFM_CMD_NONE,
@@ -4659,8 +4669,10 @@ static pfm_cmd_desc_t pfm_cmd_tab[]={
/* 29 */PFM_CMD_NONE,
/* 30 */PFM_CMD_NONE,
/* 31 */PFM_CMD_NONE,
-/* 32 */PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL),
-/* 33 */PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL)
+/* 32 */PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t,
+ CAP_WRITE, NULL),
+/* 33 */PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t,
+ CAP_WRITE, NULL)
};
#define PFM_CMD_COUNT (sizeof(pfm_cmd_tab)/sizeof(pfm_cmd_desc_t))

@@ -4866,13 +4878,13 @@ restart_args:

if (unlikely((cmd_flags & PFM_CMD_FD) == 0)) goto skip_fd;

- ret = -EBADF;
-
- f = fdget(fd);
- if (unlikely(f.file == NULL)) {
+ f = fdgetr(fd, pfm_cmd_tab[cmd].cmd_right);
+ if (unlikely(IS_ERR(f.file)) {
DPRINT(("invalid fd %d\n", fd));
+ ret = PTR_ERR(f.file);
goto error_args;
}
+ ret = -EBADF;
if (unlikely(PFM_IS_FILE(f.file) == 0)) {
DPRINT(("fd %d not related to perfmon\n", fd));
goto error_args;
diff --git a/arch/parisc/hpux/fs.c b/arch/parisc/hpux/fs.c
index 2bedafea3d94..8a48b5d4bb15 100644
--- a/arch/parisc/hpux/fs.c
+++ b/arch/parisc/hpux/fs.c
@@ -105,9 +105,9 @@ int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned i
};
int error;

- arg = fdget(fd);
- if (!arg.file)
- return -EBADF;
+ arg = fdgetr(fd, CAP_READ);
+ if (IS_ERR(arg.file))
+ return PTR_ERR(arg.file);

error = iterate_dir(arg.file, &buf.ctx);
if (error >= 0)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 3cf541a53e2a..f279d852dc96 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -891,7 +891,7 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
struct kvm_device *dev;

r = -EBADF;
- f = fdget(cap->args[0]);
+ f = fdgetr(cap->args[0], CAP_FSTAT);
if (!f.file)
break;

@@ -910,7 +910,7 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
struct kvm_device *dev;

r = -EBADF;
- f = fdget(cap->args[0]);
+ f = fdgetr(cap->args[0], CAP_FSTAT);
if (!f.file)
break;

diff --git a/arch/powerpc/platforms/cell/spu_syscalls.c b/arch/powerpc/platforms/cell/spu_syscalls.c
index 38e0a1a5cec3..150c83ad8ed5 100644
--- a/arch/powerpc/platforms/cell/spu_syscalls.c
+++ b/arch/powerpc/platforms/cell/spu_syscalls.c
@@ -77,11 +77,13 @@ SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
return -ENOSYS;

if (flags & SPU_CREATE_AFFINITY_SPU) {
- struct fd neighbor = fdget(neighbor_fd);
- ret = -EBADF;
- if (neighbor.file) {
+ struct fd neighbor = fdgetr(neighbor_fd, CAP_READ, CAP_WRITE,
+ CAP_MAPEXEC);
+ if (!IS_ERR(neighbor.file)) {
ret = calls->create_thread(name, flags, mode, neighbor.file);
fdput(neighbor);
+ } else {
+ ret = PTR_ERR(neighbor.file);
}
} else
ret = calls->create_thread(name, flags, mode, NULL);
@@ -100,11 +102,12 @@ asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
if (!calls)
return -ENOSYS;

- ret = -EBADF;
- arg = fdget(fd);
- if (arg.file) {
+ arg = fdgetr(fd, CAP_READ, CAP_WRITE, CAP_MAPEXEC);
+ if (!IS_ERR(arg.file)) {
ret = calls->spu_run(arg.file, unpc, ustatus);
fdput(arg);
+ } else {
+ ret = PTR_ERR(arg.file);
}

spufs_calls_put(calls);
diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c
index ea77701deda4..46650bccaa6a 100644
--- a/drivers/base/dma-buf.c
+++ b/drivers/base/dma-buf.c
@@ -216,10 +216,10 @@ struct dma_buf *dma_buf_get(int fd)
{
struct file *file;

- file = fget(fd);
+ file = fgetr(fd, CAP_MMAP, CAP_READ, CAP_WRITE);

- if (!file)
- return ERR_PTR(-EBADF);
+ if (IS_ERR(file))
+ return (struct dma_buf *)file;

if (!is_dma_buf_file(file)) {
fput(file);
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index f70a230a2945..d4a707bc3f1b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -652,10 +652,11 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
if (!(lo->lo_flags & LO_FLAGS_READ_ONLY))
goto out;

- error = -EBADF;
- file = fget(arg);
- if (!file)
+ file = fgetr(arg, CAP_PWRITE, CAP_PREAD, CAP_FSYNC, CAP_FSTAT);
+ if (IS_ERR(file)) {
+ error = PTR_ERR(file);
goto out;
+ }

inode = file->f_mapping->host;
old_file = lo->lo_backing_file;
@@ -834,10 +835,11 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
/* This is safe, since we have a reference from open(). */
__module_get(THIS_MODULE);

- error = -EBADF;
- file = fget(arg);
- if (!file)
+ file = fgetr(arg, CAP_PWRITE, CAP_PREAD, CAP_FSYNC, CAP_FSTAT);
+ if (IS_ERR(file)) {
+ error = PTR_ERR(file);
goto out;
+ }

error = -EBUSY;
if (lo->lo_state != Lo_unbound)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 3a70ea2f7cd6..d6f55e3052fb 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -654,7 +654,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
nbd->disconnect = 0; /* we're connected now */
return 0;
}
- return -EINVAL;
+ return err;
}

case NBD_SET_BLKSIZE:
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 56a4b7ca7ee3..b3b0b1aea8aa 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1406,8 +1406,8 @@ static ssize_t ucma_migrate_id(struct ucma_file *new_file,
return -EFAULT;

/* Get current fd to protect against it being closed */
- f = fdget(cmd.fd);
- if (!f.file)
+ f = fdgetr(cmd.fd, CAP_READ, CAP_WRITE, CAP_POLL_EVENT);
+ if (IS_ERR(f.file))
return -ENOENT;

/* Validate current fd and prevent destruction of id. */
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index ea6203ee7bcc..06db7ca75e1f 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -719,9 +719,9 @@ ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,

if (cmd.fd != -1) {
/* search for file descriptor */
- f = fdget(cmd.fd);
- if (!f.file) {
- ret = -EBADF;
+ f = fdgetr(cmd.fd, CAP_FSTAT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto err_tree_mutex_unlock;
}

diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 08219fb3338b..edaf0693ab12 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -566,9 +566,9 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
{
struct ib_uverbs_event_file *ev_file = NULL;
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_LIST_END);

- if (!f.file)
+ if (IS_ERR(f.file))
return NULL;

if (f.file->f_op != &uverbs_event_fops)
diff --git a/drivers/infiniband/hw/usnic/usnic_transport.c b/drivers/infiniband/hw/usnic/usnic_transport.c
index ddef6f77a78c..5e2265792b83 100644
--- a/drivers/infiniband/hw/usnic/usnic_transport.c
+++ b/drivers/infiniband/hw/usnic/usnic_transport.c
@@ -134,7 +134,7 @@ struct socket *usnic_transport_get_socket(int sock_fd)
char buf[25];

/* sockfd_lookup will internally do a fget */
- sock = sockfd_lookup(sock_fd, &err);
+ sock = sockfd_lookupr(sock_fd, &err, CAP_SOCK_SERVER);
if (!sock) {
usnic_err("Unable to lookup socket for fd %d with err %d\n",
sock_fd, err);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2382cfc9bb3f..aad393fa4d19 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5967,12 +5967,14 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
struct inode *inode;
if (mddev->bitmap)
return -EEXIST; /* cannot add when bitmap is present */
- mddev->bitmap_info.file = fget(fd);
+ mddev->bitmap_info.file = fgetr(fd, CAP_READ);

- if (mddev->bitmap_info.file == NULL) {
+ if (IS_ERR(mddev->bitmap_info.file)) {
+ err = PTR_ERR(mddev->bitmap_info.file);
+ mddev->bitmap_info.file = NULL;
printk(KERN_ERR "%s: error: failed to get bitmap file\n",
mdname(mddev));
- return -EBADF;
+ return err;
}

inode = mddev->bitmap_info.file->f_mapping->host;
diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 3d05f662110b..a22151248011 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -400,7 +400,7 @@ static void sync_fence_free_pts(struct sync_fence *fence)

struct sync_fence *sync_fence_fdget(int fd)
{
- struct file *file = fget(fd);
+ struct file *file = fgetr(fd, CAP_IOCTL);

if (file == NULL)
return NULL;
diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 8e844a6371e0..5bb26632987d 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -2245,9 +2245,9 @@ long ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if ((file->f_flags & O_ACCMODE) == 0) /* O_RDONLY */
return -EPERM;

- file2 = fget(lsl.sl_fd);
- if (file2 == NULL)
- return -EBADF;
+ file2 = fgetr(lsl.sl_fd, CAP_FSTAT);
+ if (IS_ERR(file2))
+ return PTR_ERR(file2);

rc = -EPERM;
if ((file2->f_flags & O_ACCMODE) != 0) /* O_WRONLY or O_RDWR */
diff --git a/drivers/staging/lustre/lustre/lmv/lmv_obd.c b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
index 3ba0a0a1d945..ce32a7dea277 100644
--- a/drivers/staging/lustre/lustre/lmv/lmv_obd.c
+++ b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
@@ -877,10 +877,9 @@ static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
return -ENOTCONN;

/* at least one registration done, with no failure */
- filp = fget(lk->lk_wfd);
- if (filp == NULL) {
- return -EBADF;
- }
+ filp = fgetr(lk->lk_wfd, CAP_READ);
+ if (IS_ERR(filp))
+ return PTR_ERR(filp);
rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, lk->lk_data);
if (rc != 0 && filp != NULL)
fput(filp);
diff --git a/drivers/staging/lustre/lustre/mdc/lproc_mdc.c b/drivers/staging/lustre/lustre/mdc/lproc_mdc.c
index 2663480a68c5..7350618766f6 100644
--- a/drivers/staging/lustre/lustre/mdc/lproc_mdc.c
+++ b/drivers/staging/lustre/lustre/mdc/lproc_mdc.c
@@ -130,9 +130,11 @@ static ssize_t mdc_kuc_write(struct file *file, const char *buffer,
if (fd == 0) {
rc = libcfs_kkuc_group_put(KUC_GRP_HSM, lh);
} else {
- struct file *fp = fget(fd);
-
- rc = libcfs_kkuc_msg_put(fp, lh);
+ struct file *fp = fgetr(fd, CAP_WRITE);
+ if (IS_ERR(fp))
+ rc = PTR_ERR(fp);
+ else
+ rc = libcfs_kkuc_msg_put(fp, lh);
fput(fp);
}
OBD_FREE(lh, len);
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index bde9f93c149b..c22b103a6643 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -1606,7 +1606,9 @@ static int mdc_ioc_changelog_send(struct obd_device *obd,
cs->cs_obd = obd;
cs->cs_startrec = icc->icc_recno;
/* matching fput in mdc_changelog_send_thread */
- cs->cs_fp = fget(icc->icc_id);
+ cs->cs_fp = fgetr(icc->icc_id, CAP_WRITE);
+ if (IS_ERR(cs->cs_fp))
+ cs->cs_fp = NULL;
cs->cs_flags = icc->icc_flags;

/*
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 7ba042498857..4f79e73e9d7a 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -638,9 +638,9 @@ reset_info_exit:
*/
for (i = 0; i < hdr.count; i++) {
struct vfio_group *group;
- struct fd f = fdget(group_fds[i]);
- if (!f.file) {
- ret = -EBADF;
+ struct fd f = fdgetr(group_fds[i], CAP_FSTAT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
break;
}

diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 9dd49c9839ac..4591feea9004 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -149,9 +149,9 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
INIT_WORK(&virqfd->inject, virqfd_inject);

- irqfd = fdget(fd);
- if (!irqfd.file) {
- ret = -EBADF;
+ irqfd = fdgetr(fd, CAP_WRITE);
+ if (IS_ERR(irqfd.file)) {
+ ret = PTR_ERR(irqfd.file);
goto err_fd;
}

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 512f479d8a50..f8c71b84981f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1042,9 +1042,9 @@ static int vfio_group_set_container(struct vfio_group *group, int container_fd)
if (atomic_read(&group->container_users))
return -EINVAL;

- f = fdget(container_fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(container_fd, CAP_LIST_END);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

/* Sanity check, is this really our fd? */
if (f.file->f_op != &vfio_fops) {
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index be414d2b2b22..6fed594f12d3 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -866,11 +866,11 @@ err:

static struct socket *get_tap_socket(int fd)
{
- struct file *file = fget(fd);
+ struct file *file = fgetr(fd, CAP_READ, CAP_WRITE);
struct socket *sock;

- if (!file)
- return ERR_PTR(-EBADF);
+ if (IS_ERR(file))
+ return ERR_PTR(PTR_ERR(file));
sock = tun_get_socket(file);
if (!IS_ERR(sock))
return sock;
diff --git a/drivers/video/fbdev/msm/mdp.c b/drivers/video/fbdev/msm/mdp.c
index 113c7876c855..203fb827ae83 100644
--- a/drivers/video/fbdev/msm/mdp.c
+++ b/drivers/video/fbdev/msm/mdp.c
@@ -257,8 +257,8 @@ int get_img(struct mdp_img *img, struct fb_info *info,
struct file **filep)
{
int ret = 0;
- struct fd f = fdget(img->memory_id);
- if (f.file == NULL)
+ struct fd f = fdgetr(img->memory_id, CAP_FSTAT);
+ if (IS_ERR(f.file))
return -1;

if (MAJOR(file_inode(f.file)->i_rdev) == FB_MAJOR) {
diff --git a/fs/aio.c b/fs/aio.c
index a0ed6c7d2cd2..4a5cc7f39753 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1390,10 +1390,38 @@ rw_common:
return 0;
}

+static struct capsicum_rights *
+aio_opcode_rights(struct capsicum_rights *rights, int opcode)
+{
+ switch (opcode) {
+ case IOCB_CMD_PREAD:
+ case IOCB_CMD_PREADV:
+ cap_rights_init(rights, CAP_PREAD);
+ break;
+
+ case IOCB_CMD_PWRITE:
+ case IOCB_CMD_PWRITEV:
+ cap_rights_init(rights, CAP_PWRITE);
+ break;
+
+ case IOCB_CMD_FSYNC:
+ case IOCB_CMD_FDSYNC:
+ cap_rights_init(rights, CAP_FSYNC);
+ break;
+
+ default:
+ cap_rights_init(rights, CAP_PREAD, CAP_PWRITE, CAP_POLL_EVENT,
+ CAP_FSYNC);
+ break;
+ }
+ return rights;
+}
+
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
struct iocb *iocb, bool compat)
{
struct kiocb *req;
+ struct capsicum_rights rights;
ssize_t ret;

/* enforce forwards compatibility on users */
@@ -1416,9 +1444,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
if (unlikely(!req))
return -EAGAIN;

- req->ki_filp = fget(iocb->aio_fildes);
- if (unlikely(!req->ki_filp)) {
- ret = -EBADF;
+ req->ki_filp = fget_rights(iocb->aio_fildes,
+ aio_opcode_rights(&rights,
+ iocb->aio_lio_opcode));
+ if (unlikely(IS_ERR(req->ki_filp))) {
+ ret = PTR_ERR(req->ki_filp);
+ req->ki_filp = NULL;
goto out_put_req;
}

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 232e03d4780d..460c5be6c3f4 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -371,9 +371,9 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
goto out;
}

- pipe = fget(pipefd);
- if (!pipe) {
- err = -EBADF;
+ pipe = fgetr(pipefd, CAP_READ, CAP_WRITE, CAP_FSYNC);
+ if (IS_ERR(pipe)) {
+ err = PTR_ERR(pipe);
goto out;
}
if (autofs_prepare_pipe(pipe) < 0) {
@@ -665,11 +665,15 @@ static int _autofs_dev_ioctl(unsigned int command, struct autofs_dev_ioctl __use
*/
if (cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
- fp = fget(param->ioctlfd);
- if (!fp) {
+ struct capsicum_rights rights;
+ cap_rights_init(&rights, CAP_IOCTL, CAP_FSTAT);
+ rights.nioctls = 1;
+ rights.ioctls = &cmd;
+ fp = fget_rights(param->ioctlfd, &rights);
+ if (IS_ERR(fp)) {
if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD)
goto cont;
- err = -EBADF;
+ err = PTR_ERR(fp);
goto out;
}

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index d7bd395ab586..39e7f008734f 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -305,9 +305,9 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
sbi->sub_version = AUTOFS_PROTO_SUBVERSION;

DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
- pipe = fget(pipefd);
+ pipe = fgetr(pipefd, CAP_WRITE, CAP_FSYNC);

- if (!pipe) {
+ if (IS_ERR(pipe)) {
printk("autofs: could not open pipe file descriptor\n");
goto fail_dput;
}
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2f6d7b13b5bd..939354163c4c 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1632,10 +1632,12 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
ret = btrfs_mksubvol(&file->f_path, name, namelen,
NULL, transid, readonly, inherit);
} else {
- struct fd src = fdget(fd);
+ struct fd src = fdgetr(fd, CAP_FSTAT);
struct inode *src_inode;
- if (!src.file) {
- ret = -EINVAL;
+ if (IS_ERR(src.file)) {
+ ret = PTR_ERR(src.file);
+ if (ret == -EBADF)
+ ret = -EINVAL;
goto out_drop_write;
}

@@ -2879,9 +2881,9 @@ static long btrfs_ioctl_file_extent_same(struct file *file,

for (i = 0, info = same->info; i < count; i++, info++) {
struct inode *dst;
- struct fd dst_file = fdget(info->fd);
- if (!dst_file.file) {
- info->status = -EBADF;
+ struct fd dst_file = fdgetr(info->fd, CAP_FSTAT);
+ if (IS_ERR(dst_file.file)) {
+ info->status = PTR_ERR(dst_file.file);
continue;
}
dst = file_inode(dst_file.file);
@@ -3247,9 +3249,9 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
if (ret)
return ret;

- src_file = fdget(srcfd);
- if (!src_file.file) {
- ret = -EBADF;
+ src_file = fdgetr(srcfd, CAP_FSTAT);
+ if (IS_ERR(src_file.file)) {
+ ret = PTR_ERR(src_file.file);
goto out_drop_write;
}

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 484aacac2c89..0d0a8d9c3ddf 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -5571,9 +5571,10 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)

sctx->flags = arg->flags;

- sctx->send_filp = fget(arg->send_fd);
- if (!sctx->send_filp) {
- ret = -EBADF;
+ sctx->send_filp = fgetr(arg->send_fd, CAP_PWRITE);
+ if (IS_ERR(sctx->send_filp)) {
+ ret = PTR_ERR(sctx->send_filp);
+ sctx->send_filp = NULL;
goto out;
}

diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 77492301cc2b..82cae7765004 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -61,9 +61,9 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
return rc;
}

- src_file = fdget(srcfd);
- if (!src_file.file) {
- rc = -EBADF;
+ src_file = fdgetr(srcfd, CAP_PREAD);
+ if (IS_ERR(src_file.file)) {
+ rc = PTR_ERR(src_file.file);
goto out_drop_write;
}

diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index d9c7751f10ac..a2fc0106043e 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -128,8 +128,8 @@ static int get_device_index(struct coda_mount_data *data)
return -1;
}

- f = fdget(data->fd);
- if (!f.file)
+ f = fdgetr(data->fd, CAP_FSTAT);
+ if (IS_ERR(f.file))
goto Ebadf;
inode = file_inode(f.file);
if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index ebc2bae6c289..370768e5e2e1 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -186,7 +186,7 @@ static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
struct coda_open_by_fd_out *outp =
(struct coda_open_by_fd_out *)req->uc_data;
if (!outp->oh.result)
- outp->fh = fget(outp->fd);
+ outp->fh = fgetr(outp->fd, CAP_LIST_END);
}

wake_up(&req->uc_sleep);
diff --git a/fs/compat.c b/fs/compat.c
index 66d3d3c6b4b2..58c3992931c9 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -889,14 +889,14 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
{
int error;
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_READ);
struct compat_readdir_callback buf = {
.ctx.actor = compat_fillonedir,
.dirent = dirent
};

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (buf.result)
@@ -979,9 +979,9 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_READ);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (error >= 0)
@@ -1064,9 +1064,9 @@ COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_READ);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (error >= 0)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index e82289047272..68f3ab88f00f 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1542,10 +1542,18 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg32)
{
unsigned long arg = arg32;
- struct fd f = fdget(fd);
- int error = -EBADF;
- if (!f.file)
+ struct capsicum_rights rights;
+ struct fd f;
+ int error;
+
+ cap_rights_init(&rights, CAP_IOCTL);
+ rights.nioctls = 1;
+ rights.ioctls = &cmd;
+ f = fdget_rights(fd, &rights);
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

/* RED-PEN how should LSM module know it's handling 32bit? */
error = security_file_ioctl(f.file, cmd, arg);
diff --git a/fs/eventfd.c b/fs/eventfd.c
index d6a88e7812f3..5ec2d0fbefe2 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -319,16 +319,17 @@ static const struct file_operations eventfd_fops = {
* Returns a pointer to the eventfd file structure in case of success, or the
* following error pointer:
*
- * -EBADF : Invalid @fd file descriptor.
- * -EINVAL : The @fd file descriptor is not an eventfd file.
+ * -EBADF : Invalid @fd file descriptor.
+ * -ENOTCAPABLE : The @fd file descriptor does not have the required rights.
+ * -EINVAL : The @fd file descriptor is not an eventfd file.
*/
struct file *eventfd_fget(int fd)
{
struct file *file;

- file = fget(fd);
- if (!file)
- return ERR_PTR(-EBADF);
+ file = fgetr(fd, CAP_WRITE);
+ if (IS_ERR(file))
+ return file;
if (file->f_op != &eventfd_fops) {
fput(file);
return ERR_PTR(-EINVAL);
@@ -350,9 +351,9 @@ EXPORT_SYMBOL_GPL(eventfd_fget);
struct eventfd_ctx *eventfd_ctx_fdget(int fd)
{
struct eventfd_ctx *ctx;
- struct fd f = fdget(fd);
- if (!f.file)
- return ERR_PTR(-EBADF);
+ struct fd f = fdgetr(fd, CAP_WRITE);
+ if (IS_ERR(f.file))
+ return (struct eventfd_ctx *) f.file;
ctx = eventfd_ctx_fileget(f.file);
fdput(f);
return ctx;
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index af903128891c..53de5ffbd435 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1836,15 +1836,18 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
copy_from_user(&epds, event, sizeof(struct epoll_event)))
goto error_return;

- error = -EBADF;
- f = fdget(epfd);
- if (!f.file)
+ f = fdgetr(epfd, CAP_EPOLL_CTL);
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto error_return;
+ }

/* Get the "struct file *" for the target file */
- tf = fdget(fd);
- if (!tf.file)
+ tf = fdgetr(fd, CAP_POLL_EVENT);
+ if (IS_ERR(tf.file)) {
+ error = PTR_ERR(tf.file);
goto error_fput;
+ }

/* The target file descriptor must support poll */
error = -EPERM;
@@ -1976,9 +1979,9 @@ SYSCALL_DEFINE4(epoll_wait, int, epfd, struct epoll_event __user *, events,
return -EFAULT;

/* Get the "struct file *" for the eventpoll file */
- f = fdget(epfd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(epfd, CAP_POLL_EVENT);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

/*
* We have to check that the file structure underneath the fd
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0f2252ec274d..a26108969d9b 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -419,9 +419,9 @@ group_extend_out:
return -EFAULT;
me.moved_len = 0;

- donor = fdget(me.donor_fd);
- if (!donor.file)
- return -EBADF;
+ donor = fdgetr(me.donor_fd, CAP_PWRITE, CAP_FSTAT);
+ if (IS_ERR(donor.file))
+ return PTR_ERR(donor.file);

if (!(donor.file->f_mode & FMODE_WRITE)) {
err = -EBADF;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 79f9b09fa46b..8029981462e6 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -355,13 +355,99 @@ static int check_fcntl_cmd(unsigned cmd)
return 0;
}

+static bool fcntl_rights(unsigned int cmd, struct capsicum_rights *rights)
+{
+ switch (cmd) {
+ case F_DUPFD:
+ case F_DUPFD_CLOEXEC:
+ /*
+ * Returning true (=>use wrapped file) implies that no rights
+ * are needed.
+ */
+ cap_rights_init(rights, 0);
+ return true;
+ case F_GETFD:
+ case F_SETFD:
+ cap_rights_init(rights, 0);
+ return false;
+ case F_GETFL:
+ cap_rights_init(rights, CAP_FCNTL);
+ rights->fcntls = CAP_FCNTL_GETFL;
+ return false;
+ case F_SETFL:
+ cap_rights_init(rights, CAP_FCNTL);
+ rights->fcntls = CAP_FCNTL_SETFL;
+ return false;
+ case F_GETOWN:
+ case F_GETOWN_EX:
+ case F_GETOWNER_UIDS:
+ cap_rights_init(rights, CAP_FCNTL);
+ rights->fcntls = CAP_FCNTL_GETOWN;
+ return false;
+ case F_SETOWN:
+ case F_SETOWN_EX:
+ cap_rights_init(rights, CAP_FCNTL);
+ rights->fcntls = CAP_FCNTL_SETOWN;
+ return false;
+ case F_GETLK:
+ case F_SETLK:
+ case F_SETLKW:
+#if BITS_PER_LONG == 32
+ case F_GETLK64:
+ case F_SETLK64:
+ case F_SETLKW64:
+#endif
+ cap_rights_init(rights, CAP_FLOCK);
+ return false;
+ case F_GETSIG:
+ case F_SETSIG:
+ cap_rights_init(rights, CAP_POLL_EVENT, CAP_FSIGNAL);
+ return false;
+ case F_GETLEASE:
+ case F_SETLEASE:
+ cap_rights_init(rights, CAP_FLOCK, CAP_FSIGNAL);
+ return false;
+ case F_NOTIFY:
+ cap_rights_init(rights, CAP_NOTIFY);
+ return false;
+ case F_SETPIPE_SZ:
+ cap_rights_init(rights, CAP_SETSOCKOPT);
+ return false;
+ case F_GETPIPE_SZ:
+ cap_rights_init(rights, CAP_GETSOCKOPT);
+ return false;
+ default:
+ cap_rights_set_all(rights);
+ return false;
+ }
+}
+
+static inline struct fd fcntl_fdget_raw(unsigned int fd, unsigned int cmd,
+ struct capsicum_rights *rights)
+{
+ struct fd f;
+
+ if (fcntl_rights(cmd, rights)) {
+ /* Use the file directly, don't attempt to unwrap */
+ f = fdget_raw(fd);
+ if (f.file == NULL)
+ f.file = ERR_PTR(-EBADF);
+ } else {
+ f = fdget_raw_rights(fd, NULL, rights);
+ }
+ return f;
+}
+
SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
-{
- struct fd f = fdget_raw(fd);
+{
+ struct capsicum_rights rights;
+ struct fd f = fcntl_fdget_raw(fd, cmd, &rights);
long err = -EBADF;

- if (!f.file)
+ if (IS_ERR(f.file)) {
+ err = PTR_ERR(f.file);
goto out;
+ }

if (unlikely(f.file->f_mode & FMODE_PATH)) {
if (!check_fcntl_cmd(cmd))
@@ -381,12 +467,15 @@ out:
#if BITS_PER_LONG == 32
SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
unsigned long, arg)
-{
- struct fd f = fdget_raw(fd);
+{
+ struct capsicum_rights rights;
+ struct fd f = fcntl_fdget_raw(fd, cmd, &rights);
long err = -EBADF;

- if (!f.file)
+ if (IS_ERR(f.file)) {
+ err = PTR_ERR(f.file);
goto out;
+ }

if (unlikely(f.file->f_mode & FMODE_PATH)) {
if (!check_fcntl_cmd(cmd))
diff --git a/fs/fhandle.c b/fs/fhandle.c
index 999ff5c3cab0..325575a9084d 100644
--- a/fs/fhandle.c
+++ b/fs/fhandle.c
@@ -121,9 +121,9 @@ static struct vfsmount *get_vfsmount_from_fd(int fd)
mnt = mntget(fs->pwd.mnt);
spin_unlock(&fs->lock);
} else {
- struct fd f = fdget(fd);
- if (!f.file)
- return ERR_PTR(-EBADF);
+ struct fd f = fdgetr(fd, CAP_LOOKUP);
+ if (IS_ERR(f.file))
+ return (struct vfsmount *)f.file;
mnt = mntget(f.file->f_path.mnt);
fdput(f);
}
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 754dcf23de8a..4a49dca49c8f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1025,11 +1025,15 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
sb->s_time_gran = 1;
sb->s_export_op = &fuse_export_operations;

- file = fget(d.fd);
- err = -EINVAL;
- if (!file)
+ file = fgetr(d.fd, CAP_READ, CAP_WRITE);
+ if (IS_ERR(file)) {
+ err = PTR_ERR(file);
+ if (err == -EBADF)
+ err = -EINVAL;
goto err;
+ }

+ err = -EINVAL;
if ((file->f_op != &fuse_dev_operations) ||
(file->f_cred->user_ns != &init_user_ns))
goto err_fput;
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 8ac3fad36192..07086423983e 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -604,10 +604,15 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
{
int error;
- struct fd f = fdget(fd);
-
- if (!f.file)
- return -EBADF;
+ struct capsicum_rights rights;
+ struct fd f;
+ cap_rights_init(&rights, CAP_IOCTL);
+ rights.nioctls = 1;
+ rights.ioctls = &cmd;
+ f = fdget_rights(fd, &rights);
+
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
error = security_file_ioctl(f.file, cmd, arg);
if (!error)
error = do_vfs_ioctl(f.file, fd, cmd, arg);
diff --git a/fs/locks.c b/fs/locks.c
index e390bd9ae068..375fac3392b9 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1816,19 +1816,21 @@ EXPORT_SYMBOL(flock_lock_file_wait);
*/
SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_FLOCK);
struct file_lock *lock;
int can_sleep, unlock;
int error;

- error = -EBADF;
- if (!f.file)
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

can_sleep = !(cmd & LOCK_NB);
cmd &= ~LOCK_NB;
unlock = (cmd == LOCK_UN);

+ error = -EBADF;
if (!unlock && !(cmd & LOCK_MAND) &&
!(f.file->f_mode & (FMODE_READ|FMODE_WRITE)))
goto out_putf;
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 732648b270dc..e2d80e045b85 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -420,11 +420,12 @@ static int fanotify_find_path(int dfd, const char __user *filename,
dfd, filename, flags);

if (filename == NULL) {
- struct fd f = fdget(dfd);
+ struct fd f = fdgetr(dfd, CAP_FSTAT);

- ret = -EBADF;
- if (!f.file)
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
+ }

ret = -ENOTDIR;
if ((flags & FAN_MARK_ONLYDIR) &&
@@ -444,7 +445,8 @@ static int fanotify_find_path(int dfd, const char __user *filename,
if (flags & FAN_MARK_ONLYDIR)
lookup_flags |= LOOKUP_DIRECTORY;

- ret = user_path_at(dfd, filename, lookup_flags, path);
+ ret = user_path_atr(dfd, filename, lookup_flags, path,
+ CAP_FSTAT, CAP_LOOKUP);
if (ret)
goto out;
}
@@ -794,9 +796,9 @@ SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags,
#endif
return -EINVAL;

- f = fdget(fanotify_fd);
- if (unlikely(!f.file))
- return -EBADF;
+ f = fdgetr(fanotify_fd, CAP_NOTIFY);
+ if (unlikely(IS_ERR(f.file)))
+ return PTR_ERR(f.file);

/* verify that this is indeed an fanotify instance */
ret = -EINVAL;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 78a2ca3966c3..5b1e506b53d5 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -711,9 +711,9 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname,
if (unlikely(!(mask & ALL_INOTIFY_BITS)))
return -EINVAL;

- f = fdget(fd);
- if (unlikely(!f.file))
- return -EBADF;
+ f = fdgetr(fd, CAP_NOTIFY);
+ if (unlikely(IS_ERR(f.file)))
+ return PTR_ERR(f.file);

/* verify that this is indeed an inotify instance */
if (unlikely(f.file->f_op != &inotify_fops)) {
@@ -749,9 +749,9 @@ SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd)
struct fd f;
int ret = 0;

- f = fdget(fd);
- if (unlikely(!f.file))
- return -EBADF;
+ f = fdgetr(fd, CAP_NOTIFY);
+ if (unlikely(IS_ERR(f.file)))
+ return PTR_ERR(f.file);

/* verify that this is indeed an inotify instance */
ret = -EINVAL;
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index bf482dfed14f..615baf7ae747 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1740,9 +1740,13 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
if (fd < 0 || fd >= INT_MAX)
goto out;

- f = fdget(fd);
- if (f.file == NULL)
+ f = fdgetr(fd, CAP_FSTAT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
+ if (ret == -EBADF)
+ ret = -EINVAL;
goto out;
+ }

if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
reg->hr_block_bytes == 0)
diff --git a/fs/open.c b/fs/open.c
index f26c492f3698..f9c4e2fd7987 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -159,10 +159,11 @@ static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
error = -EINVAL;
if (length < 0)
goto out;
- error = -EBADF;
- f = fdget(fd);
- if (!f.file)
+ f = fdgetr(fd, CAP_FTRUNCATE);
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

/* explicitly opened as large or we are on 64-bit box */
if (f.file->f_flags & O_LARGEFILE)
@@ -302,12 +303,14 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)

SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len)
{
- struct fd f = fdget(fd);
- int error = -EBADF;
+ struct fd f = fdgetr(fd, CAP_WRITE);
+ int error;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
error = do_fallocate(f.file, mode, offset, len);
fdput(f);
+ } else {
+ error = PTR_ERR(f.file);
}
return error;
}
@@ -348,7 +351,7 @@ SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)

old_cred = override_creds(override_cred);
retry:
- res = user_path_at(dfd, filename, lookup_flags, &path);
+ res = user_path_atr(dfd, filename, lookup_flags, &path, CAP_FSTAT);
if (res)
goto out;

@@ -426,13 +429,14 @@ out:

SYSCALL_DEFINE1(fchdir, unsigned int, fd)
{
- struct fd f = fdget_raw(fd);
+ struct fd f = fdgetr_raw(fd, CAP_FCHDIR);
struct inode *inode;
int error = -EBADF;

- error = -EBADF;
- if (!f.file)
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

inode = file_inode(f.file);

@@ -513,13 +517,15 @@ out_unlock:

SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_FCHMOD);
int err = -EBADF;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
audit_inode(NULL, f.file->f_path.dentry, 0);
err = chmod_common(&f.file->f_path, mode);
fdput(f);
+ } else {
+ err = PTR_ERR(f.file);
}
return err;
}
@@ -530,7 +536,7 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode
int error;
unsigned int lookup_flags = LOOKUP_FOLLOW;
retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
+ error = user_path_atr(dfd, filename, lookup_flags, &path, CAP_FCHMODAT);
if (!error) {
error = chmod_common(&path, mode);
path_put(&path);
@@ -603,7 +609,7 @@ SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user,
if (flag & AT_EMPTY_PATH)
lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
+ error = user_path_atr(dfd, filename, lookup_flags, &path, CAP_FCHOWNAT);
if (error)
goto out;
error = mnt_want_write(path.mnt);
@@ -634,11 +640,13 @@ SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group

SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
{
- struct fd f = fdget(fd);
- int error = -EBADF;
+ struct fd f = fdgetr(fd, CAP_FCHOWN);
+ int error;

- if (!f.file)
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

error = mnt_want_write_file(f.file);
if (error)
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 89026095f2b5..dc29c4d6f050 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -272,9 +272,9 @@ struct file *proc_ns_fget(int fd)
{
struct file *file;

- file = fget(fd);
- if (!file)
- return ERR_PTR(-EBADF);
+ file = fgetr(fd, CAP_SETNS);
+ if (IS_ERR(file))
+ return file;

if (file->f_op != &ns_file_operations)
goto out_invalid;
diff --git a/fs/read_write.c b/fs/read_write.c
index bd4cc3770b42..29404f2245f2 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -274,9 +274,9 @@ static inline void fdput_pos(struct fd f)
SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
{
off_t retval;
- struct fd f = fdget_pos(fd);
- if (!f.file)
- return -EBADF;
+ struct fd f = fdgetr_pos(fd, CAP_SEEK);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

retval = -EINVAL;
if (whence <= SEEK_MAX) {
@@ -302,11 +302,11 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
unsigned int, whence)
{
int retval;
- struct fd f = fdget_pos(fd);
+ struct fd f = fdgetr_pos(fd, CAP_SEEK);
loff_t offset;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

retval = -EINVAL;
if (whence > SEEK_MAX)
@@ -505,15 +505,17 @@ static inline void file_pos_write(struct file *file, loff_t pos)

SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
- struct fd f = fdget_pos(fd);
- ssize_t ret = -EBADF;
+ struct fd f = fdgetr_pos(fd, CAP_READ);
+ ssize_t ret;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
+ } else {
+ ret = PTR_ERR(f.file);
}
return ret;
}
@@ -521,15 +523,17 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
- struct fd f = fdget_pos(fd);
- ssize_t ret = -EBADF;
+ struct fd f = fdgetr_pos(fd, CAP_WRITE);
+ ssize_t ret;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
loff_t pos = file_pos_read(f.file);
ret = vfs_write(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

return ret;
@@ -544,12 +548,14 @@ SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf,
if (pos < 0)
return -EINVAL;

- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_PREAD);
+ if (!IS_ERR(f.file)) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PREAD)
ret = vfs_read(f.file, buf, count, &pos);
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

return ret;
@@ -564,12 +570,14 @@ SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
if (pos < 0)
return -EINVAL;

- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_PWRITE);
+ if (!IS_ERR(f.file)) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PWRITE)
ret = vfs_write(f.file, buf, count, &pos);
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

return ret;
@@ -804,15 +812,17 @@ EXPORT_SYMBOL(vfs_writev);
SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct fd f = fdget_pos(fd);
- ssize_t ret = -EBADF;
+ struct fd f = fdgetr_pos(fd, CAP_READ);
+ ssize_t ret;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
loff_t pos = file_pos_read(f.file);
ret = vfs_readv(f.file, vec, vlen, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

if (ret > 0)
@@ -824,15 +834,17 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct fd f = fdget_pos(fd);
- ssize_t ret = -EBADF;
+ struct fd f = fdgetr_pos(fd, CAP_WRITE);
+ ssize_t ret;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

if (ret > 0)
@@ -852,17 +864,19 @@ SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
struct fd f;
- ssize_t ret = -EBADF;
+ ssize_t ret;

if (pos < 0)
return -EINVAL;

- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_PREAD);
+ if (!IS_ERR(f.file)) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PREAD)
ret = vfs_readv(f.file, vec, vlen, &pos);
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

if (ret > 0)
@@ -876,17 +890,19 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
struct fd f;
- ssize_t ret = -EBADF;
+ ssize_t ret;

if (pos < 0)
return -EINVAL;

- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_PWRITE);
+ if (!IS_ERR(f.file)) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PWRITE)
ret = vfs_writev(f.file, vec, vlen, &pos);
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}

if (ret > 0)
@@ -975,12 +991,12 @@ COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
const struct compat_iovec __user *,vec,
compat_ulong_t, vlen)
{
- struct fd f = fdget_pos(fd);
+ struct fd f = fdgetr_pos(fd, CAP_READ);
ssize_t ret;
loff_t pos;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
pos = f.file->f_pos;
ret = compat_readv(f.file, vec, vlen, &pos);
if (ret >= 0)
@@ -998,9 +1014,9 @@ static long __compat_sys_preadv64(unsigned long fd,

if (pos < 0)
return -EINVAL;
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_PREAD);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PREAD)
ret = compat_readv(f.file, vec, vlen, &pos);
@@ -1052,12 +1068,12 @@ COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
const struct compat_iovec __user *, vec,
compat_ulong_t, vlen)
{
- struct fd f = fdget_pos(fd);
+ struct fd f = fdgetr_pos(fd, CAP_WRITE);
ssize_t ret;
loff_t pos;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
pos = f.file->f_pos;
ret = compat_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
@@ -1075,9 +1091,9 @@ static long __compat_sys_pwritev64(unsigned long fd,

if (pos < 0)
return -EINVAL;
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_PWRITE);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PWRITE)
ret = compat_writev(f.file, vec, vlen, &pos);
@@ -1118,9 +1134,11 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
* Get input file, and verify that it is ok..
*/
retval = -EBADF;
- in = fdget(in_fd);
- if (!in.file)
+ in = fdgetr(in_fd, CAP_PREAD);
+ if (IS_ERR(in.file)) {
+ retval = PTR_ERR(in.file);
goto out;
+ }
if (!(in.file->f_mode & FMODE_READ))
goto fput_in;
retval = -ESPIPE;
@@ -1140,9 +1158,11 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
* Get output file, and verify that it is ok..
*/
retval = -EBADF;
- out = fdget(out_fd);
- if (!out.file)
+ out = fdgetr(out_fd, CAP_WRITE);
+ if (IS_ERR(out.file)) {
+ retval = PTR_ERR(out.file);
goto fput_in;
+ }
if (!(out.file->f_mode & FMODE_WRITE))
goto fput_out;
retval = -EINVAL;
diff --git a/fs/readdir.c b/fs/readdir.c
index 5b53d995cae6..fffbc8395236 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -108,14 +108,14 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
struct old_linux_dirent __user *, dirent, unsigned int, count)
{
int error;
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_READ);
struct readdir_callback buf = {
.ctx.actor = fillonedir,
.dirent = dirent
};

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (buf.result)
@@ -204,9 +204,9 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_READ);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (error >= 0)
@@ -284,9 +284,9 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_READ);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

error = iterate_dir(f.file, &buf.ctx);
if (error >= 0)
diff --git a/fs/select.c b/fs/select.c
index 467bb1cb3ea5..079bb7e9c126 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -449,8 +449,8 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
break;
if (!(bit & all_bits))
continue;
- f = fdget(i);
- if (f.file) {
+ f = fdgetr(i, CAP_POLL_EVENT);
+ if (!IS_ERR(f.file)) {
const struct file_operations *f_op;
f_op = f.file->f_op;
mask = DEFAULT_POLLMASK;
@@ -487,6 +487,9 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
} else if (busy_flag & mask)
can_busy_loop = true;

+ } else if (PTR_ERR(f.file) != -EBADF) {
+ retval = PTR_ERR(f.file);
+ break;
}
}
if (res_in)
@@ -757,9 +760,9 @@ static inline unsigned int do_pollfd(struct pollfd *pollfd, poll_table *pwait,
mask = 0;
fd = pollfd->fd;
if (fd >= 0) {
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_POLL_EVENT);
mask = POLLNVAL;
- if (f.file) {
+ if (!IS_ERR(f.file)) {
mask = DEFAULT_POLLMASK;
if (f.file->f_op->poll) {
pwait->_key = pollfd->events|POLLERR|POLLHUP;
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 424b7b65321f..949fdb4d1ae9 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -288,9 +288,9 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
if (ufd < 0)
kfree(ctx);
} else {
- struct fd f = fdget(ufd);
- if (!f.file)
- return -EBADF;
+ struct fd f = fdgetr(ufd, CAP_FSIGNAL);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
ctx = f.file->private_data;
if (f.file->f_op != &signalfd_fops) {
fdput(f);
diff --git a/fs/splice.c b/fs/splice.c
index e246954ea48c..279b47455149 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1636,14 +1636,16 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
return 0;

error = -EBADF;
- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_WRITE);
+ if (!IS_ERR(f.file)) {
if (f.file->f_mode & FMODE_WRITE)
error = vmsplice_to_pipe(f.file, iov, nr_segs, flags);
else if (f.file->f_mode & FMODE_READ)
error = vmsplice_to_user(f.file, iov, nr_segs, flags);

fdput(f);
+ } else {
+ error = PTR_ERR(f.file);
}

return error;
@@ -1681,19 +1683,23 @@ SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in,
return 0;

error = -EBADF;
- in = fdget(fd_in);
- if (in.file) {
+ in = fdgetr(fd_in, CAP_PREAD);
+ if (!IS_ERR(in.file)) {
if (in.file->f_mode & FMODE_READ) {
- out = fdget(fd_out);
- if (out.file) {
+ out = fdgetr(fd_out, CAP_PWRITE);
+ if (!IS_ERR(out.file)) {
if (out.file->f_mode & FMODE_WRITE)
error = do_splice(in.file, off_in,
out.file, off_out,
len, flags);
fdput(out);
+ } else {
+ error = PTR_ERR(out.file);
}
}
fdput(in);
+ } else {
+ error = PTR_ERR(in.file);
}
return error;
}
@@ -2012,19 +2018,23 @@ SYSCALL_DEFINE4(tee, int, fdin, int, fdout, size_t, len, unsigned int, flags)
return 0;

error = -EBADF;
- in = fdget(fdin);
- if (in.file) {
+ in = fdgetr(fdin, CAP_READ);
+ if (!IS_ERR(in.file)) {
if (in.file->f_mode & FMODE_READ) {
- struct fd out = fdget(fdout);
- if (out.file) {
+ struct fd out = fdgetr(fdout, CAP_WRITE);
+ if (!IS_ERR(out.file)) {
if (out.file->f_mode & FMODE_WRITE)
error = do_tee(in.file, out.file,
len, flags);
fdput(out);
+ } else {
+ error = PTR_ERR(out.file);
}
}
- fdput(in);
- }
+ fdput(in);
+ } else {
+ error = PTR_ERR(in.file);
+ }

return error;
}
diff --git a/fs/stat.c b/fs/stat.c
index ae0c3cef9927..f40b3530eab4 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -76,12 +76,14 @@ EXPORT_SYMBOL(vfs_getattr);

int vfs_fstat(unsigned int fd, struct kstat *stat)
{
- struct fd f = fdget_raw(fd);
- int error = -EBADF;
+ struct fd f = fdgetr_raw(fd, CAP_FSTAT);
+ int error;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
error = vfs_getattr(&f.file->f_path, stat);
fdput(f);
+ } else {
+ error = PTR_ERR(f.file);
}
return error;
}
@@ -103,7 +105,7 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
if (flag & AT_EMPTY_PATH)
lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
+ error = user_path_atr(dfd, filename, lookup_flags, &path, CAP_FSTAT);
if (error)
goto out;

diff --git a/fs/statfs.c b/fs/statfs.c
index 083dc0ac9140..f1b60bf1d14c 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -94,11 +94,13 @@ retry:

int fd_statfs(int fd, struct kstatfs *st)
{
- struct fd f = fdget_raw(fd);
- int error = -EBADF;
- if (f.file) {
+ struct fd f = fdgetr_raw(fd, CAP_FSTATFS);
+ int error;
+ if (!IS_ERR(f.file)) {
error = vfs_statfs(&f.file->f_path, st);
fdput(f);
+ } else {
+ error = PTR_ERR(f.file);
}
return error;
}
diff --git a/fs/sync.c b/fs/sync.c
index b28d1dd10e8b..663afe812600 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -148,12 +148,12 @@ void emergency_sync(void)
*/
SYSCALL_DEFINE1(syncfs, int, fd)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_FSYNC);
struct super_block *sb;
int ret;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
sb = f.file->f_dentry->d_sb;

down_read(&sb->s_umount);
@@ -199,12 +199,14 @@ EXPORT_SYMBOL(vfs_fsync);

static int do_fsync(unsigned int fd, int datasync)
{
- struct fd f = fdget(fd);
- int ret = -EBADF;
+ struct fd f = fdgetr(fd, CAP_FSYNC);
+ int ret;

- if (f.file) {
+ if (!IS_ERR(f.file)) {
ret = vfs_fsync(f.file, datasync);
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}
return ret;
}
@@ -310,10 +312,11 @@ SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
else
endbyte--; /* inclusive */

- ret = -EBADF;
- f = fdget(fd);
- if (!f.file)
+ f = fdgetr(fd, CAP_FSYNC, CAP_SEEK);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
+ }

i_mode = file_inode(f.file)->i_mode;
ret = -ESPIPE;
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 0013142c0475..daf04417e2cf 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -291,6 +291,32 @@ static const struct file_operations timerfd_fops = {
.llseek = noop_llseek,
};

+#ifdef CONFIG_SECURITY_CAPSICUM
+#define timerfd_fgetr(f, p, ...) \
+ _timerfd_fgetr((f), (p), __VA_ARGS__, 0ULL)
+static int _timerfd_fgetr(int fd, struct fd *p, ...)
+{
+ struct capsicum_rights rights;
+ struct fd f;
+ va_list ap;
+
+ va_start(ap, p);
+ f = fdget_rights(fd, cap_rights_vinit(&rights, ap));
+ va_end(ap);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
+ if (f.file->f_op != &timerfd_fops) {
+ fdput(f);
+ return -EINVAL;
+ }
+ *p = f;
+ return 0;
+}
+
+#else
+
+#define timerfd_fgetr(f, p, ...) \
+ timerfd_fget((f), (p))
static int timerfd_fget(int fd, struct fd *p)
{
struct fd f = fdget(fd);
@@ -304,6 +330,8 @@ static int timerfd_fget(int fd, struct fd *p)
return 0;
}

+#endif
+
SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
{
int ufd;
@@ -359,7 +387,7 @@ static int do_timerfd_settime(int ufd, int flags,
!timespec_valid(&new->it_interval))
return -EINVAL;

- ret = timerfd_fget(ufd, &f);
+ ret = timerfd_fgetr(ufd, &f, CAP_WRITE, (old ? CAP_READ : 0));
if (ret)
return ret;
ctx = f.file->private_data;
@@ -397,8 +425,10 @@ static int do_timerfd_settime(int ufd, int flags,
hrtimer_forward_now(&ctx->t.tmr, ctx->tintv);
}

- old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
- old->it_interval = ktime_to_timespec(ctx->tintv);
+ if (old) {
+ old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+ old->it_interval = ktime_to_timespec(ctx->tintv);
+ }

/*
* Re-program the timer to the new value ...
@@ -414,7 +444,7 @@ static int do_timerfd_gettime(int ufd, struct itimerspec *t)
{
struct fd f;
struct timerfd_ctx *ctx;
- int ret = timerfd_fget(ufd, &f);
+ int ret = timerfd_fgetr(ufd, &f, CAP_READ);
if (ret)
return ret;
ctx = f.file->private_data;
@@ -451,7 +481,7 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,

if (copy_from_user(&new, utmr, sizeof(new)))
return -EFAULT;
- ret = do_timerfd_settime(ufd, flags, &new, &old);
+ ret = do_timerfd_settime(ufd, flags, &new, otmr ? &old : NULL);
if (ret)
return ret;
if (otmr && copy_to_user(otmr, &old, sizeof(old)))
diff --git a/fs/utimes.c b/fs/utimes.c
index aa138d64560a..1d451efd6ae2 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -152,10 +152,11 @@ long do_utimes(int dfd, const char __user *filename, struct timespec *times,
if (flags & AT_SYMLINK_NOFOLLOW)
goto out;

- f = fdget(dfd);
- error = -EBADF;
- if (!f.file)
+ f = fdgetr(dfd, CAP_FUTIMES);
+ if (IS_ERR(f.file)) {
+ error = PTR_ERR(f.file);
goto out;
+ }

error = utimes_common(&f.file->f_path, times);
fdput(f);
@@ -166,7 +167,8 @@ long do_utimes(int dfd, const char __user *filename, struct timespec *times,
if (!(flags & AT_SYMLINK_NOFOLLOW))
lookup_flags |= LOOKUP_FOLLOW;
retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
+ error = user_path_atr(dfd, filename, lookup_flags, &path,
+ CAP_FUTIMESAT);
if (error)
goto out;

diff --git a/fs/xattr.c b/fs/xattr.c
index 3377dff18404..3013dc4cbf27 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -415,12 +415,12 @@ retry:
SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
const void __user *,value, size_t, size, int, flags)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_EXTATTR_SET);
struct dentry *dentry;
- int error = -EBADF;
+ int error;

- if (!f.file)
- return error;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
dentry = f.file->f_path.dentry;
audit_inode(NULL, dentry, 0);
error = mnt_want_write_file(f.file);
@@ -522,11 +522,11 @@ retry:
SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
void __user *, value, size_t, size)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_EXTATTR_GET);
ssize_t error = -EBADF;

- if (!f.file)
- return error;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
audit_inode(NULL, f.file->f_path.dentry, 0);
error = getxattr(f.file->f_path.dentry, name, value, size);
fdput(f);
@@ -611,11 +611,11 @@ retry:

SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_EXTATTR_LIST);
ssize_t error = -EBADF;

- if (!f.file)
- return error;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
audit_inode(NULL, f.file->f_path.dentry, 0);
error = listxattr(f.file->f_path.dentry, list, size);
fdput(f);
@@ -688,12 +688,12 @@ retry:

SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_EXTATTR_DELETE);
struct dentry *dentry;
int error = -EBADF;

- if (!f.file)
- return error;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
dentry = f.file->f_path.dentry;
audit_inode(NULL, dentry, 0);
error = mnt_want_write_file(f.file);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 0b18776b075e..a034c21be2a0 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -76,9 +76,9 @@ xfs_find_handle(
struct xfs_inode *ip;

if (cmd == XFS_IOC_FD_TO_HANDLE) {
- f = fdget(hreq->fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(hreq->fd, CAP_FSTAT);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
inode = file_inode(f.file);
} else {
error = user_lpath((const char __user *)hreq->path, &path);
@@ -1449,8 +1449,8 @@ xfs_ioc_swapext(
int error = 0;

/* Pull information for the target fd */
- f = fdget((int)sxp->sx_fdtarget);
- if (!f.file) {
+ f = fdgetr((int)sxp->sx_fdtarget, CAP_READ, CAP_WRITE, CAP_FSTAT);
+ if (IS_ERR(f.file)) {
error = XFS_ERROR(EINVAL);
goto out;
}
@@ -1462,8 +1462,8 @@ xfs_ioc_swapext(
goto out_put_file;
}

- tmp = fdget((int)sxp->sx_fdtmp);
- if (!tmp.file) {
+ tmp = fdgetr((int)sxp->sx_fdtmp, CAP_READ, CAP_WRITE, CAP_FSTAT);
+ if (IS_ERR(tmp.file)) {
error = XFS_ERROR(EINVAL);
goto out_put_file;
}
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 4fcf39af1776..f38639676b00 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -978,9 +978,9 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,

audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL);

- f = fdget(mqdes);
- if (unlikely(!f.file)) {
- ret = -EBADF;
+ f = fdgetr(mqdes, CAP_WRITE);
+ if (unlikely(IS_ERR(f.file))) {
+ ret = PTR_ERR(f.file);
goto out;
}

@@ -1094,9 +1094,9 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,

audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL);

- f = fdget(mqdes);
- if (unlikely(!f.file)) {
- ret = -EBADF;
+ f = fdgetr(mqdes, CAP_READ);
+ if (unlikely(IS_ERR(f.file))) {
+ ret = PTR_ERR(f.file);
goto out;
}

@@ -1229,9 +1229,9 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
skb_put(nc, NOTIFY_COOKIE_LEN);
/* and attach it to the socket */
retry:
- f = fdget(notification.sigev_signo);
- if (!f.file) {
- ret = -EBADF;
+ f = fdgetr(notification.sigev_signo, CAP_POLL_EVENT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
}
sock = netlink_getsockbyfilp(f.file);
@@ -1254,9 +1254,9 @@ retry:
}
}

- f = fdget(mqdes);
- if (!f.file) {
- ret = -EBADF;
+ f = fdgetr(mqdes, CAP_POLL_EVENT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
}

@@ -1328,9 +1328,9 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
return -EINVAL;
}

- f = fdget(mqdes);
- if (!f.file) {
- ret = -EBADF;
+ f = fdgetr(mqdes, CAP_POLL_EVENT);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
}

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 440eefc67397..43aa1a2cbc84 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -601,11 +601,11 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
{
struct perf_cgroup *cgrp;
struct cgroup_subsys_state *css;
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_FSTAT);
int ret = 0;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

css = css_tryget_from_dir(f.file->f_dentry, &perf_event_cgrp_subsys);
if (IS_ERR(css)) {
@@ -3598,9 +3598,9 @@ static const struct file_operations perf_fops;

static inline int perf_fget_light(int fd, struct fd *p)
{
- struct fd f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ struct fd f = fdgetr(fd, CAP_WRITE);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

if (f.file->f_op != &perf_fops) {
fdput(f);
@@ -3651,7 +3651,7 @@ static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
int ret;
if (arg != -1) {
struct perf_event *output_event;
- struct fd output;
+ struct fd output = { .file = NULL };
ret = perf_fget_light(arg, &output);
if (ret)
return ret;
diff --git a/kernel/module.c b/kernel/module.c
index 079c4615607d..6a0a1a28d34a 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2513,14 +2513,18 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
/* Sets info->hdr and info->len. */
static int copy_module_from_fd(int fd, struct load_info *info)
{
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_FEXECVE);
int err;
struct kstat stat;
loff_t pos;
ssize_t bytes = 0;

- if (!f.file)
- return -ENOEXEC;
+ if (IS_ERR(f.file)) {
+ err = PTR_ERR(f.file);
+ if (err == -EBADF)
+ err = -ENOEXEC;
+ return err;
+ }

err = security_kernel_module_from_file(f.file);
if (err)
diff --git a/kernel/sys.c b/kernel/sys.c
index fba0f29401ea..e158bce22c6b 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1634,9 +1634,9 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
struct inode *inode;
int err;

- exe = fdget(fd);
- if (!exe.file)
- return -EBADF;
+ exe = fdgetr(fd, CAP_FEXECVE);
+ if (IS_ERR(exe.file))
+ return PTR_ERR(exe.file);

inode = file_inode(exe.file);

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 13d2f7cd65db..1ad5fd005334 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -437,8 +437,8 @@ static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
return -EINVAL;

fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
- f = fdget(fd);
- if (!f.file)
+ f = fdgetr(fd, CAP_FSTAT);
+ if (IS_ERR(f.file))
return 0;

size = nla_total_size(sizeof(struct cgroupstats));
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index ce033c7aa2e8..0766473c77ea 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -246,13 +246,18 @@ struct posix_clock_desc {
struct posix_clock *clk;
};

-static int get_clock_desc(const clockid_t id, struct posix_clock_desc *cd)
+static int get_clock_desc(const clockid_t id, struct posix_clock_desc *cd,
+ u64 right)
{
- struct file *fp = fget(CLOCKID_TO_FD(id));
+ struct file *fp = fgetr(CLOCKID_TO_FD(id), right);
int err = -EINVAL;

- if (!fp)
+ if (IS_ERR(fp)) {
+ err = PTR_ERR(fp);
+ if (err == -EBADF)
+ err = -EINVAL;
return err;
+ }

if (fp->f_op->open != posix_clock_open || !fp->private_data)
goto out;
@@ -278,7 +283,7 @@ static int pc_clock_adjtime(clockid_t id, struct timex *tx)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_WRITE);
if (err)
return err;

@@ -302,7 +307,7 @@ static int pc_clock_gettime(clockid_t id, struct timespec *ts)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_READ);
if (err)
return err;

@@ -321,7 +326,7 @@ static int pc_clock_getres(clockid_t id, struct timespec *ts)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_READ);
if (err)
return err;

@@ -340,7 +345,7 @@ static int pc_clock_settime(clockid_t id, const struct timespec *ts)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_WRITE);
if (err)
return err;

@@ -365,7 +370,7 @@ static int pc_timer_create(struct k_itimer *kit)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_WRITE);
if (err)
return err;

@@ -385,7 +390,7 @@ static int pc_timer_delete(struct k_itimer *kit)
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_WRITE);
if (err)
return err;

@@ -404,7 +409,7 @@ static void pc_timer_gettime(struct k_itimer *kit, struct itimerspec *ts)
clockid_t id = kit->it_clock;
struct posix_clock_desc cd;

- if (get_clock_desc(id, &cd))
+ if (get_clock_desc(id, &cd, CAP_READ))
return;

if (cd.clk->ops.timer_gettime)
@@ -420,7 +425,7 @@ static int pc_timer_settime(struct k_itimer *kit, int flags,
struct posix_clock_desc cd;
int err;

- err = get_clock_desc(id, &cd);
+ err = get_clock_desc(id, &cd, CAP_WRITE);
if (err)
return err;

diff --git a/mm/fadvise.c b/mm/fadvise.c
index 3bcfd81db45e..69d51a43dc56 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -27,7 +27,7 @@
*/
SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
{
- struct fd f = fdget(fd);
+ struct fd f;
struct address_space *mapping;
struct backing_dev_info *bdi;
loff_t endbyte; /* inclusive */
@@ -36,8 +36,9 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
unsigned long nrpages;
int ret = 0;

- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_LIST_END);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

if (S_ISFIFO(file_inode(f.file)->i_mode)) {
ret = -ESPIPE;
diff --git a/mm/internal.h b/mm/internal.h
index 07b67361a40a..fc58791021af 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -13,6 +13,8 @@

#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/capsicum.h>

void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
@@ -91,6 +93,23 @@ static inline void get_page_foll(struct page *page)
}
}

+static inline struct capsicum_rights *
+mmap_rights(struct capsicum_rights *rights,
+ unsigned long prot,
+ unsigned long flags)
+{
+#ifdef CONFIG_SECURITY_CAPSICUM
+ cap_rights_init(rights, CAP_MMAP);
+ if (prot & PROT_READ)
+ cap_rights_set(rights, CAP_MMAP_R);
+ if ((flags & MAP_SHARED) && (prot & PROT_WRITE))
+ cap_rights_set(rights, CAP_MMAP_W);
+ if (prot & PROT_EXEC)
+ cap_rights_set(rights, CAP_MMAP_X);
+#endif
+ return rights;
+}
+
extern unsigned long highest_memmap_pfn;

/*
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5177c6d4a2dd..b113301b5b2b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6000,9 +6000,9 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
init_waitqueue_func_entry(&event->wait, memcg_event_wake);
INIT_WORK(&event->remove, memcg_event_remove);

- efile = fdget(efd);
- if (!efile.file) {
- ret = -EBADF;
+ efile = fdgetr(efd, CAP_WRITE);
+ if (IS_ERR(efile.file)) {
+ ret = PTR_ERR(efile.file);
goto out_kfree;
}

@@ -6012,9 +6012,9 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
goto out_put_efile;
}

- cfile = fdget(cfd);
- if (!cfile.file) {
- ret = -EBADF;
+ cfile = fdgetr(cfd, CAP_READ);
+ if (IS_ERR(cfile.file)) {
+ ret = PTR_ERR(cfile.file);
goto out_put_eventfd;
}

diff --git a/mm/mmap.c b/mm/mmap.c
index b1202cf81f4b..b347a2c5984c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1379,10 +1379,13 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
unsigned long retval = -EBADF;

if (!(flags & MAP_ANONYMOUS)) {
+ struct capsicum_rights rights;
audit_mmap_fd(fd, flags);
- file = fget(fd);
- if (!file)
+ file = fget_rights(fd, mmap_rights(&rights, prot, flags));
+ if (IS_ERR(file)) {
+ retval = PTR_ERR(file);
goto out;
+ }
if (is_file_hugepages(file))
len = ALIGN(len, huge_page_size(hstate_file(file)));
retval = -EINVAL;
diff --git a/mm/nommu.c b/mm/nommu.c
index 85f8d6698d48..a2d03530a8c4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1493,13 +1493,16 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
unsigned long, fd, unsigned long, pgoff)
{
struct file *file = NULL;
- unsigned long retval = -EBADF;
+ unsigned long retval;

audit_mmap_fd(fd, flags);
if (!(flags & MAP_ANONYMOUS)) {
- file = fget(fd);
- if (!file)
+ struct capsicum_rights rights;
+ file = fget_rights(fd, mmap_rights(&rights, prot, flags));
+ if (IS_ERR(file)) {
+ retval = PTR_ERR(file);
goto out;
+ }
}

flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
diff --git a/mm/readahead.c b/mm/readahead.c
index 0ca36a7770b1..781125653dcf 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -566,8 +566,8 @@ SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
struct fd f;

ret = -EBADF;
- f = fdget(fd);
- if (f.file) {
+ f = fdgetr(fd, CAP_PREAD);
+ if (!IS_ERR(f.file)) {
if (f.file->f_mode & FMODE_READ) {
struct address_space *mapping = f.file->f_mapping;
pgoff_t start = offset >> PAGE_CACHE_SHIFT;
@@ -576,6 +576,8 @@ SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
ret = do_readahead(mapping, f.file, start, len);
}
fdput(f);
+ } else {
+ ret = PTR_ERR(f.file);
}
return ret;
}
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 80d08f6664cb..6d0866ac873d 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -789,12 +789,12 @@ static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
if (!ts)
return -ENOMEM;

- ts->rd = fget(rfd);
- ts->wr = fget(wfd);
- if (!ts->rd || !ts->wr) {
- if (ts->rd)
+ ts->rd = fgetr(rfd, CAP_READ, CAP_POLL_EVENT);
+ ts->wr = fgetr(wfd, CAP_WRITE, CAP_POLL_EVENT);
+ if (IS_ERR(ts->rd) || IS_ERR(ts->wr)) {
+ if (!IS_ERR(ts->rd))
fput(ts->rd);
- if (ts->wr)
+ if (!IS_ERR(ts->wr))
fput(ts->wr);
kfree(ts);
return -EIO;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index b653ab001fba..8bd3eb38f260 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1611,10 +1611,14 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream1;
struct snd_pcm_group *group;
- struct fd f = fdget(fd);
+ struct fd f = fdgetr(fd, CAP_LIST_END);

- if (!f.file)
- return -EBADFD;
+ if (IS_ERR(f.file)) {
+ res = PTR_ERR(f.file);
+ if (res == -EBADF)
+ return -EBADFD;
+ return res;
+ }
if (!is_pcm_file(f.file)) {
res = -EBADFD;
goto _badf;
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 29c2a04e036e..75c101677edd 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -306,9 +306,9 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
INIT_WORK(&irqfd->inject, irqfd_inject);
INIT_WORK(&irqfd->shutdown, irqfd_shutdown);

- f = fdget(args->fd);
- if (!f.file) {
- ret = -EBADF;
+ f = fdgetr(args->fd, CAP_WRITE);
+ if (IS_ERR(f.file)) {
+ ret = PTR_ERR(f.file);
goto out;
}

diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ba1a93f935c7..1f427fafa03b 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -124,9 +124,9 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
if (get_user(fd, argp))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_FSTAT);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

vfio_group = kvm_vfio_group_get_external_user(f.file);
fdput(f);
@@ -164,9 +164,9 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
if (get_user(fd, argp))
return -EFAULT;

- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdgetr(fd, CAP_FSTAT);
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);

vfio_group = kvm_vfio_group_get_external_user(f.file);
fdput(f);
--
2.0.0.526.g5318336


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