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Subject[PATCH 10/11] capsicum: invocation of new LSM hooks
Date
Places that call fcheck() to convert a file descriptor into a
struct file need to call the new .file_lookup LSM hook. The
most important instances of this are in the fget() function,
but there are a few other direct users of fcheck().

If a new file descriptor is created from an existing file
descriptor, then any rights associated with the original FD
need to be propagated to the new FD. The .file_install LSM
hook takes care of this, by potentially changing the struct
file that is about to be installed into the FD table. This
affects accept(2) and openat(2); for the latter, the rights
associated with the dfd need to be propagated through the
code in fs/namei.c to allow this.

The path walking code in fs/namei.c is also modified to enable
the O_BENEATH_ONLY flag if the process is in capability mode,
or if the dfd is a Capsicum capability.

Signed-off-by: David Drysdale <drysdale@google.com>
---
arch/powerpc/platforms/cell/spufs/coredump.c | 2 +
fs/file.c | 2 +-
fs/locks.c | 2 +
fs/namei.c | 217 ++++++++++++++++++++-------
fs/notify/dnotify/dnotify.c | 2 +
fs/proc/fd.c | 16 +-
net/socket.c | 10 +-
7 files changed, 192 insertions(+), 59 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c
index be6212ddbf06..589fad12c715 100644
--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -29,6 +29,7 @@
#include <linux/syscalls.h>
#include <linux/coredump.h>
#include <linux/binfmts.h>
+#include <linux/security.h>

#include <asm/uaccess.h>

@@ -101,6 +102,7 @@ static struct spu_context *coredump_next_context(int *fd)
return NULL;
*fd = n - 1;
file = fcheck(*fd);
+ file = security_file_lookup(file, NULL, NULL);
return SPUFS_I(file_inode(file))->i_ctx;
}

diff --git a/fs/file.c b/fs/file.c
index 562cc82ba442..5a784234fd3a 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -742,7 +742,7 @@ static struct file *unwrap_file(struct file *orig,
return ERR_PTR(-EBADF);
if (IS_ERR(orig))
return orig;
- f = orig; /* TODO: pass to an LSM hook here */
+ f = security_file_lookup(orig, required_rights, actual_rights);
if (f != orig && update_refcnt) {
/* We're not returning the original, and the calling code
* has already incremented the refcount on it, we need to
diff --git a/fs/locks.c b/fs/locks.c
index 375fac3392b9..fd95ced5ced1 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2121,6 +2121,7 @@ again:
*/
spin_lock(&current->files->file_lock);
f = fcheck(fd);
+ f = security_file_lookup(f, NULL, NULL);
spin_unlock(&current->files->file_lock);
if (!error && f != filp && flock.l_type != F_UNLCK) {
flock.l_type = F_UNLCK;
@@ -2255,6 +2256,7 @@ again:
*/
spin_lock(&current->files->file_lock);
f = fcheck(fd);
+ f = security_file_lookup(f, NULL, NULL);
spin_unlock(&current->files->file_lock);
if (!error && f != filp && flock.l_type != F_UNLCK) {
flock.l_type = F_UNLCK;
diff --git a/fs/namei.c b/fs/namei.c
index c93f7993960e..001baf46b7a5 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -34,6 +34,7 @@
#include <linux/device_cgroup.h>
#include <linux/fs_struct.h>
#include <linux/posix_acl.h>
+#include <linux/capsicum.h>
#include <asm/uaccess.h>

#include "internal.h"
@@ -1750,7 +1751,7 @@ static int link_path_walk(const char *name, struct nameidata *nd,
{
struct path next;
int err;
-
+
while (*name == '/') {
if (flags & LOOKUP_BENEATH_ONLY) {
err = -EACCES;
@@ -1836,15 +1837,18 @@ exit:
return err;
}

-static int path_init(int dfd, const char *name, unsigned int flags,
- struct nameidata *nd, struct file **fp)
+static int path_init(int dfd, const char *name, unsigned int *flags,
+ struct nameidata *nd, struct file **fp,
+ const struct capsicum_rights **dfd_rights,
+ const struct capsicum_rights *rights)
{
int retval = 0;

nd->last_type = LAST_ROOT; /* if there are only slashes... */
- nd->flags = flags | LOOKUP_JUMPED;
+ nd->flags = (*flags) | LOOKUP_PARENT | LOOKUP_JUMPED;
nd->depth = 0;
- if (flags & LOOKUP_ROOT) {
+
+ if ((*flags) & LOOKUP_ROOT) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
if (*name) {
@@ -1856,7 +1860,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
}
nd->path = nd->root;
nd->inode = inode;
- if (flags & LOOKUP_RCU) {
+ if ((*flags) & LOOKUP_RCU) {
rcu_read_lock();
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
nd->m_seq = read_seqbegin(&mount_lock);
@@ -1870,9 +1874,11 @@ static int path_init(int dfd, const char *name, unsigned int flags,

nd->m_seq = read_seqbegin(&mount_lock);
if (*name=='/') {
- if (flags & LOOKUP_BENEATH_ONLY)
+ if ((*flags) & LOOKUP_BENEATH_ONLY)
return -EACCES;
- if (flags & LOOKUP_RCU) {
+ if (dfd_rights)
+ *dfd_rights = NULL;
+ if ((*flags) & LOOKUP_RCU) {
rcu_read_lock();
set_root_rcu(nd);
} else {
@@ -1881,7 +1887,9 @@ static int path_init(int dfd, const char *name, unsigned int flags,
}
nd->path = nd->root;
} else if (dfd == AT_FDCWD) {
- if (flags & LOOKUP_RCU) {
+ if (dfd_rights)
+ *dfd_rights = NULL;
+ if ((*flags) & LOOKUP_RCU) {
struct fs_struct *fs = current->fs;
unsigned seq;

@@ -1897,11 +1905,13 @@ static int path_init(int dfd, const char *name, unsigned int flags,
}
} else {
/* Caller must check execute permissions on the starting path component */
- struct fd f = fdget_raw(dfd);
+ struct fd f = fdget_raw_rights(dfd, dfd_rights, rights);
struct dentry *dentry;

- if (!f.file)
- return -EBADF;
+ if (IS_ERR(f.file))
+ return PTR_ERR(f.file);
+ if (!cap_rights_is_all(*dfd_rights))
+ *flags |= LOOKUP_BENEATH_ONLY;

dentry = f.file->f_path.dentry;

@@ -1913,7 +1923,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
}

nd->path = f.file->f_path;
- if (flags & LOOKUP_RCU) {
+ if ((*flags) & LOOKUP_RCU) {
if (f.flags & FDPUT_FPUT)
*fp = f.file;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
@@ -1938,9 +1948,12 @@ static inline int lookup_last(struct nameidata *nd, struct path *path)
}

/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
-static int path_lookupat(int dfd, const char *name,
- unsigned int flags, struct nameidata *nd)
+static int path_lookupat(int dfd,
+ const char *name, unsigned int flags,
+ struct nameidata *nd,
+ const struct capsicum_rights *rights)
{
+ const struct capsicum_rights *dfd_rights;
struct file *base = NULL;
struct path path;
int err;
@@ -1959,7 +1972,7 @@ static int path_lookupat(int dfd, const char *name,
* be handled by restarting a traditional ref-walk (which will always
* be able to complete).
*/
- err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base);
+ err = path_init(dfd, name, &flags, nd, &base, &dfd_rights, rights);

if (unlikely(err))
return err;
@@ -2004,27 +2017,32 @@ static int path_lookupat(int dfd, const char *name,
return err;
}

-static int filename_lookup(int dfd, struct filename *name,
- unsigned int flags, struct nameidata *nd)
+static int filename_lookup(int dfd,
+ struct filename *name, unsigned int flags,
+ struct nameidata *nd,
+ const struct capsicum_rights *rights)
{
- int retval = path_lookupat(dfd, name->name, flags | LOOKUP_RCU, nd);
+ int retval = path_lookupat(dfd, name->name, flags | LOOKUP_RCU, nd,
+ rights);
if (unlikely(retval == -ECHILD))
- retval = path_lookupat(dfd, name->name, flags, nd);
+ retval = path_lookupat(dfd, name->name, flags, nd, rights);
if (unlikely(retval == -ESTALE))
- retval = path_lookupat(dfd, name->name,
- flags | LOOKUP_REVAL, nd);
+ retval = path_lookupat(dfd, name->name, flags | LOOKUP_REVAL,
+ nd, rights);

if (likely(!retval))
audit_inode(name, nd->path.dentry, flags & LOOKUP_PARENT);
return retval;
}

-static int do_path_lookup(int dfd, const char *name,
- unsigned int flags, struct nameidata *nd)
+static int do_path_lookup(int dfd,
+ const char *name, unsigned int flags,
+ struct nameidata *nd,
+ const struct capsicum_rights *rights)
{
struct filename filename = { .name = name };

- return filename_lookup(dfd, &filename, flags, nd);
+ return filename_lookup(dfd, &filename, flags, nd, rights);
}

/* does lookup, returns the object with parent locked */
@@ -2032,7 +2050,8 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
{
struct nameidata nd;
struct dentry *d;
- int err = do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, &nd);
+ int err;
+ err = do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, &nd, NULL);
if (err)
return ERR_PTR(err);
if (nd.last_type != LAST_NORM) {
@@ -2053,7 +2072,8 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
int kern_path(const char *name, unsigned int flags, struct path *path)
{
struct nameidata nd;
- int res = do_path_lookup(AT_FDCWD, name, flags, &nd);
+ int res;
+ res = do_path_lookup(AT_FDCWD, name, flags, &nd, NULL);
if (!res)
*path = nd.path;
return res;
@@ -2078,7 +2098,7 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
nd.root.mnt = mnt;
BUG_ON(flags & LOOKUP_PARENT);
/* the first argument of do_path_lookup() is ignored with LOOKUP_ROOT */
- err = do_path_lookup(AT_FDCWD, name, flags | LOOKUP_ROOT, &nd);
+ err = do_path_lookup(AT_FDCWD, name, flags | LOOKUP_ROOT, &nd, NULL);
if (!err)
*path = nd.path;
return err;
@@ -2161,8 +2181,7 @@ static int user_path_at_empty_rights(int dfd,
if (!IS_ERR(tmp)) {

BUG_ON(flags & LOOKUP_PARENT);
-
- err = filename_lookup(dfd, tmp, flags, &nd);
+ err = filename_lookup(dfd, tmp, flags, &nd, rights);
putname(tmp);
if (!err)
*path = nd.path;
@@ -2211,7 +2230,7 @@ int _user_path_atr(int dfd,
*/
static struct filename *
user_path_parent(int dfd, const char __user *path, struct nameidata *nd,
- unsigned int flags)
+ unsigned int flags, const struct capsicum_rights *rights)
{
struct filename *s = getname(path);
int error;
@@ -2222,7 +2241,7 @@ user_path_parent(int dfd, const char __user *path, struct nameidata *nd,
if (IS_ERR(s))
return s;

- error = filename_lookup(dfd, s, flags | LOOKUP_PARENT, nd);
+ error = filename_lookup(dfd, s, flags | LOOKUP_PARENT, nd, rights);
if (error) {
putname(s);
return ERR_PTR(error);
@@ -2338,9 +2357,11 @@ path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags
{
struct file *base = NULL;
struct nameidata nd;
+ const struct capsicum_rights *dfd_rights;
int err;

- err = path_init(dfd, name, flags | LOOKUP_PARENT, &nd, &base);
+ err = path_init(dfd, name, &flags, &nd, &base,
+ &dfd_rights, &lookup_rights);
if (unlikely(err))
return err;

@@ -3165,8 +3186,9 @@ static int do_tmpfile(int dfd, struct filename *pathname,
static const struct qstr name = QSTR_INIT("/", 1);
struct dentry *dentry, *child;
struct inode *dir;
- int error = path_lookupat(dfd, pathname->name,
- flags | LOOKUP_DIRECTORY, nd);
+ int error;
+ error = path_lookupat(dfd, pathname->name, flags | LOOKUP_DIRECTORY, nd,
+ &lookup_rights);
if (unlikely(error))
return error;
error = mnt_want_write(nd->path.mnt);
@@ -3218,15 +3240,42 @@ out:
return error;
}

+static void openat_primary_rights(struct capsicum_rights *rights,
+ unsigned int flags)
+{
+ switch (flags & O_ACCMODE) {
+ case O_RDONLY:
+ cap_rights_set(rights, CAP_READ);
+ break;
+ case O_RDWR:
+ cap_rights_set(rights, CAP_READ);
+ /* FALLTHRU */
+ case O_WRONLY:
+ cap_rights_set(rights, CAP_WRITE);
+ if (!(flags & (O_APPEND | O_TRUNC)))
+ cap_rights_set(rights, CAP_SEEK);
+ break;
+ }
+ if (flags & O_CREAT)
+ cap_rights_set(rights, CAP_CREATE);
+ if (flags & O_TRUNC)
+ cap_rights_set(rights, CAP_FTRUNCATE);
+ if (flags & (O_DSYNC|FASYNC))
+ cap_rights_set(rights, CAP_FSYNC);
+}
+
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
+ struct capsicum_rights rights;
+ const struct capsicum_rights *dfd_rights;
struct file *base = NULL;
struct file *file;
struct path path;
int opened = 0;
int error;

+ cap_rights_init(&rights, CAP_LOOKUP);
file = get_empty_filp();
if (IS_ERR(file))
return file;
@@ -3238,7 +3287,9 @@ static struct file *path_openat(int dfd, struct filename *pathname,
goto out;
}

- error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
+ openat_primary_rights(&rights, file->f_flags);
+ error = path_init(dfd, pathname->name, &flags, nd, &base,
+ &dfd_rights, &rights);
if (unlikely(error))
goto out;

@@ -3268,6 +3319,16 @@ static struct file *path_openat(int dfd, struct filename *pathname,
error = do_last(nd, &path, file, op, &opened, pathname);
put_link(nd, &link, cookie);
}
+ if (!error) {
+ struct file *install_file;
+ install_file = security_file_install(dfd_rights, file);
+ if (IS_ERR(install_file)) {
+ error = PTR_ERR(install_file);
+ goto out;
+ } else {
+ file = install_file;
+ }
+ }
out:
if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT))
path_put(&nd->root);
@@ -3326,8 +3387,12 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
return file;
}

-struct dentry *kern_path_create(int dfd, const char *pathname,
- struct path *path, unsigned int lookup_flags)
+static struct dentry *
+kern_path_create_rights(int dfd,
+ const char *pathname,
+ struct path *path,
+ unsigned int lookup_flags,
+ const struct capsicum_rights *rights)
{
struct dentry *dentry = ERR_PTR(-EEXIST);
struct nameidata nd;
@@ -3341,7 +3406,8 @@ struct dentry *kern_path_create(int dfd, const char *pathname,
*/
lookup_flags &= LOOKUP_REVAL;

- error = do_path_lookup(dfd, pathname, LOOKUP_PARENT|lookup_flags, &nd);
+ error = do_path_lookup(dfd, pathname, LOOKUP_PARENT|lookup_flags, &nd,
+ rights);
if (error)
return ERR_PTR(error);

@@ -3395,6 +3461,13 @@ out:
path_put(&nd.path);
return dentry;
}
+
+struct dentry *kern_path_create(int dfd, const char *pathname,
+ struct path *path, unsigned int lookup_flags)
+{
+ return kern_path_create_rights(dfd, pathname, path, lookup_flags,
+ &lookup_rights);
+}
EXPORT_SYMBOL(kern_path_create);

void done_path_create(struct path *path, struct dentry *dentry)
@@ -3406,17 +3479,29 @@ void done_path_create(struct path *path, struct dentry *dentry)
}
EXPORT_SYMBOL(done_path_create);

-struct dentry *user_path_create(int dfd, const char __user *pathname,
- struct path *path, unsigned int lookup_flags)
+static struct dentry *
+user_path_create_rights(int dfd,
+ const char __user *pathname,
+ struct path *path,
+ unsigned int lookup_flags,
+ const struct capsicum_rights *rights)
{
struct filename *tmp = getname(pathname);
struct dentry *res;
if (IS_ERR(tmp))
return ERR_CAST(tmp);
- res = kern_path_create(dfd, tmp->name, path, lookup_flags);
+ res = kern_path_create_rights(dfd, tmp->name, path, lookup_flags,
+ rights);
putname(tmp);
return res;
}
+
+struct dentry *user_path_create(int dfd, const char __user *pathname,
+ struct path *path, unsigned int lookup_flags)
+{
+ return user_path_create_rights(dfd, pathname, path, lookup_flags,
+ &lookup_rights);
+}
EXPORT_SYMBOL(user_path_create);

int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
@@ -3467,16 +3552,28 @@ static int may_mknod(umode_t mode)
SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
unsigned, dev)
{
+ struct capsicum_rights rights;
struct dentry *dentry;
struct path path;
int error;
unsigned int lookup_flags = 0;

+ cap_rights_init(&rights, CAP_LOOKUP);
error = may_mknod(mode);
if (error)
return error;
+
+ switch (mode & S_IFMT) {
+ case S_IFCHR: case S_IFBLK:
+ cap_rights_set(&rights, CAP_MKNODAT);
+ break;
+ case S_IFIFO:
+ cap_rights_set(&rights, CAP_MKFIFOAT);
+ break;
+ }
retry:
- dentry = user_path_create(dfd, filename, &path, lookup_flags);
+ dentry = user_path_create_rights(dfd, filename, &path, lookup_flags,
+ &rights);
if (IS_ERR(dentry))
return PTR_ERR(dentry);

@@ -3543,9 +3640,12 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
struct path path;
int error;
unsigned int lookup_flags = LOOKUP_DIRECTORY;
+ struct capsicum_rights rights;
+ cap_rights_init(&rights, CAP_LOOKUP, CAP_MKDIRAT);

retry:
- dentry = user_path_create(dfd, pathname, &path, lookup_flags);
+ dentry = user_path_create_rights(dfd, pathname, &path, lookup_flags,
+ &rights);
if (IS_ERR(dentry))
return PTR_ERR(dentry);

@@ -3636,9 +3736,11 @@ static long do_rmdir(int dfd, const char __user *pathname)
struct filename *name;
struct dentry *dentry;
struct nameidata nd;
+ struct capsicum_rights rights;
unsigned int lookup_flags = 0;
+ cap_rights_init(&rights, CAP_UNLINKAT);
retry:
- name = user_path_parent(dfd, pathname, &nd, lookup_flags);
+ name = user_path_parent(dfd, pathname, &nd, lookup_flags, &rights);
if (IS_ERR(name))
return PTR_ERR(name);

@@ -3763,8 +3865,10 @@ static long do_unlinkat(int dfd, const char __user *pathname)
struct inode *inode = NULL;
struct inode *delegated_inode = NULL;
unsigned int lookup_flags = 0;
+ struct capsicum_rights rights;
+ cap_rights_init(&rights, CAP_UNLINKAT);
retry:
- name = user_path_parent(dfd, pathname, &nd, lookup_flags);
+ name = user_path_parent(dfd, pathname, &nd, lookup_flags, &rights);
if (IS_ERR(name))
return PTR_ERR(name);

@@ -3870,12 +3974,15 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
struct dentry *dentry;
struct path path;
unsigned int lookup_flags = 0;
+ struct capsicum_rights rights;

from = getname(oldname);
if (IS_ERR(from))
return PTR_ERR(from);
+ cap_rights_init(&rights, CAP_SYMLINKAT);
retry:
- dentry = user_path_create(newdfd, newname, &path, lookup_flags);
+ dentry = user_path_create_rights(newdfd, newname, &path, lookup_flags,
+ &rights);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out_putname;
@@ -3986,6 +4093,7 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
struct dentry *new_dentry;
struct path old_path, new_path;
struct inode *delegated_inode = NULL;
+ struct capsicum_rights rights;
int how = 0;
int error;

@@ -4004,13 +4112,14 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,

if (flags & AT_SYMLINK_FOLLOW)
how |= LOOKUP_FOLLOW;
+ cap_rights_init(&rights, CAP_LINKAT);
retry:
error = user_path_at(olddfd, oldname, how, &old_path);
if (error)
return error;

- new_dentry = user_path_create(newdfd, newname, &new_path,
- (how & LOOKUP_REVAL));
+ new_dentry = user_path_create_rights(newdfd, newname, &new_path,
+ (how & LOOKUP_REVAL), &rights);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
goto out;
@@ -4241,6 +4350,8 @@ SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
struct inode *delegated_inode = NULL;
struct filename *from;
struct filename *to;
+ struct capsicum_rights old_rights;
+ struct capsicum_rights new_rights;
unsigned int lookup_flags = 0;
bool should_retry = false;
int error;
@@ -4251,14 +4362,18 @@ SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
if ((flags & RENAME_NOREPLACE) && (flags & RENAME_EXCHANGE))
return -EINVAL;

+ cap_rights_init(&old_rights, CAP_RENAMEAT);
+ cap_rights_init(&new_rights, CAP_LINKAT);
retry:
- from = user_path_parent(olddfd, oldname, &oldnd, lookup_flags);
+ from = user_path_parent(olddfd, oldname, &oldnd, lookup_flags,
+ &old_rights);
if (IS_ERR(from)) {
error = PTR_ERR(from);
goto exit;
}

- to = user_path_parent(newdfd, newname, &newnd, lookup_flags);
+ to = user_path_parent(newdfd, newname, &newnd, lookup_flags,
+ &new_rights);
if (IS_ERR(to)) {
error = PTR_ERR(to);
goto exit1;
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index abc8cbcfe90e..33a269166b05 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/fdtable.h>
#include <linux/fsnotify_backend.h>
+#include <linux/security.h>

int dir_notify_enable __read_mostly = 1;

@@ -327,6 +328,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)

rcu_read_lock();
f = fcheck(fd);
+ f = security_file_lookup(f, NULL, NULL);
rcu_read_unlock();

/* if (f != filp) means that we lost a race and another task/thread
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 0788d093f5d8..d260dd1acdee 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -20,6 +20,7 @@ static int seq_show(struct seq_file *m, void *v)
struct files_struct *files = NULL;
int f_flags = 0, ret = -ENOENT;
struct file *file = NULL;
+ struct file *underlying = NULL;
struct task_struct *task;

task = get_proc_task(m->private);
@@ -36,12 +37,13 @@ static int seq_show(struct seq_file *m, void *v)
file = fcheck_files(files, fd);
if (file) {
struct fdtable *fdt = files_fdtable(files);
-
- f_flags = file->f_flags;
+ underlying = security_file_lookup(file, NULL, NULL);
+ f_flags = underlying->f_flags;
if (close_on_exec(fd, fdt))
f_flags |= O_CLOEXEC;

get_file(file);
+ get_file(underlying);
ret = 0;
}
spin_unlock(&files->file_lock);
@@ -50,10 +52,11 @@ static int seq_show(struct seq_file *m, void *v)

if (!ret) {
seq_printf(m, "pos:\t%lli\nflags:\t0%o\nmnt_id:\t%i\n",
- (long long)file->f_pos, f_flags,
- real_mount(file->f_path.mnt)->mnt_id);
+ (long long)underlying->f_pos, f_flags,
+ real_mount(underlying->f_path.mnt)->mnt_id);
if (file->f_op->show_fdinfo)
ret = file->f_op->show_fdinfo(m, file);
+ fput(underlying);
fput(file);
}

@@ -95,7 +98,9 @@ static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
rcu_read_lock();
file = fcheck_files(files, fd);
if (file) {
- unsigned f_mode = file->f_mode;
+ unsigned f_mode;
+ file = security_file_lookup(file, NULL, NULL);
+ f_mode = file->f_mode;

rcu_read_unlock();
put_files_struct(files);
@@ -158,6 +163,7 @@ static int proc_fd_link(struct dentry *dentry, struct path *path)
spin_lock(&files->file_lock);
fd_file = fcheck_files(files, fd);
if (fd_file) {
+ fd_file = security_file_lookup(fd_file, NULL, NULL);
*path = fd_file->f_path;
path_get(&fd_file->f_path);
ret = 0;
diff --git a/net/socket.c b/net/socket.c
index dbc00f0b992a..f635dc3f9a3c 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1669,6 +1669,7 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
{
struct socket *sock, *newsock;
struct file *newfile;
+ struct file *installfile;
int err, len, newfd, fput_needed;
struct sockaddr_storage address;
struct capsicum_rights rights;
@@ -1736,7 +1737,12 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,

/* File flags are not inherited via accept() unlike another OSes. */

- fd_install(newfd, newfile);
+ installfile = security_file_install(listen_rights, newfile);
+ if (IS_ERR(installfile)) {
+ err = PTR_ERR(installfile);
+ goto out_fd;
+ }
+ fd_install(newfd, installfile);
err = newfd;

out_put:
@@ -2115,7 +2121,7 @@ static int ___sys_sendmsg(struct socket *sock_noaddr, struct socket *sock_addr,
}
sock = (msg_sys->msg_name ? sock_addr : sock_noaddr);
if (!sock)
- return -EBADF;
+ return -ENOTCAPABLE;

if (msg_sys->msg_iovlen > UIO_FASTIOV) {
err = -EMSGSIZE;
--
2.0.0.526.g5318336


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