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Subject[PATCH 9/15] sanitize audit_fd_pair()
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* no allocations
* return void

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/pipe.c | 7 +------
include/linux/audit.h | 9 ++++-----
kernel/auditsc.c | 44 ++++++++++++++------------------------------
net/socket.c | 9 +--------
4 files changed, 20 insertions(+), 49 deletions(-)
diff --git a/fs/pipe.c b/fs/pipe.c
index 7aea8b8..5341421 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1016,10 +1016,7 @@ int do_pipe_flags(int *fd, int flags)
goto err_fdr;
fdw = error;

- error = audit_fd_pair(fdr, fdw);
- if (error < 0)
- goto err_fdw;
-
+ audit_fd_pair(fdr, fdw);
fd_install(fdr, fr);
fd_install(fdw, fw);
fd[0] = fdr;
@@ -1027,8 +1024,6 @@ int do_pipe_flags(int *fd, int flags)

return 0;

- err_fdw:
- put_unused_fd(fdw);
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
diff --git a/include/linux/audit.h b/include/linux/audit.h
index ed6bdfc..c5e95e7 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -446,7 +446,7 @@ extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mod
extern int audit_bprm(struct linux_binprm *bprm);
extern void audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
-extern int __audit_fd_pair(int fd1, int fd2);
+extern void __audit_fd_pair(int fd1, int fd2);
extern int audit_set_macxattr(const char *name);
extern void __audit_mq_open(int oflag, mode_t mode, struct mq_attr *attr);
extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
@@ -458,11 +458,10 @@ static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
if (unlikely(!audit_dummy_context()))
__audit_ipc_obj(ipcp);
}
-static inline int audit_fd_pair(int fd1, int fd2)
+static inline void audit_fd_pair(int fd1, int fd2)
{
if (unlikely(!audit_dummy_context()))
- return __audit_fd_pair(fd1, fd2);
- return 0;
+ __audit_fd_pair(fd1, fd2);
}
static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
{
@@ -513,7 +512,7 @@ extern int audit_signals;
#define audit_ipc_set_perm(q,u,g,m) ((void)0)
#define audit_bprm(p) ({ 0; })
#define audit_socketcall(n,a) ((void)0)
-#define audit_fd_pair(n,a) ({ 0; })
+#define audit_fd_pair(n,a) ((void)0)
#define audit_sockaddr(len, addr) ({ 0; })
#define audit_set_macxattr(n) do { ; } while (0)
#define audit_mq_open(o,m,a) ((void)0)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index ac89cd3..5de0087 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -119,11 +119,6 @@ struct audit_aux_data_execve {
struct mm_struct *mm;
};

-struct audit_aux_data_fd_pair {
- struct audit_aux_data d;
- int fd[2];
-};
-
struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
@@ -215,6 +210,7 @@ struct audit_context {
struct mq_attr attr;
} mq_open;
};
+ int fds[2];

#if AUDIT_DEBUG
int put_count;
@@ -1321,11 +1317,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_execve_info(context, &ab, axi);
break; }

- case AUDIT_FD_PAIR: {
- struct audit_aux_data_fd_pair *axs = (void *)aux;
- audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
- break; }
-
}
audit_log_end(ab);
}
@@ -1333,6 +1324,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
if (context->type)
show_special(context, &call_panic);

+ if (context->fds[0] >= 0) {
+ ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
+ if (ab) {
+ audit_log_format(ab, "fd0=%d fd1=%d",
+ context->fds[0], context->fds[1]);
+ audit_log_end(ab);
+ }
+ }
+
if (context->sockaddr_len) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
if (ab) {
@@ -1611,6 +1611,7 @@ void audit_syscall_exit(int valid, long return_code)
context->target_sid = 0;
context->sockaddr_len = 0;
context->type = 0;
+ context->fds[0] = -1;
kfree(context->filterkey);
context->filterkey = NULL;
tsk->audit_context = context;
@@ -2177,29 +2178,12 @@ void audit_socketcall(int nargs, unsigned long *args)
* @fd1: the first file descriptor
* @fd2: the second file descriptor
*
- * Returns 0 for success or NULL context or < 0 on error.
*/
-int __audit_fd_pair(int fd1, int fd2)
+void __audit_fd_pair(int fd1, int fd2)
{
struct audit_context *context = current->audit_context;
- struct audit_aux_data_fd_pair *ax;
-
- if (likely(!context)) {
- return 0;
- }
-
- ax = kmalloc(sizeof(*ax), GFP_KERNEL);
- if (!ax) {
- return -ENOMEM;
- }
-
- ax->fd[0] = fd1;
- ax->fd[1] = fd2;
-
- ax->d.type = AUDIT_FD_PAIR;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- return 0;
+ context->fds[0] = fd1;
+ context->fds[1] = fd2;
}

/**
diff --git a/net/socket.c b/net/socket.c
index aba5a50..a383608 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1314,13 +1314,7 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
goto out_fd1;
}

- err = audit_fd_pair(fd1, fd2);
- if (err < 0) {
- fput(newfile1);
- fput(newfile2);
- goto out_fd;
- }
-
+ audit_fd_pair(fd1, fd2);
fd_install(fd1, newfile1);
fd_install(fd2, newfile2);
/* fd1 and fd2 may be already another descriptors.
@@ -1350,7 +1344,6 @@ out_fd2:
out_fd1:
put_filp(newfile2);
sock_release(sock2);
-out_fd:
put_unused_fd(fd1);
put_unused_fd(fd2);
goto out;
--
1.5.6.5



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