[PATCH 4.7 132/141] aio: mark AIO pseudo-fs noexec

From: Greg Kroah-Hartman
Date: Thu Oct 06 2016 - 04:50:32 EST

4.7-stable review patch. If anyone has any objections, please let me know.


From: Jann Horn <jann@xxxxxxxxx>

commit 22f6b4d34fcf039c63a94e7670e0da24f8575a5a upstream.

This ensures that do_mmap() won't implicitly make AIO memory mappings
executable if the READ_IMPLIES_EXEC personality flag is set. Such
behavior is problematic because the security_mmap_file LSM hook doesn't
catch this case, potentially permitting an attacker to bypass a W^X
policy enforced by SELinux.

I have tested the patch on my machine.

To test the behavior, compile and run this:

#define _GNU_SOURCE
#include <unistd.h>
#include <sys/personality.h>
#include <linux/aio_abi.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/syscall.h>

int main(void) {
aio_context_t ctx = 0;
if (syscall(__NR_io_setup, 1, &ctx))
err(1, "io_setup");

char cmd[1000];
sprintf(cmd, "cat /proc/%d/maps | grep -F '/[aio]'",
return 0;

In the output, "rw-s" is good, "rwxs" is bad.

Signed-off-by: Jann Horn <jann@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/aio.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/aio.c
+++ b/fs/aio.c
@@ -239,7 +239,12 @@ static struct dentry *aio_mount(struct f
static const struct dentry_operations ops = {
.d_dname = simple_dname,
- return mount_pseudo(fs_type, "aio:", NULL, &ops, AIO_RING_MAGIC);
+ struct dentry *root = mount_pseudo(fs_type, "aio:", NULL, &ops,
+ if (!IS_ERR(root))
+ root->d_sb->s_iflags |= SB_I_NOEXEC;
+ return root;

/* aio_setup