BACKPORT: aio: mark AIO pseudo-fs noexec

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) {
        personality(READ_IMPLIES_EXEC);
        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]'",
            (int)getpid());
        system(cmd);
        return 0;
    }

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

Signed-off-by: Jann Horn <jann@thejh.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 22f6b4d34fcf039c63a94e7670e0da24f8575a5a)

Bug: 31711619
Change-Id: I9f2872703bef240d6b82320c744529459bb076dc

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/aio.c b/fs/aio.c
index 57a560d..c1c5d59 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -35,6 +35,7 @@
 #include <linux/eventfd.h>
 #include <linux/blkdev.h>
 #include <linux/compat.h>
+#include <linux/personality.h>
 
 #include <asm/kmap_types.h>
 #include <asm/uaccess.h>
@@ -112,6 +113,9 @@ static int aio_setup_ring(struct kioctx *ctx)
 	unsigned long size;
 	int nr_pages;
 
+	if (current->personality & READ_IMPLIES_EXEC)
+		return -EPERM;
+
 	/* Compensate for the ring buffer's head/tail overlap entry */
 	nr_events += 2;	/* 1 is required, 2 for good luck */