diff options
| author | Kees Cook <kees.cook@canonical.com> | 2011-03-23 16:42:53 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2011-04-30 16:53:22 +0200 |
| commit | 233d858fcbd5e9a3d26e52baae3a30c4579c070d (patch) | |
| tree | dd52530451aed476eeabc67db102515542384793 | |
| parent | 9bc945920059c8bec8ba2e7f7aabba5135569a55 (diff) | |
proc: protect mm start_code/end_code in /proc/pid/stat
commit 5883f57ca0008ffc93e09cbb9847a1928e50c6f3 upstream.
While mm->start_stack was protected from cross-uid viewing (commit
f83ce3e6b02d5 ("proc: avoid information leaks to non-privileged
processes")), the start_code and end_code values were not. This would
allow the text location of a PIE binary to leak, defeating ASLR.
Note that the value "1" is used instead of "0" for a protected value since
"ps", "killall", and likely other readers of /proc/pid/stat, take
start_code of "0" to mean a kernel thread and will misbehave. Thanks to
Brad Spengler for pointing this out.
Addresses CVE-2011-0726
Signed-off-by: Kees Cook <kees.cook@canonical.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Eugene Teo <eugeneteo@kernel.sg>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/proc/array.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 7b7f6543559..4f6e323bf47 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -471,8 +471,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, vsize, mm ? get_mm_rss(mm) : 0, rsslim, - mm ? mm->start_code : 0, - mm ? mm->end_code : 0, + mm ? (permitted ? mm->start_code : 1) : 0, + mm ? (permitted ? mm->end_code : 1) : 0, (permitted && mm) ? mm->start_stack : 0, esp, eip, |