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Date: Fri, 25 Mar 2011 17:03:52 -0700 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org Cc: stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Kees Cook <kees.cook@...onical.com>, Alexey Dobriyan <adobriyan@...il.com>, David Howells <dhowells@...hat.com>, Eugene Teo <eugeneteo@...nel.sg>, Martin Schwidefsky <schwidefsky@...ibm.com>, Brad Spengler <spender@...ecurity.net> Subject: [20/35] proc: protect mm start_code/end_code in /proc/pid/stat 2.6.33-longterm review patch. If anyone has any objections, please let us know. ------------------ From: Kees Cook <kees.cook@...onical.com> 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@...onical.com> Cc: Alexey Dobriyan <adobriyan@...il.com> Cc: David Howells <dhowells@...hat.com> Cc: Eugene Teo <eugeneteo@...nel.sg> Cc: Martin Schwidefsky <schwidefsky@...ibm.com> Cc: Brad Spengler <spender@...ecurity.net> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- fs/proc/array.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -488,8 +488,8 @@ static int do_task_stat(struct seq_file 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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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