Oleg Nesterov 35cc70fc58 exec: make argv/envp memory visible to oom-killer ... commit 3c77f84572 upstream. Brad Spengler published a local memory-allocation DoS that evades the OOM-killer (though not the virtual memory RLIMIT): http://www.grsecurity.net/~spender/64bit_dos.c execve()->copy_strings() can allocate a lot of memory, but this is not visible to oom-killer, nobody can see the nascent bprm->mm and take it into account. With this patch get_arg_page() increments current's MM_ANONPAGES counter every time we allocate the new page for argv/envp. When do_execve() succeds or fails, we change this counter back. Technically this is not 100% correct, we can't know if the new page is swapped out and turn MM_ANONPAGES into MM_SWAPENTS, but I don't think this really matters and everything becomes correct once exec changes ->mm or fails. Reported-by: Brad Spengler <spender@grsecurity.net> Reviewed-and-discussed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-12-09 13:32:57 -08:00
..
acpi	ACPI: Fix typos	2010-09-28 21:38:19 -04:00
asm-generic	gpio: doc updates	2010-09-09 18:57:24 -07:00
crypto
drm	drm/ttm: Fix two race conditions + fix busy codepaths	2010-10-06 09:04:43 +10:00
keys
linux	exec: make argv/envp memory visible to oom-killer	2010-12-09 13:32:57 -08:00
math-emu
media	V4L/DVB: videobuf-dma-sg: set correct size in last sg element	2010-09-27 22:22:01 -03:00
mtd	mtd: Update copyright notices	2010-08-08 20:58:20 +01:00
net	mac80211: clear txflags for ps-filtered frames	2010-12-09 13:32:12 -08:00
pcmcia
rdma
rxrpc
scsi	scsi: use __uX types for headers exported to user space	2010-08-11 08:59:01 -07:00
sound	ALSA: emu10k1 - delay the PCM interrupts (add pcm_irq_delay parameter)	2010-08-18 15:10:59 +02:00
trace	Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-08-24 12:21:49 -07:00
video	include: replace unifdef-y with header-y	2010-08-14 22:26:51 +02:00
xen	xen: pvhvm: make it clearer that XEN_UNPLUG_* define bits in a bitfield	2010-08-23 12:01:35 +01:00
Kbuild