This is a note to let you know that I've just added the patch titled
staging: android: ion: Bail out upon SIGKILL when allocating memory.
to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 8f9e86ee795971eabbf372e6d804d6b8578287a7 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Date: Mon, 1 Jul 2019 19:55:19 +0900 Subject: staging: android: ion: Bail out upon SIGKILL when allocating memory.
syzbot found that a thread can stall for minutes inside ion_system_heap_allocate() after that thread was killed by SIGKILL [1]. Let's check for SIGKILL before doing memory allocation.
[1] https://syzkaller.appspot.com/bug?id=a0e3436829698d5824231251fad9d8e998f94f5...
Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Cc: stable stable@vger.kernel.org Reported-by: syzbot syzbot+8ab2d0f39fb79fe6ca40@syzkaller.appspotmail.com Acked-by: Laura Abbott labbott@redhat.com Acked-by: Sumit Semwal sumit.semwal@linaro.org Link: https://lore.kernel.org/r/d088f188-5f32-d8fc-b9a0-0b404f7501cc@I-love.SAKURA... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/android/ion/ion_page_pool.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c index fd4995fb676e..f85ec5b16b65 100644 --- a/drivers/staging/android/ion/ion_page_pool.c +++ b/drivers/staging/android/ion/ion_page_pool.c @@ -8,11 +8,14 @@ #include <linux/list.h> #include <linux/slab.h> #include <linux/swap.h> +#include <linux/sched/signal.h>
#include "ion.h"
static inline struct page *ion_page_pool_alloc_pages(struct ion_page_pool *pool) { + if (fatal_signal_pending(current)) + return NULL; return alloc_pages(pool->gfp_mask, pool->order); }