mm, fs: check for fatal signals in do_generic_file_read()
authorMichal Hocko <mhocko@suse.com>
Fri, 3 Feb 2017 21:13:29 +0000 (13:13 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Feb 2017 22:13:19 +0000 (14:13 -0800)
commit5abf186a30a89d5b9c18a6bf93a2c192c9fd52f6
tree5cb5c671a5ca2b92a1a54a2721a8c06a493966d1
parentd1908f52557b3230fbd63c0429f3b4b748bf2b6d
mm, fs: check for fatal signals in do_generic_file_read()

do_generic_file_read() can be told to perform a large request from
userspace.  If the system is under OOM and the reading task is the OOM
victim then it has an access to memory reserves and finishing the full
request can lead to the full memory depletion which is dangerous.  Make
sure we rather go with a short read and allow the killed task to
terminate.

Link: http://lkml.kernel.org/r/20170201092706.9966-3-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/filemap.c