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mm, fs: check for fatal signals in do_generic_file_read()

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commit 5abf186a30 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michal Hocko 2017-02-03 13:13:29 -08:00 committed by Greg Kroah-Hartman
parent 6cb0497aec
commit b67c7d39bc
1 changed files with 5 additions and 0 deletions
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5
mm/filemap.c
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@ -1703,6 +1703,11 @@ static ssize_t do_generic_file_read(struct file *filp, loff_t *ppos,
cond_resched();
find_page:
if (fatal_signal_pending(current)) {
error = -EINTR;
goto out;
}
page = find_get_page(mapping, index);
if (!page) {
page_cache_sync_readahead(mapping,