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authorMichal Hocko <mhocko@suse.com>2017-02-03 13:13:29 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-09 08:02:46 +0100
commit4025ab36c81cfa4eb24f2ff98066b1ad00359ab9 (patch)
tree91c0f1b9cde058f7bbe670f2a9ec6f5ae0a4c867 /mm
parente86a8769579e945828d834964d09477e9b2e7d0e (diff)
downloadlinux-linaro-stable-4025ab36c81cfa4eb24f2ff98066b1ad00359ab9.tar.gz
mm, fs: check for fatal signals in do_generic_file_read()
commit 5abf186a30a89d5b9c18a6bf93a2c192c9fd52f6 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>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index c588d1222b2a..c33c31d75a2b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1559,6 +1559,11 @@ 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,