linux-kernel - [PATCH 3.10 140/268] mm, fs: check for fatal signals in do_generic_file

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Message-Id: <1497897167-14556-141-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:30:39 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Michal Hocko <mhocko@...e.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 140/268] mm, fs: check for fatal signals in do_generic_file_read()

From: Michal Hocko <mhocko@...e.com>

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@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 mm/filemap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index 725a100..7213078 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1123,6 +1123,11 @@ static void 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,
-- 
2.8.0.rc2.1.gbe9624a