From: Michal Hocko <mhocko@xxxxxxxx> Subject: 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@xxxxxxxxxx Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/filemap.c | 5 +++++ 1 file changed, 5 insertions(+) diff -puN mm/filemap.c~mm-fs-check-for-fatal-signals-in-do_generic_file_read mm/filemap.c --- a/mm/filemap.c~mm-fs-check-for-fatal-signals-in-do_generic_file_read +++ a/mm/filemap.c @@ -1791,6 +1791,11 @@ static ssize_t do_generic_file_read(stru 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, _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
