diff options
author | Ming Lei <ming.lei@redhat.com> | 2019-11-02 16:02:15 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-17 20:39:28 +0100 |
commit | 365874a0eab5478d2d4f7b30e57bfc51dde7843c (patch) | |
tree | 2b8f94e176f469cfbc666f44d221436f6a7f9dfd /kernel | |
parent | 51fb33d0b2b1c9bb69e5612eae5b57837f767e71 (diff) |
blk-mq: avoid sysfs buffer overflow with too many CPU cores
commit 8962842ca5abdcf98e22ab3b2b45a103f0408b95 upstream.
It is reported that sysfs buffer overflow can be triggered if the system
has too many CPU cores(>841 on 4K PAGE_SIZE) when showing CPUs of
hctx via /sys/block/$DEV/mq/$N/cpu_list.
Use snprintf to avoid the potential buffer overflow.
This version doesn't change the attribute format, and simply stops
showing CPU numbers if the buffer is going to overflow.
Cc: stable@vger.kernel.org
Fixes: 676141e48af7("blk-mq: don't dump CPU -> hw queue map on driver load")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions