tree a142d194538ea2fcae82df112d1959d88a569bea
parent ada9230043d5991faec4f20e0c08d5b33533c13c
author Lizhi Xu <lizhi.xu@windriver.com> 1734334358 +0800
committer Kevin Berry <kpberry@google.com> 1736710513 -0800

tracing: Prevent bad count for tracing_cpumask_write

commit 98feccbf32cfdde8c722bc4587aaa60ee5ac33f0 upstream.

If a large count is provided, it will trigger a warning in bitmap_parse_user.
Also check zero for it.

BUG=b/388468889
TEST=presubmit
RELEASE_NOTE=Fixed CVE-2024-56763 in the Linux kernel.

cos-patch: security-moderate
Cc: stable@vger.kernel.org
Fixes: 9e01c1b74c953 ("cpumask: convert kernel trace functions")
Link: https://lore.kernel.org/20241216073238.2573704-1-lizhi.xu@windriver.com
Reported-by: syzbot+0aecfd34fb878546f3fd@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0aecfd34fb878546f3fd
Tested-by: syzbot+0aecfd34fb878546f3fd@syzkaller.appspotmail.com
Change-Id: I1bf2a3116df4ad860572d176a78698782aea2523
Signed-off-by: Lizhi Xu <lizhi.xu@windriver.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kernel CVE Triage Automation <cloud-image-kernel-cve-triage-automation@prod.google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/89859
Reviewed-by: Kevin Berry <kpberry@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Anil Altinay <aaltinay@google.com>