From c03d630ad6b4eb1e1f62cb6c30557fef86012d9c Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Tue, 12 Nov 2024 00:21:37 +0800 Subject: [PATCH] tracing: Consider the NULL character when validating the event length stable inclusion from stable-v6.6.59 commit a14a075a14af8d622c576145455702591bdde09d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB2BWY CVE: CVE-2024-50131 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a14a075a14af8d622c576145455702591bdde09d -------------------------------- [ Upstream commit 0b6e2e22cb23105fcb171ab92f0f7516c69c8471 ] strlen() returns a string length excluding the null byte. If the string length equals to the maximum buffer length, the buffer will have no space for the NULL terminating character. This commit checks this condition and returns failure for it. Link: https://lore.kernel.org/all/20241007144724.920954-1-leo.yan@arm.com/ Fixes: dec65d79fd26 ("tracing/probe: Check event name length correctly") Signed-off-by: Leo Yan Reviewed-by: Steven Rostedt (Google) Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Sasha Levin Signed-off-by: Li Huafei --- kernel/trace/trace_probe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 23d1dbef3502..ca04e9c53b37 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -276,7 +276,7 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup, } trace_probe_log_err(offset, NO_EVENT_NAME); return -EINVAL; - } else if (len > MAX_EVENT_NAME_LEN) { + } else if (len >= MAX_EVENT_NAME_LEN) { trace_probe_log_err(offset, EVENT_TOO_LONG); return -EINVAL; } -- Gitee