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Message-Id: <20240621022959.9124-8-laoar.shao@gmail.com>
Date: Fri, 21 Jun 2024 10:29:55 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: torvalds@...ux-foundation.org
Cc: ebiederm@...ssion.com,
alexei.starovoitov@...il.com,
rostedt@...dmis.org,
catalin.marinas@....com,
akpm@...ux-foundation.org,
penguin-kernel@...ove.sakura.ne.jp,
linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
audit@...r.kernel.org,
linux-security-module@...r.kernel.org,
selinux@...r.kernel.org,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v3 07/11] mm/kmemleak: Replace strncpy() with __get_task_comm()
Since task lock was dropped from __get_task_comm(), it's safe to call it
from kmemleak.
Using __get_task_comm() to read the task comm ensures that the name is
always NUL-terminated, regardless of the source string. This approach also
facilitates future extensions to the task comm.
Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Acked-by: Catalin Marinas <catalin.marinas@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
mm/kmemleak.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index d5b6fba44fc9..ef29aaab88a0 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -663,13 +663,7 @@ static struct kmemleak_object *__alloc_object(gfp_t gfp)
strncpy(object->comm, "softirq", sizeof(object->comm));
} else {
object->pid = current->pid;
- /*
- * There is a small chance of a race with set_task_comm(),
- * however using get_task_comm() here may cause locking
- * dependency issues with current->alloc_lock. In the worst
- * case, the command line is not correct.
- */
- strncpy(object->comm, current->comm, sizeof(object->comm));
+ __get_task_comm(object->comm, sizeof(object->comm), current);
}
/* kernel backtrace */
--
2.39.1
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