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author | Lizhi Xu <lizhi.xu@windriver.com> | 2024-12-16 08:32:38 +0100 |
---|---|---|
committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-12-24 03:59:15 +0100 |
commit | 98feccbf32cfdde8c722bc4587aaa60ee5ac33f0 (patch) | |
tree | 9ed8e0d488b03c81e35c9b68ca4d60a16e80b3ec /kernel | |
parent | tracing: Constify string literal data member in struct trace_event_call (diff) | |
download | linux-98feccbf32cfdde8c722bc4587aaa60ee5ac33f0.tar.xz linux-98feccbf32cfdde8c722bc4587aaa60ee5ac33f0.zip |
tracing: Prevent bad count for tracing_cpumask_write
If a large count is provided, it will trigger a warning in bitmap_parse_user.
Also check zero for it.
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
Signed-off-by: Lizhi Xu <lizhi.xu@windriver.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/trace/trace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 957f941a08e7..f8aebcb01e62 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5087,6 +5087,9 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf, cpumask_var_t tracing_cpumask_new; int err; + if (count == 0 || count > KMALLOC_MAX_SIZE) + return -EINVAL; + if (!zalloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) return -ENOMEM; |