diff options
| author | Wang Liang <wangliang74@huawei.com> | 2025-09-06 11:56:10 +0800 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-09-06 12:12:38 -0400 |
| commit | c1628c00c4351dd0727ef7f670694f68d9e663d8 (patch) | |
| tree | abe8f20d4f24e95d7527be8b39c266092d4c8086 /scripts/rust_is_available_test.py | |
| parent | ab1396af7595e7d49a3850481b24d7fe7cbdfd31 (diff) | |
tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
A crash was observed with the following output:
BUG: kernel NULL pointer dereference, address: 0000000000000010
Oops: Oops: 0000 [#1] SMP NOPTI
CPU: 2 UID: 0 PID: 92 Comm: osnoise_cpus Not tainted 6.17.0-rc4-00201-gd69eb204c255 #138 PREEMPT(voluntary)
RIP: 0010:bitmap_parselist+0x53/0x3e0
Call Trace:
<TASK>
osnoise_cpus_write+0x7a/0x190
vfs_write+0xf8/0x410
? do_sys_openat2+0x88/0xd0
ksys_write+0x60/0xd0
do_syscall_64+0xa4/0x260
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
This issue can be reproduced by below code:
fd=open("/sys/kernel/debug/tracing/osnoise/cpus", O_WRONLY);
write(fd, "0-2", 0);
When user pass 'count=0' to osnoise_cpus_write(), kmalloc() will return
ZERO_SIZE_PTR (16) and cpulist_parse() treat it as a normal value, which
trigger the null pointer dereference. Add check for the parameter 'count'.
Cc: <mhiramat@kernel.org>
Cc: <mathieu.desnoyers@efficios.com>
Cc: <tglozar@redhat.com>
Link: https://lore.kernel.org/20250906035610.3880282-1-wangliang74@huawei.com
Fixes: 17f89102fe23 ("tracing/osnoise: Allow arbitrarily long CPU string")
Signed-off-by: Wang Liang <wangliang74@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'scripts/rust_is_available_test.py')
0 files changed, 0 insertions, 0 deletions