diff options
| author | Paul Chaignon <[email protected]> | 2025-07-01 19:47:30 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <[email protected]> | 2025-07-01 22:22:46 +0000 |
| commit | f8242745871f81a3ac37f9f51853d12854fd0b58 (patch) | |
| tree | d50b443e6fc4e8351fc05ba09384ac79a43b3955 /tools/testing/selftests/drivers/net/hw/rss_api.py | |
| parent | Merge tag 'io_uring-6.16-20250630' of git://git.kernel.dk/linux (diff) | |
| download | kernel-f8242745871f81a3ac37f9f51853d12854fd0b58.tar.gz kernel-f8242745871f81a3ac37f9f51853d12854fd0b58.zip | |
bpf: Reject %p% format string in bprintf-like helpers
static const char fmt[] = "%p%";
bpf_trace_printk(fmt, sizeof(fmt));
The above BPF program isn't rejected and causes a kernel warning at
runtime:
Please remove unsupported %\x00 in format string
WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0
This happens because bpf_bprintf_prepare skips over the second %,
detected as punctuation, while processing %p. This patch fixes it by
not skipping over punctuation. %\x00 is then processed in the next
iteration and rejected.
Reported-by: [email protected]
Fixes: 48cac3f4a96d ("bpf: Implement formatted output helpers with bstr_printf")
Acked-by: Yonghong Song <[email protected]>
Signed-off-by: Paul Chaignon <[email protected]>
Link: https://lore.kernel.org/r/a0e06cc479faec9e802ae51ba5d66420523251ee.1751395489.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov <[email protected]>
Diffstat (limited to 'tools/testing/selftests/drivers/net/hw/rss_api.py')
0 files changed, 0 insertions, 0 deletions