Description
In the Linux kernel, the following vulnerability has been resolved: 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.
Product status
48cac3f4a96ddf08df8e53809ed066de0dc93915 before 97303e541e12f1fea97834ec64b98991e8775f39
48cac3f4a96ddf08df8e53809ed066de0dc93915 before 61d5fa45ed13e42af14c7e959baba9908b8ee6d4
48cac3f4a96ddf08df8e53809ed066de0dc93915 before e7be679124bae8cf4fa6e40d7e1661baddfb3289
48cac3f4a96ddf08df8e53809ed066de0dc93915 before 6952aeace93f8c9ea01849efecac24dd3152c9c9
48cac3f4a96ddf08df8e53809ed066de0dc93915 before 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8
48cac3f4a96ddf08df8e53809ed066de0dc93915 before f8242745871f81a3ac37f9f51853d12854fd0b58
5.13
Any version before 5.13
5.15.190
6.1.147
6.6.100
6.12.40
6.15.8
6.16
References
git.kernel.org/...c/97303e541e12f1fea97834ec64b98991e8775f39
git.kernel.org/...c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4
git.kernel.org/...c/e7be679124bae8cf4fa6e40d7e1661baddfb3289
git.kernel.org/...c/6952aeace93f8c9ea01849efecac24dd3152c9c9
git.kernel.org/...c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8
git.kernel.org/...c/f8242745871f81a3ac37f9f51853d12854fd0b58
