Re: [PATCH bpf-next] bpf: test_run: Fix overflow in xdp frags bpf_test_finish

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On 3/1/22 12:23 AM, Stanislav Fomichev wrote:
Syzkaller reports another issue:
WARNING: CPU: 0 PID: 10775 at include/linux/thread_info.h:230
check_copy_size include/linux/thread_info.h:230 [inline]
WARNING: CPU: 0 PID: 10775 at include/linux/thread_info.h:230
copy_to_user include/linux/uaccess.h:199 [inline]
WARNING: CPU: 0 PID: 10775 at include/linux/thread_info.h:230
bpf_test_finish.isra.0+0x4b2/0x680 net/bpf/test_run.c:171

This can happen when the userspace buffer is smaller than head+frags.
Return ENOSPC in this case.

Fixes: 7855e0db150a ("bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature")
Cc: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>

Do we have a Reported-by tag for syzkaller so it can match against its report?

Thanks,
Daniel



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