Re: [PATCH bpf-next] bpf: test_run: Fix overflow in xdp frags bpf_test_finish
From: Stanislav Fomichev <hidden>
Date: 2022-03-01 16:38:39
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bpf
On Tue, Mar 1, 2022 at 8:33 AM Daniel Borkmann [off-list ref] wrote:
On 3/1/22 12:23 AM, Stanislav Fomichev wrote:quoted
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@kernel.org> Signed-off-by: Stanislav Fomichev <redacted>Do we have a Reported-by tag for syzkaller so it can match against its report?
Oops, sorry, totally forgot: Reported-by: syzbot+5f81df6205ecbbc56ab5@syzkaller.appspotmail.com