bpf, arm64: Fix incorrect runtime stats

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[ Upstream commit dc7d7447b5 ]

When __bpf_prog_enter() returns zero, the arm64 register x20 that stores
prog start time is not assigned to zero, causing incorrect runtime stats.

To fix it, assign the return value of bpf_prog_enter() to x20 register
immediately upon its return.

Fixes: efc9909fdc ("bpf, arm64: Add bpf trampoline for arm64")
Reported-by: Ivan Babrou <ivan@cloudflare.com>
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Ivan Babrou <ivan@cloudflare.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240416064208.2919073-2-xukuohai@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Xu Kuohai 2024-04-16 14:42:07 +08:00 • committed by Greg Kroah-Hartman

parent f75a570655

commit a554fef56c

1 changed files with 3 additions and 3 deletions

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arch/arm64/net/bpf_jit_comp.c

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