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Brendan Jackman 4aae6eb6af libbpf: Fix signed overflow in ringbuf_process_ring

[ Upstream commit 2a30f94406 ]

One of our benchmarks running in (Google-internal) CI pushes data
through the ringbuf faster htan than userspace is able to consume
it. In this case it seems we're actually able to get >INT_MAX entries
in a single ring_buffer__consume() call. ASAN detected that cnt
overflows in this case.

Fix by using 64-bit counter internally and then capping the result to
INT_MAX before converting to the int return type. Do the same for
the ring_buffer__poll().

Fixes: bf99c936f9 (libbpf: Add BPF ring buffer support)
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210429130510.1621665-1-jackmanb@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-05-19 10:13:06 +02:00

api

libperf: Avoid counting of nonfilterable fdarray fds

2020-07-21 09:53:22 -03:00

bpf

libbpf: Fix signed overflow in ringbuf_process_ring

2021-05-19 10:13:06 +02:00

lockdep

.gitignore: add SPDX License Identifier

2020-03-25 11:50:48 +01:00

perf

perf jit: Let convert_timestamp() to be backwards-compatible