bpf: Notify user if we ever hit a bpf_snprintf verifier bug

Browse source

In check_bpf_snprintf_call(), a map_direct_value_addr() of the fmt map
should never fail because it has already been checked by
ARG_PTR_TO_CONST_STR. But if it ever fails, it's better to error out
with an explicit debug message rather than silently fail.

Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210422235543.4007694-2-revest@chromium.org

...

This commit is contained in:

Florent Revest 2021-04-23 01:55:42 +02:00 • committed by Alexei Starovoitov

parent e7a1c13008

commit 8e8ee109b0

1 changed files with 4 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

kernel/bpf/verifier.c

View file