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bpf: ensure all memory is initialized in bpf_get_current_comm

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BPF helpers that take an ARG_PTR_TO_UNINIT_MEM must ensure that all of
the memory is set, including beyond the end of the string.

Signed-off-by: Barret Rhoden <brho@google.com>
Link: https://lore.kernel.org/r/20230407001808.1622968-1-brho@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Barret Rhoden 2023-04-06 20:18:08 -04:00 committed by Alexei Starovoitov
parent 4daf0b327f
commit f3f2134977
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/helpers.c
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@ -258,7 +258,7 @@ BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size)
goto err_clear; goto err_clear;
/* Verifier guarantees that size > 0 */ /* Verifier guarantees that size > 0 */
strscpy(buf, task->comm, size); strscpy_pad(buf, task->comm, size);
return 0; return 0;
err_clear: err_clear:
memset(buf, 0, size); memset(buf, 0, size);