Commit f3f21349 authored by Barret Rhoden's avatar Barret Rhoden Committed by Alexei Starovoitov
Browse files

bpf: ensure all memory is initialized in bpf_get_current_comm 



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: default avatarBarret Rhoden <brho@google.com>
Link: https://lore.kernel.org/r/20230407001808.1622968-1-brho@google.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 4daf0b32

kernel/bpf/helpers.c

+1 −1
Original line number Diff line number Diff line
@@ -258,7 +258,7 @@ BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size) 
		goto err_clear;



	/* Verifier guarantees that size > 0 */

	strscpy(buf, task->comm, size);

	strscpy_pad(buf, task->comm, size);

	return 0;

err_clear:

	memset(buf, 0, size);