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ktrace: Zero request structures when populating the pool

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Otherwise uninitialized pad bytes may be copied into the ktrace log
file.

Reported by:	KMSAN
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-07-23 10:29:53 -04:00
parent 9666cda976
commit 5c18bf9d5f
1 changed files with 3 additions and 2 deletions
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5
sys/kern/kern_ktrace.c
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@ -219,7 +219,8 @@ ktrace_init(void *dummy)
sx_init(&ktrace_sx, "ktrace_sx");
STAILQ_INIT(&ktr_free);
for (i = 0; i < ktr_requestpool; i++) {
req = malloc(sizeof(struct ktr_request), M_KTRACE, M_WAITOK);
req = malloc(sizeof(struct ktr_request), M_KTRACE, M_WAITOK |
M_ZERO);
STAILQ_INSERT_HEAD(&ktr_free, req, ktr_list);
}
}
@ -285,7 +286,7 @@ ktrace_resize_pool(u_int oldsize, u_int newsize)
STAILQ_INIT(&ktr_new);
while (bound-- > 0) {
req = malloc(sizeof(struct ktr_request), M_KTRACE,
M_WAITOK);
M_WAITOK | M_ZERO);
STAILQ_INSERT_HEAD(&ktr_new, req, ktr_list);
}
mtx_lock(&ktrace_mtx);