Date: Wed, 6 Oct 2021 20:09:53 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 880b670c6fdb - main - malloc: Unmark KASAN redzones if the full allocation size was requested Message-ID: <202110062009.196K9rJY069527@gitrepo.freebsd.org>
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The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=880b670c6fdbd1268887869375771e0a74d2c8ac commit 880b670c6fdbd1268887869375771e0a74d2c8ac Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-10-06 20:03:30 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-10-06 20:09:41 +0000 malloc: Unmark KASAN redzones if the full allocation size was requested Consumers that want the full allocation size will typically access the full buffer, so mark the entire allocation as valid to avoid useless KASAN reports. Sponsored by: The FreeBSD Foundation --- sys/kern/kern_malloc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c index b1c5909db2a4..4ecdcdacce01 100644 --- a/sys/kern/kern_malloc.c +++ b/sys/kern/kern_malloc.c @@ -1112,6 +1112,13 @@ malloc_usable_size(const void *addr) else size = malloc_large_size(slab); #endif + + /* + * Unmark the redzone to avoid reports from consumers who are + * (presumably) about to use the full allocation size. + */ + kasan_mark(addr, size, size, 0); + return (size); }
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