Date: Sat, 10 Jul 2021 00:48:12 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: 588c7a06dffb - main - KASAN: Implement __asan_unregister_globals() Message-ID: <202107100048.16A0mCp4072410@gitrepo.freebsd.org>
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The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=588c7a06dffbc74b281dacbdd854437b0815e501 commit 588c7a06dffbc74b281dacbdd854437b0815e501 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-07-10 00:38:28 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-07-10 00:38:50 +0000 KASAN: Implement __asan_unregister_globals() It will be called during KLD unload to unpoison the redzones following global variables. Otherwise, virtual address ranges previously used for a KLD may be left tainted, triggering false positives when they are recycled. Reported by: pho Sponsored by: The FreeBSD Foundation --- sys/kern/subr_asan.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/sys/kern/subr_asan.c b/sys/kern/subr_asan.c index b812f7bca465..07f7b44d08d7 100644 --- a/sys/kern/subr_asan.c +++ b/sys/kern/subr_asan.c @@ -948,7 +948,12 @@ __asan_register_globals(struct __asan_global *globals, size_t n) void __asan_unregister_globals(struct __asan_global *globals, size_t n) { - /* never called */ + size_t i; + + for (i = 0; i < n; i++) { + kasan_mark(globals[i].beg, globals[i].size_with_redzone, + globals[i].size_with_redzone, 0); + } } #define ASAN_LOAD_STORE(size) \home | help
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