Date: Tue, 24 Oct 2023 22:07:05 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 1798b44fda38 - main - user stack randomization: only enable by default for 64bit processes Message-ID: <202310242207.39OM75v9041754@gitrepo.freebsd.org>
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The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=1798b44fda382c473c9fc7762e162613a39dc23c commit 1798b44fda382c473c9fc7762e162613a39dc23c Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2023-10-24 21:44:06 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2023-10-24 22:06:48 +0000 user stack randomization: only enable by default for 64bit processes All aslr knobs are disabled by default for 32bit processes, except stack. This results in weird stack location, typically making around 1G of user address space hard to use. Reviewed by: emaste Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D42356 --- sys/kern/imgact_elf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c index e01bccc93cb0..4ebd08082545 100644 --- a/sys/kern/imgact_elf.c +++ b/sys/kern/imgact_elf.c @@ -200,7 +200,7 @@ SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW, &__elfN(aslr_honor_sbrk), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used"); -static int __elfN(aslr_stack) = 1; +static int __elfN(aslr_stack) = __ELF_WORD_SIZE == 64; SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, stack, CTLFLAG_RWTUN, &__elfN(aslr_stack), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
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