Date: Thu, 29 Feb 2024 20:08:03 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 277382] Wrong (or at least strange) stack growth for amd64 pthread stacks Message-ID: <bug-277382-227-rVErHyeLN6@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-277382-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277382 --- Comment #4 from Paul Floyd <pjfloyd@wanadoo.fr> --- The mmap and mprotect are done in libth thr_stack.c 265 /* Map the stack and guard page together, and split guard 266 page from allocated space: */ 267 if ((stackaddr = mmap(stackaddr, stacksize + guardsize, 268 _rtld_get_stack_prot(), MAP_STACK, 269 -1, 0)) != MAP_FAILED && 270 (guardsize == 0 || 271 mprotect(stackaddr, guardsize, PROT_NONE) == 0)) { 272 stackaddr += guardsize; >From what I see that can the default can be overridden with _thr_attr_setguardsize but otherwise it is set to getpagesize(). Maybe libthr should check security.bsd.stack_guard_page and if it is 1 or more not add the extra guard page. -- You are receiving this mail because: You are the assignee for the bug.home | help
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