From nobody Sun Nov 21 17:59:03 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id BE3DF188C64A; Sun, 21 Nov 2021 17:59:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Hxynz4xCkz4sHd; Sun, 21 Nov 2021 17:59:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 7FD7A13D96; Sun, 21 Nov 2021 17:59:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1ALHx3Mh041800; Sun, 21 Nov 2021 17:59:03 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1ALHx3ps041799; Sun, 21 Nov 2021 17:59:03 GMT (envelope-from git) Date: Sun, 21 Nov 2021 17:59:03 GMT Message-Id: <202111211759.1ALHx3ps041799@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Ed Maste Subject: git: 8ec4c5dae327 - main - Fix coredump_phnum test with ASLR enabled by default List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: emaste X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 8ec4c5dae32765701ac70811455084efd1570c32 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=8ec4c5dae32765701ac70811455084efd1570c32 commit 8ec4c5dae32765701ac70811455084efd1570c32 Author: Ed Maste AuthorDate: 2021-11-21 17:17:20 +0000 Commit: Ed Maste CommitDate: 2021-11-21 17:57:38 +0000 Fix coredump_phnum test with ASLR enabled by default coredump_phnum intends to generate a core file with many PT_LOAD segments. Previously it called mmap() in a loop with alternating protections, relying on each mapping following the previous, to produce a core file with many page-sized PT_LOAD segments. With ASLR on we no longer have this property of each mmap() following the previous. Instead, perform a single allocation, and then use mprotect() to set alternating pages to PROT_READ. PR: 259970 Reported by: lwhsu, mw Reviewed by: kib MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D33070 --- tests/sys/kern/coredump_phnum_helper.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/tests/sys/kern/coredump_phnum_helper.c b/tests/sys/kern/coredump_phnum_helper.c index da023e691a24..0dff59b918d9 100644 --- a/tests/sys/kern/coredump_phnum_helper.c +++ b/tests/sys/kern/coredump_phnum_helper.c @@ -42,18 +42,21 @@ int main(int argc __unused, char **argv __unused) { void *v; - unsigned i; + size_t i, pages; - for (i = 0; i < UINT16_MAX + 1000; i++) { + pages = UINT16_MAX + 1000; + v = mmap(NULL, pages * PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE, -1, 0); + if (v == NULL) + err(1, "mmap"); + for (i = 0; i < pages; i += 2) { /* - * Alternate protections; otherwise the kernel will just extend - * the adjacent same-protection previous mapping. + * Alternate protections to interleave RW and R PT_LOAD + * segments. */ - v = mmap(NULL, PAGE_SIZE, - (((i % 2) == 0) ? PROT_READ : 0) | PROT_WRITE, - MAP_ANON | MAP_PRIVATE, -1, 0); - if (v == MAP_FAILED) - err(1, "mmap"); + if (mprotect((char *)v + i * PAGE_SIZE, PAGE_SIZE, + PROT_READ) != 0) + err(1, "mprotect"); } /* Dump core. */