lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 1 Apr 2022 15:10:13 -0700 From: "Chang S. Bae" <chang.seok.bae@...el.com> To: linux-kselftest@...r.kernel.org, shuah@...nel.org, linux-kernel@...r.kernel.org Cc: dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...e.de, chang.seok.bae@...el.com Subject: [PATCH 1/2] selftests/x86/signal: Adjust the test to the kernel's altstack check The test assumes an insufficient altstack is allowed. Then it raises a signal to test the delivery failure due to an altstack overflow. The kernel now provides an option to tweak sigaltstack()'s sanity check to prevent an insufficient altstack. ENOMEM is returned on the check failure. Adjust the code to skip the test when this option is on. Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com> Cc: linux-kselftest@...r.kernel.org Cc: linux-kernel@...r.kernel.org --- tools/testing/selftests/x86/sigaltstack.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/x86/sigaltstack.c b/tools/testing/selftests/x86/sigaltstack.c index f689af75e979..22a88b764a8e 100644 --- a/tools/testing/selftests/x86/sigaltstack.c +++ b/tools/testing/selftests/x86/sigaltstack.c @@ -88,8 +88,18 @@ static void sigalrm(int sig, siginfo_t *info, void *ctx_void) static void test_sigaltstack(void *altstack, unsigned long size) { - if (setup_altstack(altstack, size)) + if (setup_altstack(altstack, size)) { + /* + * The kernel may return ENOMEM when the altstack size + * is insufficient. Skip the test in this case. + */ + if (errno == ENOMEM && size < at_minstack_size) { + printf("[SKIP]\tThe running kernel disallows an insufficient size.\n"); + return; + } + err(1, "sigaltstack()"); + } sigalrm_expected = (size > at_minstack_size) ? true : false; -- 2.17.1
Powered by blists - more mailing lists