104 lines
2.8 KiB
Diff
104 lines
2.8 KiB
Diff
From f722c6853035ab390757eb725e0661cf22b9791e Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Sun, 16 Jan 2022 12:09:57 -0800
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Subject: [PATCH v2 02/15] x86/cet: Update tst-cet-vfork-1
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Change tst-cet-vfork-1.c to verify that vfork child return triggers
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SIGSEGV due to shadow stack mismatch.
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---
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sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c | 43 ++++++++-----------
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1 file changed, 17 insertions(+), 26 deletions(-)
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diff --git a/sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c b/sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c
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index 9c4b6f4d42..c92ed9e737 100644
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--- a/sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c
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+++ b/sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c
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@@ -18,34 +18,26 @@
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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-#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <x86intrin.h>
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#include <support/test-driver.h>
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-#include <support/xsignal.h>
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-#include <support/xunistd.h>
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__attribute__ ((noclone, noinline))
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static void
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do_test_1 (void)
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{
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pid_t p1;
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- int fd[2];
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- if (pipe (fd) == -1)
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- {
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- puts ("pipe failed");
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- _exit (EXIT_FAILURE);
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- }
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+ /* NB: Since child return pops shadow stack which is shared with
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+ parent, child must not return after vfork. */
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if ((p1 = vfork ()) == 0)
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{
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- pid_t p = getpid ();
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- TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p)));
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- /* Child return should trigger SIGSEGV. */
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+ /* Child return should trigger SIGSEGV due to shadow stack
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+ mismatch. */
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return;
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}
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else if (p1 == -1)
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@@ -54,22 +46,22 @@ do_test_1 (void)
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_exit (EXIT_FAILURE);
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}
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- pid_t p2 = 0;
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- if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t)))
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- != sizeof (pid_t))
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- puts ("pipd read failed");
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- else
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+ int r;
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+ if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
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{
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- int r;
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- if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
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- puts ("waitpid failed");
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- else if (r != 0)
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- puts ("pip write in child failed");
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+ puts ("waitpid failed");
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+ _exit (EXIT_FAILURE);
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+ }
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+
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+ if (!WIFSIGNALED (r) || WTERMSIG (r) != SIGSEGV)
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+ {
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+ puts ("Child not terminated with SIGSEGV");
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+ _exit (EXIT_FAILURE);
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}
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/* Parent exits immediately so that parent returns without triggering
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- SIGSEGV when shadow stack isn't in use. */
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- _exit (EXIT_FAILURE);
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+ SIGSEGV when shadow stack is in use. */
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+ _exit (EXIT_SUCCESS);
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}
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static int
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@@ -80,9 +72,8 @@ do_test (void)
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return EXIT_UNSUPPORTED;
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do_test_1 ();
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/* Child exits immediately so that child returns without triggering
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- SIGSEGV when shadow stack isn't in use. */
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+ SIGSEGV when shadow stack is in use. */
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_exit (EXIT_FAILURE);
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}
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-#define EXPECTED_SIGNAL (_get_ssp () == 0 ? 0 : SIGSEGV)
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#include <support/test-driver.c>
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--
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2.40.1
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