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x86/cet: Check legacy shadow stack applications

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Add tests to verify that legacy shadow stack applications run properly
when shadow stack is enabled in Linux kernel.
This commit is contained in:
H.J. Lu 2023-03-21 12:53:24 -07:00
parent 1e70252508
commit f418fe6f97
6 changed files with 130 additions and 0 deletions
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23
sysdeps/x86/Makefile
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@ -162,6 +162,21 @@ tests-static += \
tst-cet-legacy-10-static \
# tests-static
tst-cet-legacy-1a-ARGS = -- $(host-test-program-cmd)
tests += \
tst-shstk-legacy-1a \
tst-shstk-legacy-1a-static \
tst-shstk-legacy-1b \
tst-shstk-legacy-1b-static \
# tests
tests-static += \
tst-shstk-legacy-1a-static \
tst-shstk-legacy-1b-static \
# tests-static
extra-objs += \
tst-shstk-legacy-1-extra.o \
# extra-objs
tests += \
tst-cet-legacy-4a \
tst-cet-legacy-4b \
@ -212,6 +227,9 @@ CFLAGS-tst-cet-legacy-7.c += -fcf-protection=none
CFLAGS-tst-cet-legacy-10.c += -mshstk
CFLAGS-tst-cet-legacy-10-static.c += -mshstk
CFLAGS-tst-shstk-legacy-1a.c += -fcf-protection=none
CFLAGS-tst-shstk-legacy-1a-static.c += -fcf-protection=none
$(objpfx)tst-cet-legacy-1: $(objpfx)tst-cet-legacy-mod-1.so \
$(objpfx)tst-cet-legacy-mod-2.so
$(objpfx)tst-cet-legacy-1a: $(objpfx)tst-cet-legacy-mod-1.so \
@ -244,6 +262,11 @@ $(objpfx)tst-cet-legacy-6b.out: $(objpfx)tst-cet-legacy-mod-6a.so \
tst-cet-legacy-6b-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
tst-cet-legacy-9-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
tst-cet-legacy-9-static-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
$(objpfx)tst-shstk-legacy-1a: $(objpfx)tst-shstk-legacy-1-extra.o
$(objpfx)tst-shstk-legacy-1a-static: $(objpfx)tst-shstk-legacy-1-extra.o
$(objpfx)tst-shstk-legacy-1b: $(objpfx)tst-shstk-legacy-1-extra.o
$(objpfx)tst-shstk-legacy-1b-static: $(objpfx)tst-shstk-legacy-1-extra.o
endif
# Add -fcf-protection to CFLAGS when CET is enabled.

35
sysdeps/x86/tst-shstk-legacy-1-extra.S Normal file
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@ -0,0 +1,35 @@
/* Legacy shadow stack code.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
.text
.globl legacy
.type legacy, @function
legacy:
.cfi_startproc
#ifdef __x86_64__
movq (%rsp), %rax
addq $8, %rsp
jmp *%rax
#else
movl (%esp), %eax
addl $4, %esp
jmp *%eax
#endif
.cfi_endproc
.size legacy, .-legacy
.section .note.GNU-stack,"",@progbits

1
sysdeps/x86/tst-shstk-legacy-1a-static.c Normal file
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@ -0,0 +1 @@
#include "tst-shstk-legacy-1a.c"

32
sysdeps/x86/tst-shstk-legacy-1a.c Normal file
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@ -0,0 +1,32 @@
/* Check that legacy shadow stack code won't trigger segfault.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <support/test-driver.h>
/* Check that legacy shadow stack code won't trigger segfault. */
extern void legacy (void);
static int
do_test (void)
{
legacy ();
return EXIT_SUCCESS;
}
#include <support/test-driver.c>

1
sysdeps/x86/tst-shstk-legacy-1b-static.c Normal file
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@ -0,0 +1 @@
#include "tst-shstk-legacy-1b.c"

38
sysdeps/x86/tst-shstk-legacy-1b.c Normal file
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@ -0,0 +1,38 @@
/* Check that legacy shadow stack code will trigger segfault.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <sys/platform/x86.h>
#include <support/test-driver.h>
#include <support/xsignal.h>
/* Check that legacy shadow stack code will trigger segfault. */
extern void legacy (void);
static int
do_test (void)
{
if (!CPU_FEATURE_ACTIVE (SHSTK))
return EXIT_UNSUPPORTED;
legacy ();
return EXIT_FAILURE;
}
#define EXPECTED_SIGNAL (CPU_FEATURE_ACTIVE (SHSTK) ? SIGSEGV : 0)
#include <support/test-driver.c>