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glibc/v2-0004-x86-cet-Check-legacy-shadow-stack-applications.patch
Siddhesh Poyarekar 144f612406 Shadow stack userspace support 
Downstream only and disabled by default.
2023-06-08 13:31:34 -04:00

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From 2db487201909cf8fc1216e0b41e5bdd0d6677460 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 21 Mar 2023 12:53:24 -0700
Subject: [PATCH v2 04/15] x86/cet: Check legacy shadow stack applications
Add tests to verify that legacy shadow stack applications run properly
when shadow stack is enabled in Linux kernel.
---
sysdeps/x86/Makefile | 23 ++++++++++++++
sysdeps/x86/tst-shstk-legacy-1-extra.S | 35 ++++++++++++++++++++++
sysdeps/x86/tst-shstk-legacy-1a-static.c | 1 +
sysdeps/x86/tst-shstk-legacy-1a.c | 32 ++++++++++++++++++++
sysdeps/x86/tst-shstk-legacy-1b-static.c | 1 +
sysdeps/x86/tst-shstk-legacy-1b.c | 38 ++++++++++++++++++++++++
6 files changed, 130 insertions(+)
create mode 100644 sysdeps/x86/tst-shstk-legacy-1-extra.S
create mode 100644 sysdeps/x86/tst-shstk-legacy-1a-static.c
create mode 100644 sysdeps/x86/tst-shstk-legacy-1a.c
create mode 100644 sysdeps/x86/tst-shstk-legacy-1b-static.c
create mode 100644 sysdeps/x86/tst-shstk-legacy-1b.c
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index ea45aad34c..dea14e343c 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -129,6 +129,21 @@ tests += tst-cet-legacy-1 tst-cet-legacy-1a tst-cet-legacy-2 \
tst-cet-legacy-10 tst-cet-legacy-10-static
tests-static += tst-cet-legacy-9-static tst-cet-legacy-10-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 tst-cet-legacy-4c \
tst-cet-legacy-5b tst-cet-legacy-6b
modules-names += tst-cet-legacy-mod-1 tst-cet-legacy-mod-2 \
@@ -168,6 +183,9 @@ 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 \
@@ -200,6 +218,11 @@ $(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.
diff --git a/sysdeps/x86/tst-shstk-legacy-1-extra.S b/sysdeps/x86/tst-shstk-legacy-1-extra.S
new file mode 100644
index 0000000000..f3adb9f639
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1-extra.S
@@ -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
diff --git a/sysdeps/x86/tst-shstk-legacy-1a-static.c b/sysdeps/x86/tst-shstk-legacy-1a-static.c
new file mode 100644
index 0000000000..dd549890a0
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1a-static.c
@@ -0,0 +1 @@
+#include "tst-shstk-legacy-1a.c"
diff --git a/sysdeps/x86/tst-shstk-legacy-1a.c b/sysdeps/x86/tst-shstk-legacy-1a.c
new file mode 100644
index 0000000000..c6f5810838
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1a.c
@@ -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>
diff --git a/sysdeps/x86/tst-shstk-legacy-1b-static.c b/sysdeps/x86/tst-shstk-legacy-1b-static.c
new file mode 100644
index 0000000000..4945344675
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1b-static.c
@@ -0,0 +1 @@
+#include "tst-shstk-legacy-1b.c"
diff --git a/sysdeps/x86/tst-shstk-legacy-1b.c b/sysdeps/x86/tst-shstk-legacy-1b.c
new file mode 100644
index 0000000000..05231e60ae
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1b.c
@@ -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>
--
2.40.1
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