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arm64: Add Armv8.3-A PAC support to assembly files

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This patch adds optional support for Arm Pointer Authentication Codes.

X30/LR is not stored to stack at any place and restored for usage.
Therefore only adding PAC flag to .note.gnu.property section.

Change-Id: I9581059dfa1eed88af5a73df15b6a0d299caea13
Bug: crashpad: 1145581
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3440070
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
This commit is contained in:
André Kempe 2022-02-08 08:14:02 +00:00 committed by Crashpad LUCI CQ
parent d464981876
commit 45cc0da93a
5 changed files with 41 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
client/crashpad_info_note.S
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@ -17,7 +17,7 @@
// that symbol to be in the dynamic symbol table.
#include "util/misc/elf_note_types.h"
#include "util/misc/arm64_bti_note.S"
#include "util/misc/arm64_pac_bti.S"
// namespace crashpad {
// CrashpadInfo g_crashpad_info;

2
snapshot/crashpad_info_size_test_note.S
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@ -17,7 +17,7 @@
// that symbol to be in the dynamic symbol table.
#include "util/misc/elf_note_types.h"
#include "util/misc/arm64_bti_note.S"
#include "util/misc/arm64_pac_bti.S"
// namespace crashpad {
// CrashpadInfo g_test_crashpad_info;

2
snapshot/elf/elf_image_reader_test_note.S
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@ -13,7 +13,7 @@
// limitations under the License.
#include "util/misc/elf_note_types.h"
#include "util/misc/arm64_bti_note.S"
#include "util/misc/arm64_pac_bti.S"
#define NOTE_ALIGN 4
.section .note.crashpad.test,"a",%note

49
util/misc/arm64_bti_note.S → util/misc/arm64_pac_bti.S
View File

@ -12,16 +12,40 @@
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S
#define CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S
#ifndef CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S
#define CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S
/* Support macros for the Armv8.5-A Branch Target Identification feature which
* requires emitting a .note.gnu.property section with the appropriate
/* Support macros for the Armv8.5-A Branch Target Identification and
* Armv8.3-A Pointer Authentication features which require emitting
* a .note.gnu.property section with the appropriate
* architecture-dependent feature bits set.
* Read more: "ELF for the Arm® 64-bit Architecture"
*/
#if defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1)
#define GNU_PROPERTY_AARCH64_BTI (1 << 0) // Has BTI
#define GNU_PROPERTY_AARCH64_BTI 1 // Has BTI
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET bti jc
#define CRASHPAD_AARCH64_VALID_CALL_TARGET bti c
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET bti j
#else
#define GNU_PROPERTY_AARCH64_BTI 0 // No BTI
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET
#define CRASHPAD_AARCH64_VALID_CALL_TARGET
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET
#endif
#if defined(__ARM_FEATURE_PAC_DEFAULT)
#if ((__ARM_FEATURE_PAC_DEFAULT & ((1<<0)|(1<<2))) == 0)
#error Pointer authentication defines no valid key!
#endif
#define GNU_PROPERTY_AARCH64_PAC 1 // Has PAC
#else
#define GNU_PROPERTY_AARCH64_PAC 0 // No PAC
#endif
/**
* Emit a proper .note.gnu.property section in case of PAC or BTI being enabled.
*/
#if (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0)
.pushsection .note.gnu.property, "a"
.balign 4
.long 0x4 /* size of field "GNU" */
@ -30,17 +54,12 @@
.asciz "GNU"
.long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
.long 0x4
.long GNU_PROPERTY_AARCH64_BTI
.long ((GNU_PROPERTY_AARCH64_BTI<<0)|(GNU_PROPERTY_AARCH64_PAC<<1))
.long 0x0
.popsection
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET bti jc
#define CRASHPAD_AARCH64_VALID_CALL_TARGET bti c
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET bti j
#undef GNU_PROPERTY_AARCH64_BTI
#else
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET
#define CRASHPAD_AARCH64_VALID_CALL_TARGET
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET
#endif
#endif /* CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S */
#undef GNU_PROPERTY_AARCH64_BTI
#undef GNU_PROPERTY_AARCH64_PAC
#endif /* CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S */

7
util/misc/capture_context_linux.S
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@ -12,7 +12,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util/misc/arm64_bti_note.S"
#include "util/misc/arm64_pac_bti.S"
// namespace crashpad {
// void CaptureContext(ucontext_t* context);
@ -316,14 +316,15 @@ CAPTURECONTEXT_SYMBOL2:
stp x26, x27, [x0, #0x188]
stp x28, x29, [x0, #0x198]
// The original LR can't be recovered.
// The original LR can't be recovered, therefore no need to sign x30 with PAC.
str x30, [x0, #0x1a8]
// Use x1 as a scratch register.
mov x1, SP
str x1, [x0, #0x1b0] // context->uc_mcontext.sp
// The link register holds the return address for this function.
// The link register holds the return address for this function and won't be
// recovered, therefore no need to sign x30 with PAC.
str x30, [x0, #0x1b8] // context->uc_mcontext.pc
// pstate should hold SPSR but NZCV are the only bits we know about.