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Stackwalk can't recover caller's register X30($LR) value by STACK CFI info.
This will lead unwinding stop immediately when fallback to frame pointer unwinder.
This PR will use try to use second last frame to recover register X30($LR) by frame pointer.
And we will give up correction if STACK CFI info doesn't agree with frame pointer info.
Bug: https://bugs.chromium.org/p/google-breakpad/issues/detail?id=808
Change-Id: I50649e3398e268b02ff297e83db21d05705c2a2d
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1992641
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
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Pointer authentication codes are used to validate pointers against
accidental or malicious modification by storing a hash of the address
and a secret value in the pointer's unused, upper bits. The exact
bits used may vary by implementation and depend on the size of the
virtual address space of the target system, and whether other tagged
pointer features are in use.
Apple has implemented PACs in the Apple A12.
https://developer.apple.com/documentation/security/preparing_your_app_to_work_with_pointer_authentication
The documented method of stripping PACs from a pointer is to call
ptrauth_strip(), which ultimately emits an `xpaci` instruction, but
this option isn't available to the Breakpad processor not running on
the device. Instead, this patch selects likely address bits from
link register values by examining the address range of loaded modules.
Change-Id: I054bd1a03605719937fc85dcc8d8b9fe927f44be
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1713650
Reviewed-by: Mark Mentovai <mark@chromium.org>
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This struct matches the layout defined by Microsoft and replaces
Breakpad's MDRawContextARM64_Old. This CL updates the processor to
understand either the old or new structs, but clients continue to write
the old structs.
Change-Id: I8dedd9ddb2ec083b802723b9ac87beb18d98edbd
Reviewed-on: https://chromium-review.googlesource.com/1155938
Reviewed-by: Mark Mentovai <mark@chromium.org>
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This makes way for the addition of a struct matching Microsoft's layout
for ARM64.
Change-Id: I115f25290863e7438852691d1ec3c9324a42f7a5
Reviewed-on: https://chromium-review.googlesource.com/1152158
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
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This CL adds CFI based stack walking support for Arm64 to BreakPad along with
unit tests. The Arm64 CFI stack walker is based on the Arm CFI stack walker
BUG=367367,335641,354405
R=blundell@chromium.org, mark@chromium.org
Review URL: https://breakpad.appspot.com/1664002
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1325 4c0a9323-5329-0410-9bdc-e9ce6186880e
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Patch by Colin Blundell <blundell@chromium.org>
BUG=542
Review URL: https://breakpad.appspot.com/704002/
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1236 4c0a9323-5329-0410-9bdc-e9ce6186880e
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