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`strip_pac()` only strips with a mask, and nothing sets one. The `__bionic_clear_pac_bits()` fallback was compiled out because it is not in the NDK, so a signed return address ended the unwind. Strip with `xpaclri` like bionic does, spelled as `hint #7` for assemblers without Armv8.3-A support. It is a NOP on older CPUs. Pixel 8 Pro (Tensor G3, Android 17), `abort()` through two `-mbranch-protection=pac-ret` functions, unwound from a SIGABRT handler like sentry-native's inproc backend. Before: #00 pc 000000000007fdc0 .../libc.so (abort+160) #1 pc 006e8cdf7ce216d0 <unknown> After: #00 pc 000000000007fdc0 .../libc.so (abort+160) #1 pc 000000000002867c .../pac_test (pac_crash()+12) #2 pc 000000000002868c .../pac_test (pac_caller()+12) #3 pc 0000000000028708 .../pac_test (main+120) #4 pc 000000000007183c .../libc.so (__libc_init+124) Ref: getsentry/sentry-native#2258
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Superseded by #12 |
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strip_pac()only strips with a mask, and nothing sets one. The__bionic_clear_pac_bits()fallback was compiled out because it is not in the NDK, so a signed return address ended the unwind. Strip withxpaclrilike bionic does, spelled ashint #7for assemblers without Armv8.3-A support. It is a NOP on older CPUs.Verified locally on a Pixel 8 Pro (Tensor G3, Android 17),
abort()through two-mbranch-protection=pac-retfunctions, unwound from a SIGABRT handler like sentry-native's inproc backend.Before:
After:
Ref: getsentry/sentry-native#2258