Commits
Vincenzo Frascino committed 85751e9e5b1
arm64: vdso: Fix population of AT_SYSINFO_EHDR for compat vdso Prior to the introduction of Unified vDSO support and compat layer for vDSO on arm64, AT_SYSINFO_EHDR was not defined for compat tasks. In the current implementation, AT_SYSINFO_EHDR is defined even if the compat vdso layer is not built, which has been shown to break Android applications using bionic: | 01-01 01:22:14.097 755 755 F libc : Fatal signal 11 (SIGSEGV), | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 755 (cameraserver), | pid 755 (cameraserver) | 01-01 01:22:14.112 759 759 F libc : Fatal signal 11 (SIGSEGV), | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 759 | (android.hardwar), pid 759 (android.hardwar) | 01-01 01:22:14.120 756 756 F libc : Fatal signal 11 (SIGSEGV) | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 756 (drmserver), | pid 756 (drmserver) Restore the old behaviour by making sure that AT_SYSINFO_EHDR for compat tasks is defined only when CONFIG_COMPAT_VDSO is enabled. Reported-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Will Deacon <will@kernel.org>