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| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-07-10 15:01:19 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-07-22 10:33:42 +0100 |
| commit | 85751e9e5b1480fc675106aeaf94fadb8028469b (patch) | |
| tree | 1e957c725006511faccf784b35e7d16319678102 /arch/arm64/kernel | |
| parent | 5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff) | |
| download | linux-85751e9e5b1480fc675106aeaf94fadb8028469b.tar.bz2 | |
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>
Diffstat (limited to 'arch/arm64/kernel')
0 files changed, 0 insertions, 0 deletions