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Subject[PATCH v2] arm64: vdso: Fix ABI regression in compat vdso
Date
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 and this causes a regression in the
expected behavior of the ABI.

Restore the ABI behavior 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>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
arch/arm64/include/asm/elf.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
index 3c7037c6ba9b..b618017205a3 100644
--- a/arch/arm64/include/asm/elf.h
+++ b/arch/arm64/include/asm/elf.h
@@ -202,7 +202,7 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
({ \
set_thread_flag(TIF_32BIT); \
})
-#ifdef CONFIG_GENERIC_COMPAT_VDSO
+#ifdef CONFIG_COMPAT_VDSO
#define COMPAT_ARCH_DLINFO \
do { \
/* \
--
2.22.0
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