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x86/elf: Use e_machine to choose DLINFO in compat 

Since TIF_X32 is going away, avoid using it to find the ELF type on
ARCH_DLINFO.

According to SysV AMD64 ABI Draft, an AMD64 ELF object using ILP32 must
have ELFCLASS32 with (E_MACHINE == EM_X86_64), so use that ELF field to
differentiate a x32 object from a IA32 object when loading ARCH_DLINFO in
compat mode.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20201004032536.1229030-5-krisman@collabora.com
This commit is contained in:
Gabriel Krisman Bertazi 2020-10-03 23:25:30 -04:00 committed by Thomas Gleixner
parent 47cd4dac1f
commit 2656af0d5a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/elf.h
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@ -361,7 +361,7 @@ do { \
#define AT_SYSINFO 32
#define COMPAT_ARCH_DLINFO \
if (test_thread_flag(TIF_X32)) \
if (exec->e_machine == EM_X86_64) \
ARCH_DLINFO_X32; \
else \
ARCH_DLINFO_IA32