Messages in this thread Patch in this message | | | Date | Mon, 26 Oct 2020 12:52:36 -0000 | From | "tip-bot2 for Gabriel Krisman Bertazi" <> | Subject | [tip: x86/cleanups] x86/elf: Use e_machine to choose DLINFO in compat |
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The following commit has been merged into the x86/cleanups branch of tip:
Commit-ID: 2656af0d5abfa26d7f1e40f92e9953fe155b950a Gitweb: https://git.kernel.org/tip/2656af0d5abfa26d7f1e40f92e9953fe155b950a Author: Gabriel Krisman Bertazi <krisman@collabora.com> AuthorDate: Sat, 03 Oct 2020 23:25:30 -04:00 Committer: Thomas Gleixner <tglx@linutronix.de> CommitterDate: Mon, 26 Oct 2020 13:46:46 +01:00
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
--- arch/x86/include/asm/elf.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index b9a5d48..9220efc 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -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
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