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Message-ID: <160371675483.397.13437948801906513925.tip-bot2@tip-bot2>
Date: Mon, 26 Oct 2020 12:52:34 -0000
From: "tip-bot2 for Gabriel Krisman Bertazi" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Gabriel Krisman Bertazi <krisman@...labora.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Lutomirski <luto@...nel.org>, x86 <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/cleanups] x86/elf: Use e_machine to select start_thread for x32
The following commit has been merged into the x86/cleanups branch of tip:
Commit-ID: 2424b14605c71a7187c14edd525044eb36bdea47
Gitweb: https://git.kernel.org/tip/2424b14605c71a7187c14edd525044eb36bdea47
Author: Gabriel Krisman Bertazi <krisman@...labora.com>
AuthorDate: Sat, 03 Oct 2020 23:25:32 -04:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 26 Oct 2020 13:46:46 +01:00
x86/elf: Use e_machine to select start_thread for x32
Since TIF_X32 is going away, avoid using it to find the ELF type in
compat_start_thread.
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 executing start_thread()
in compat mode.
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Andy Lutomirski <luto@...nel.org>
Link: https://lore.kernel.org/r/20201004032536.1229030-7-krisman@collabora.com
---
arch/x86/include/asm/elf.h | 5 +++--
arch/x86/kernel/process_64.c | 5 ++---
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 9220efc..109697a 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -186,8 +186,9 @@ static inline void elf_common_init(struct thread_struct *t,
#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
elf_common_init(¤t->thread, regs, __USER_DS)
-void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp);
-#define compat_start_thread compat_start_thread
+void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32);
+#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
+ compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64)
void set_personality_ia32(bool);
#define COMPAT_SET_PERSONALITY(ex) \
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index df342be..5fb4103 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -511,11 +511,10 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
EXPORT_SYMBOL_GPL(start_thread);
#ifdef CONFIG_COMPAT
-void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp)
+void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32)
{
start_thread_common(regs, new_ip, new_sp,
- test_thread_flag(TIF_X32)
- ? __USER_CS : __USER32_CS,
+ x32 ? __USER_CS : __USER32_CS,
__USER_DS, __USER_DS);
}
#endif
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