linux-kernel - [PATCH v3 4/5] x86/elf: Make loading of 32bit processes depend on ia32

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Message-Id: <20230616125730.1164989-5-nik.borisov@suse.com>
Date:   Fri, 16 Jun 2023 15:57:29 +0300
From:   Nikolay Borisov <nik.borisov@...e.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, mhocko@...e.com, jslaby@...e.cz,
        Nikolay Borisov <nik.borisov@...e.com>
Subject: [PATCH v3 4/5] x86/elf: Make loading of 32bit processes depend on ia32_enabled()

Major aspect of ia32 emulation is the ability to load 32bit processes.
That's currently decided (among others) by compat_elf_check_arch().

Make this macro also consider the runtime state of ia32 emulation before
allowing to load a 32bit process.

Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
---
 arch/x86/include/asm/elf.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 18fd06f7936a..a0234dfd1031 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -7,6 +7,7 @@
  */
 #include <linux/thread_info.h>
 
+#include <asm/ia32.h>
 #include <asm/ptrace.h>
 #include <asm/user.h>
 #include <asm/auxvec.h>
@@ -149,7 +150,7 @@ do {						\
 	((x)->e_machine == EM_X86_64)
 
 #define compat_elf_check_arch(x)					\
-	(elf_check_arch_ia32(x) ||					\
+	((elf_check_arch_ia32(x) && ia32_enabled()) ||			\
 	 (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
 
 static inline void elf_common_init(struct thread_struct *t,
-- 
2.34.1