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x86/ia32: State that IA32 emulation is disabled

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Issue a short message once, on the first try to load a 32-bit process to
save people time when wondering why it won't load and trying to execute
it, would say:

  -bash: ./strsep32: cannot execute binary file: Exec format error

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20231130155213.1407-1-bp@alien8.de
This commit is contained in:
Borislav Petkov (AMD) 2023-11-30 16:39:33 +01:00
parent 79c603ee43
commit f789383fa3
2 changed files with 11 additions and 2 deletions
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2
arch/x86/include/asm/elf.h
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@ -150,7 +150,7 @@ do { \
((x)->e_machine == EM_X86_64)
#define compat_elf_check_arch(x) \
((elf_check_arch_ia32(x) && ia32_enabled()) || \
((elf_check_arch_ia32(x) && ia32_enabled_verbose()) || \
(IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
static inline void elf_common_init(struct thread_struct *t,

11
arch/x86/include/asm/ia32.h
View file

@ -2,7 +2,6 @@
#ifndef _ASM_X86_IA32_H
#define _ASM_X86_IA32_H
#ifdef CONFIG_IA32_EMULATION
#include <linux/compat.h>
@ -84,4 +83,14 @@ static inline bool ia32_enabled(void)
#endif
static inline bool ia32_enabled_verbose(void)
{
bool enabled = ia32_enabled();
if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
return enabled;
}
#endif /* _ASM_X86_IA32_H */