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x86/entry: Compile entry_SYSCALL32_ignore() unconditionally

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To limit the IA32 exposure on 64bit kernels while keeping the
flexibility for the user to enable it when required, the compile time
enable/disable via CONFIG_IA32_EMULATION is not good enough and will
be complemented with a kernel command line option.

Right now entry_SYSCALL32_ignore() is only compiled when
CONFIG_IA32_EMULATION=n, but boot-time enable- / disablement obviously
requires it to be unconditionally available.

Remove the #ifndef CONFIG_IA32_EMULATION guard.

Signed-off-by: Nikolay Borisov <nik.borisov@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230623111409.3047467-4-nik.borisov@suse.com
This commit is contained in:
Nikolay Borisov 2023-06-23 14:14:06 +03:00 committed by Thomas Gleixner
parent f71e1d2ff8
commit 370dcd5854
1 changed files with 0 additions and 2 deletions
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2
arch/x86/entry/entry_64.S
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@ -1511,7 +1511,6 @@ nmi_restore:
iretq
SYM_CODE_END(asm_exc_nmi)
#ifndef CONFIG_IA32_EMULATION
/*
* This handles SYSCALL from 32-bit code. There is no way to program
* MSRs to fully disable 32-bit SYSCALL.
@ -1522,7 +1521,6 @@ SYM_CODE_START(entry_SYSCALL32_ignore)
mov $-ENOSYS, %eax
sysretl
SYM_CODE_END(entry_SYSCALL32_ignore)
#endif
.pushsection .text, "ax"
__FUNC_ALIGN