linux-stable/arch/x86/lib/error-inject.c
Peter Zijlstra b17c2baa30 x86: Prepare inline-asm for straight-line-speculation
Replace all ret/retq instructions with ASM_RET in preparation of
making it more than a single instruction.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211204134907.964635458@infradead.org
2021-12-08 19:23:12 +01:00

22 lines
492 B
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/linkage.h>
#include <linux/error-injection.h>
#include <linux/kprobes.h>
asmlinkage void just_return_func(void);
asm(
".text\n"
".type just_return_func, @function\n"
".globl just_return_func\n"
"just_return_func:\n"
ASM_RET
".size just_return_func, .-just_return_func\n"
);
void override_function_with_return(struct pt_regs *regs)
{
regs->ip = (unsigned long)&just_return_func;
}
NOKPROBE_SYMBOL(override_function_with_return);