diff options
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/lib/error-inject.c | 19 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index f23934bbaf4e..25a972c61b0a 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -26,6 +26,7 @@ lib-y += memcpy_$(BITS).o lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o lib-$(CONFIG_INSTRUCTION_DECODER) += insn.o inat.o insn-eval.o lib-$(CONFIG_RANDOMIZE_BASE) += kaslr.o +lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o lib-$(CONFIG_RETPOLINE) += retpoline.o obj-y += msr.o msr-reg.o msr-reg-export.o hweight.o diff --git a/arch/x86/lib/error-inject.c b/arch/x86/lib/error-inject.c new file mode 100644 index 000000000000..7b881d03d0dd --- /dev/null +++ b/arch/x86/lib/error-inject.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/error-injection.h> +#include <linux/kprobes.h> + +asmlinkage void just_return_func(void); + +asm( + ".type just_return_func, @function\n" + "just_return_func:\n" + " ret\n" + ".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); |