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riscv: Add support for function error injection
Inspired by the commit 42d038c4fb00 ("arm64: Add support for function error injection"), this patch supports function error injection for riscv. This patch mainly support two functions: one is regs_set_return_value() which is used to overwrite the return value; the another function is override_function_with_return() which is to override the probed function returning and jump to its caller. Test log: cd /sys/kernel/debug/fail_function echo sys_clone > inject echo 100 > probability echo 1 > interval ls / [ 313.176875] FAULT_INJECTION: forcing a failure. [ 313.176875] name fail_function, interval 1, probability 100, space 0, times 1 [ 313.184357] CPU: 0 PID: 87 Comm: sh Not tainted 5.8.0-rc5-00007-g6a758cc #117 [ 313.187616] Call Trace: [ 313.189100] [<ffffffe0002036b6>] walk_stackframe+0x0/0xc2 [ 313.191626] [<ffffffe00020395c>] show_stack+0x40/0x4c [ 313.193927] [<ffffffe000556c60>] dump_stack+0x7c/0x96 [ 313.194795] [<ffffffe0005522e8>] should_fail+0x140/0x142 [ 313.195923] [<ffffffe000299ffc>] fei_kprobe_handler+0x2c/0x5a [ 313.197687] [<ffffffe0009e2ec4>] kprobe_breakpoint_handler+0xb4/0x18a [ 313.200054] [<ffffffe00020357e>] do_trap_break+0x36/0xca [ 313.202147] [<ffffffe000201bca>] ret_from_exception+0x0/0xc [ 313.204556] [<ffffffe000201bbc>] ret_from_syscall+0x0/0x2 -sh: can't fork: Invalid argument Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Palmer Dabbelt <palmerdabbelt@google.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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@ -67,6 +67,7 @@ config RISCV
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DMA_CONTIGUOUS if MMU
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select HAVE_EBPF_JIT if MMU
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select HAVE_FUNCTION_ERROR_INJECTION
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select HAVE_FUTEX_CMPXCHG if FUTEX
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select HAVE_GCC_PLUGINS
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select HAVE_GENERIC_VDSO if MMU && 64BIT
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@ -109,6 +109,12 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
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return regs->a0;
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}
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static inline void regs_set_return_value(struct pt_regs *regs,
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unsigned long val)
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{
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regs->a0 = val;
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}
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extern int regs_query_register_offset(const char *name);
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extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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unsigned int n);
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@ -5,3 +5,5 @@ lib-y += memset.o
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lib-y += memmove.o
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lib-$(CONFIG_MMU) += uaccess.o
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lib-$(CONFIG_64BIT) += tishift.o
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obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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10
arch/riscv/lib/error-inject.c
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10
arch/riscv/lib/error-inject.c
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@ -0,0 +1,10 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/error-injection.h>
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#include <linux/kprobes.h>
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void override_function_with_return(struct pt_regs *regs)
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{
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instruction_pointer_set(regs, regs->ra);
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}
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NOKPROBE_SYMBOL(override_function_with_return);
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