Guo Ren ee55ff803b riscv: Add support for function error injection ... Inspired by the commit 42d038c4fb ("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>		2021-01-14 15:09:09 -08:00
..
Makefile	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
delay.c	riscv: delay: use do_div() instead of __udivdi3()	2019-08-08 16:05:38 -07:00
error-inject.c	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
memcpy.S	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
memmove.S	riscv: provide memmove implementation	2020-12-10 17:27:54 -08:00
memset.S	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
tishift.S	riscv: Less inefficient gcc tishift helpers (and export their symbols)	2020-01-18 19:13:41 -08:00
uaccess.S	RISC-V: Stop using LOCAL for the uaccess fixups	2020-03-03 10:45:14 -08:00