linux/arch
Guo Ren 71e193d7cb csky: 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
csky.

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 /
[  108.644163] FAULT_INJECTION: forcing a failure.
[  108.644163] name fail_function, interval 1, probability 100, space 0, times 1
[  108.647799] CPU: 0 PID: 104 Comm: sh Not tainted 5.8.0-rc5+ #46
[  108.648384] Call Trace:
[  108.649339] [<8005eed4>] walk_stackframe+0x0/0xf0
[  108.649679] [<8005f16a>] show_stack+0x32/0x5c
[  108.649927] [<8040f9d2>] dump_stack+0x6e/0x9c
[  108.650271] [<80406f7e>] should_fail+0x15e/0x1ac
[  108.650720] [<80118ba8>] fei_kprobe_handler+0x28/0x5c
[  108.651519] [<80754110>] kprobe_breakpoint_handler+0x144/0x1cc
[  108.652289] [<8005d6da>] trap_c+0x8e/0x110
[  108.652816] [<8005ce8c>] csky_trap+0x5c/0x70
-sh: can't fork: Invalid argument

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
2020-07-31 01:52:07 +00:00
..
alpha Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
arc ARCv2: support loop buffer (LPB) disabling 2020-06-18 13:07:24 -07:00
arm ARM: SoC fixes for v5.8 2020-07-17 15:38:22 -07:00
arm64 Various EFI fixes: 2020-07-25 13:18:42 -07:00
c6x This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
csky csky: Add support for function error injection 2020-07-31 01:52:07 +00:00
h8300 This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
hexagon treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
ia64 Merge branch 'hch' (maccess patches from Christoph Hellwig) 2020-06-18 12:35:51 -07:00
m68k m68k: mm: fix node memblock init 2020-06-29 23:58:05 +10:00
microblaze mmap locking API: convert mmap_sem comments 2020-06-09 09:39:14 -07:00
mips Two fixes for the interrupt subsystem: 2020-07-19 11:53:08 -07:00
nds32 maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
nios2 nios2 update for v5.8-rc1 2020-06-12 11:55:11 -07:00
openrisc openrisc: fix boot oops when DEBUG_VM is enabled 2020-06-26 00:27:36 -07:00
parisc parisc: Add atomic64_set_release() define to avoid CPU soft lockups 2020-07-21 17:16:37 +02:00
powerpc powerpc/vas: Report proper error code for address translation failure 2020-07-15 23:09:55 +10:00
riscv riscv: Parse all memory blocks to remove unusable memory 2020-07-24 22:08:25 -07:00
s390 s390/cpum_cf,perf: change DFLT_CCERROR counter name 2020-07-21 13:53:56 +02:00
sh maccess: rename probe_kernel_address to get_kernel_nofault 2020-06-18 11:14:40 -07:00
sparc treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
um maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
unicore32 This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
x86 Misc fixes: 2020-07-25 14:25:47 -07:00
xtensa Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs into master 2020-07-24 14:19:00 -07:00
.gitignore
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00