riscv: kprobes: allow writing to x0
authorNam Cao <namcaov@gmail.com>
Tue, 29 Aug 2023 18:25:00 +0000 (20:25 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 28 Nov 2023 17:20:13 +0000 (17:20 +0000)
commitb59f21292e1858477d4007d9645678b88ae17abf
tree1a05b8997ef83cbd4a93cfb4b494791406e91fc6
parent2c8b096a575000605da454d498369f5e15e9739b
riscv: kprobes: allow writing to x0

commit 8cb22bec142624d21bc85ff96b7bad10b6220e6a upstream.

Instructions can write to x0, so we should simulate these instructions
normally.

Currently, the kernel hangs if an instruction who writes to x0 is
simulated.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Nam Cao <namcaov@gmail.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Acked-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20230829182500.61875-1-namcaov@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/riscv/kernel/probes/simulate-insn.c