Björn Töpel b2d473a601 riscv, kprobes: Stricter c.jr/c.jalr decoding ... In the compressed instruction extension, c.jr, c.jalr, c.mv, and c.add is encoded the following way (each instruction is 16b): ---+-+-----------+-----------+-- 100 0 rs1[4:0]!=0 00000 10 : c.jr 100 1 rs1[4:0]!=0 00000 10 : c.jalr 100 0 rd[4:0]!=0 rs2[4:0]!=0 10 : c.mv 100 1 rd[4:0]!=0 rs2[4:0]!=0 10 : c.add The following logic is used to decode c.jr and c.jalr: insn & 0xf007 == 0x8002 => instruction is an c.jr insn & 0xf007 == 0x9002 => instruction is an c.jalr When 0xf007 is used to mask the instruction, c.mv can be incorrectly decoded as c.jr, and c.add as c.jalr. Correct the decoding by changing the mask from 0xf007 to 0xf07f. Fixes: c22b0bcb1d ("riscv: Add kprobes supported") Signed-off-by: Björn Töpel <bjorn@rivosinc.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/20230102160748.1307289-1-bjorn@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2023-01-05 12:30:41 -08:00
..
Makefile	riscv: add riscv rethook implementation	2022-12-02 13:04:05 -08:00
decode-insn.c	riscv: kprobes: implement the branch instructions	2021-07-21 23:22:34 -07:00
decode-insn.h	…
ftrace.c	ftrace: disable preemption when recursion locked	2021-10-27 11:21:49 -04:00
kprobes.c	riscv: add riscv rethook implementation	2022-12-02 13:04:05 -08:00
rethook.c	riscv: add riscv rethook implementation	2022-12-02 13:04:05 -08:00
rethook.h	riscv: add riscv rethook implementation	2022-12-02 13:04:05 -08:00
rethook_trampoline.S	riscv: add riscv rethook implementation	2022-12-02 13:04:05 -08:00
simulate-insn.c	riscv: kprobes: implement the branch instructions	2021-07-21 23:22:34 -07:00
simulate-insn.h	riscv, kprobes: Stricter c.jr/c.jalr decoding	2023-01-05 12:30:41 -08:00
uprobes.c	riscv:uprobe fix SR_SPIE set/clear handling	2022-08-11 14:14:52 -07:00