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authorGuo Ren <guoren@linux.alibaba.com>2023-02-04 01:35:31 -0500
committerPalmer Dabbelt <palmer@rivosinc.com>2023-02-09 11:34:29 -0800
commiteb7423273cc9922ee2d05bf660c034d7d515bb91 (patch)
tree39b6c7b9d14edef8563ef2ef89985613bcea18f5
parentcb80242cc679d6397e77d8a964deeb3ff218d2b5 (diff)
riscv: kprobe: Fixup misaligned load text
The current kprobe would cause a misaligned load for the probe point. This patch fixup it with two half-word loads instead. Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported") Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/linux-riscv/878rhig9zj.fsf@all.your.base.are.belong.to.us/ Reported-by: Bjorn Topel <bjorn.topel@gmail.com> Reviewed-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/r/20230204063531.740220-1-guoren@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
-rw-r--r--arch/riscv/kernel/probes/kprobes.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index 41c7481afde3..2bedec37d092 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -65,16 +65,18 @@ static bool __kprobes arch_check_kprobe(struct kprobe *p)
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
- unsigned long probe_addr = (unsigned long)p->addr;
+ u16 *insn = (u16 *)p->addr;
- if (probe_addr & 0x1)
+ if ((unsigned long)insn & 0x1)
return -EILSEQ;
if (!arch_check_kprobe(p))
return -EILSEQ;
/* copy instruction */
- p->opcode = *p->addr;
+ p->opcode = (kprobe_opcode_t)(*insn++);
+ if (GET_INSN_LENGTH(p->opcode) == 4)
+ p->opcode |= (kprobe_opcode_t)(*insn) << 16;
/* decode instruction */
switch (riscv_probe_decode_insn(p->addr, &p->ainsn.api)) {