kernel.git/arch/riscv/kernel/probes, branch linux-6.19.y

riscv: kprobes: Fix probe address validation

2025-10-10T01:36:45Z

When adding a kprobe such as "p:probe/tcp_sendmsg _text+15392192", arch_check_kprobe would start iterating all instructions starting from _text until the probed address. Not only is this very inefficient, but literal values in there (e.g. left by function patching) are misinterpreted in a way that causes a desync. Fix this by doing it like x86: start the iteration at the closest preceding symbol instead of the given starting point. Fixes: 87f48c7ccc73 ("riscv: kprobe: Fixup kernel panic when probing an illegal position") Signed-off-by: Fabian Vogt Signed-off-by: Marvin Friedrich Acked-by: Guo Ren Link: https://lore.kernel.org/r/6191817.lOV4Wx5bFT@fvogt-thinkpad Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_ITYPE_IMM

2025-09-17T00:46:44Z

Use RV_EXTRACT_ITYPE_IMM, instead of re-implementing it in simulate_jalr(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/8ae34e966c312ae5cf6c09a35ddc290cce942208.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_UTYPE_IMM

2025-09-17T00:46:44Z

Use RV_EXTRACT_UTYPE_IMM, instead of reimplementing it in simulate_auipc(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/8f0defce9f1f23f1b44bb9750ed083cfc124213c.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_RD_REG

2025-09-17T00:46:44Z

Use RV_EXTRACT_RD_REG, instead of reimplementing its code. Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/b31e5b41df5839a76103348e54dc034c8a43447a.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RVC_EXTRACT_BTYPE_IMM

2025-09-17T00:46:44Z

Use RVC_EXTRACT_BTYPE_IMM, instead of reimplementing it in simulate_c_bnez_beqz(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/8a8ed970f279fa5f24c90d840c2130e37bc6d16e.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RVC_EXTRACT_C2_RS1_REG

2025-09-17T00:46:44Z

Use RVC_EXTRACT_C2_RS1_REG, instead of reimplementing it in simulate_c_jr_jalr(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/d56955cd683411c6d2f63d13c78e0572462a3269.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RVC_EXTRACT_JTYPE_IMM

2025-09-17T00:46:44Z

Use RVC_EXTRACT_JTYPE_IMM, instead of reimplementing it in simulate_c_j(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/24497deaab06d6b12cb84923606ec26f67e25424.1747215274.git.namcao@linutronix.de/ [pjw@kernel.org: fixed subject line typo] Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_BTYPE_IMM

2025-09-17T00:46:44Z

Use RV_EXTRACT_BTYPE_IMM, instead of reimplementing it in simulate_branch(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/b441038c991da11a7a48ea7140ab00e3bb119387.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_RS1_REG

2025-09-17T00:46:44Z

Use RV_EXTRACT_RS1_REG instead of reimplementing its code. Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/b441038c991da11a7a48ea7140ab00e3bb119387.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley

riscv: kprobes: Remove duplication of RV_EXTRACT_JTYPE_IMM

2025-09-17T00:46:43Z

Use RV_EXTRACT_JTYPE_IMM, instead of reimplementing it in simulate_jal(). Signed-off-by: Nam Cao Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/linux-riscv/af502036738d381c6bdb96a236d21bab8c343f74.1747215274.git.namcao@linutronix.de/ Signed-off-by: Paul Walmsley