Ruan Jinjie 952d1e4cbc riscv: fix kprobe __user string arg print fault issue ... [ Upstream commit 99a670b206 ] On riscv qemu platform, when add kprobe event on do_sys_open() to show filename string arg, it just print fault as follow: echo 'p:myprobe do_sys_open dfd=$arg1 filename=+0($arg2):string flags=$arg3 mode=$arg4' > kprobe_events bash-166 [000] ...1. 360.195367: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename=(fault) flags=0x8241 mode=0x1b6 bash-166 [000] ...1. 360.219369: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename=(fault) flags=0x8241 mode=0x1b6 bash-191 [000] ...1. 360.378827: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename=(fault) flags=0x98800 mode=0x0 As riscv do not select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE, the +0($arg2) addr is processed as a kernel address though it is a userspace address, cause the above filename=(fault) print. So select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE to avoid the issue, after that the kprobe trace is ok as below: bash-166 [000] ...1. 96.767641: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename="/dev/null" flags=0x8241 mode=0x1b6 bash-166 [000] ...1. 96.793751: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename="/dev/null" flags=0x8241 mode=0x1b6 bash-177 [000] ...1. 96.962354: myprobe: (do_sys_open+0x0/0x84) dfd=0xffffffffffffff9c filename="/sys/kernel/debug/tracing/events/kprobes/" flags=0x98800 mode=0x0 Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Acked-by: Björn Töpel <bjorn@rivosinc.com> Fixes: 0ebeea8ca8 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") Link: https://lore.kernel.org/r/20230504072910.3742842-1-ruanjinjie@huawei.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-06-14 11:13:09 +02:00
..
boot	riscv: dts: sifive: fu740: fix size of pcie 32bit memory	2023-01-24 07:22:46 +01:00
configs	RISC-V: defconfigs: Set CONFIG_FB=y, for FB console	2022-07-12 16:34:54 +02:00
errata	riscv: skip errata_cip_453.o if CONFIG_ERRATA_SIFIVE_CIP_453 is disabled	2021-06-01 21:16:41 -07:00
include	riscv: Move early dtb mapping into the fixmap region	2023-05-01 08:23:24 +09:00
kernel	riscv: Do not set initial_boot_params to the linear address of the dtb	2023-05-01 08:23:24 +09:00
lib	riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit	2022-08-31 17:16:36 +02:00
mm	riscv: Fix unused variable warning when BUILTIN_DTB is set	2023-06-09 10:32:15 +02:00
net	riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC	2022-12-31 13:14:16 +01:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: fix kprobe __user string arg print fault issue	2023-06-14 11:13:09 +02:00
Kconfig.debug
Kconfig.erratas	riscv: alternative only works on !XIP_KERNEL	2022-03-16 14:23:42 +01:00
Kconfig.socs	riscv: alternative only works on !XIP_KERNEL	2022-03-16 14:23:42 +01:00
Makefile	riscv: Handle zicsr/zifencei issues between clang and binutils	2023-03-30 12:47:59 +02:00