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linux-stable/arch/riscv/kernel
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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
..
compat_vdso riscv: compat: vdso: Add COMPAT_VDSO base code implementation 2022-04-26 13:36:53 -07:00
probes riscv, kprobes: Stricter c.jr/c.jalr decoding 2023-01-05 12:30:41 -08:00
vdso riscv: vdso: fix section overlapping under some conditions 2022-11-29 18:45:53 -08:00
.gitignore
…
Makefile RISC-V: Add arch_crash_save_vmcoreinfo support 2022-12-02 16:48:22 -08:00
alternative.c riscv: make patch-function pointer more generic in cpu_manufacturer_info struct 2022-06-16 15:47:40 -07:00
asm-offsets.c RISC-V: Add arch functions for non-retentive suspend entry/exit 2022-03-10 09:29:31 -08:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
compat_signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
compat_syscall_table.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
cpu-hotplug.c riscv: cpu-hotplug: clear cpu from numa map when teardown 2022-02-10 09:16:50 -08:00
cpu.c RISC-V Patches for the 6.2 Merge Window, Part 1 2022-12-14 15:23:49 -08:00
cpu_ops.c riscv: ensure cpu_ops_sbi is declared 2022-08-11 13:46:51 -07:00
cpu_ops_sbi.c riscv: cpu_ops_sbi: Add 64bit hartid support on RV64 2022-07-19 16:38:58 -07:00
cpu_ops_spinwait.c RISC-V: cpu_ops_spinwait.c should include head.h 2022-08-11 13:24:16 -07:00
cpufeature.c RISC-V: Ensure Zicbom has a valid block size 2022-12-09 19:12:52 -08:00
crash_core.c RISC-V: Add arch_crash_save_vmcoreinfo support 2022-12-02 16:48:22 -08:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
crash_save_regs.S RISC-V: Fixup get incorrect user mode PC for kernel mode regs 2022-08-11 08:54:40 -07:00
efi-header.S RISC-V: Add PE/COFF header for EFI stub 2020-10-02 14:31:16 -07:00
efi.c riscv: read-only pages should not be writable 2022-05-28 11:39:31 +02:00
elf_kexec.c RISC-V: kexec: Fix memory leak of elf header buffer 2022-12-05 10:59:58 -08:00
entry.S Merge patch series "RISC-V: Align the shadow stack" 2022-12-12 09:30:37 -08:00
fpu.S
…
ftrace.c ftrace: Remove return value of ftrace_arch_modify_*() 2022-05-26 21:13:00 -04:00
head.S riscv: Initialize thread pointer before calling C functions 2022-06-01 21:46:23 -07:00
head.h RISC-V: Move spinwait booting method to its own config 2022-01-20 09:27:16 -08:00
image-vars.h efi: libstub: Provide local implementations of strrchr() and memchr() 2022-11-09 12:42:02 +01:00
irq.c
…
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kexec_relocate.S riscv: Don't use va_pa_offset on kdump 2022-01-09 10:38:06 -08:00
kgdb.c riscv: Fix "no previous prototype" compile warning in kgdb.c file 2020-07-09 20:09:30 -07:00
machine_kexec.c riscv: kexec: Fixup crash_smp_send_stop without multi cores 2022-11-29 21:50:59 -08:00
machine_kexec_file.c RISC-V: Add kexec_file support 2022-05-19 12:14:18 -07:00
mcount-dyn.S riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT 2021-01-14 15:09:05 -08:00
mcount.S RISC-V: preserve a1 in mcount 2022-12-02 10:04:37 -08:00
module-sections.c
…
module.c riscv: implement module alternatives 2022-05-11 21:36:31 -07:00
patch.c riscv: patch_text: Fixup last cpu should be master 2022-04-22 08:29:24 -07:00
perf_callchain.c riscv: Fix fill_callchain return value 2022-03-30 23:01:42 -07:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c riscv: process: fix kernel info leakage 2022-11-10 13:43:15 -08:00
ptrace.c riscv: compat: ptrace: Add compat_arch_ptrace implement 2022-05-17 16:37:22 -07:00
reset.c riscv: Use do_kernel_power_off() 2022-05-19 19:30:30 +02:00
riscv_ksyms.c riscv: provide memmove implementation 2020-12-10 17:27:54 -08:00
sbi.c RISC-V: Export sbi_get_mvendorid() and friends 2022-12-07 09:17:38 +05:30
setup.c riscv: mm: Proper page permissions after initmem free 2022-11-29 18:54:30 -08:00
signal.c RISC-V: Fix unannoted hardirqs-on in return to userspace slow-path 2022-12-08 15:31:41 -08:00
smp.c riscv: kexec: Fixup crash_smp_send_stop without multi cores 2022-11-29 21:50:59 -08:00
smpboot.c riscv: topology: fix default topology reporting 2022-08-15 22:07:34 +01:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: stacktrace: Make walk_stackframe cross pt_regs frame 2022-12-05 18:13:34 -08:00
suspend.c RISC-V: Add arch functions for non-retentive suspend entry/exit 2022-03-10 09:29:31 -08:00
suspend_entry.S RISC-V: Split out the XIP fixups into their own file 2022-05-25 14:43:33 -07:00
sys_riscv.c riscv: Allow PROT_WRITE-only mmap() 2022-09-22 09:44:59 -07:00
syscall_table.c riscv/vdso: Refactor asm/vdso.h 2021-10-02 13:42:23 -07:00
time.c RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
trace_irq.c riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
trace_irq.h riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
traps.c Merge patch series "RISC-V: Align the shadow stack" 2022-12-12 09:30:37 -08:00
traps_misaligned.c riscv: traps_misaligned: do not duplicate stringify 2022-08-11 08:56:53 -07:00
vdso.c vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy 2022-12-01 11:35:40 +01:00
vmlinux-xip.lds.S riscv: vmlinux.lds.S|vmlinux-xip.lds.S: remove `.fixup` section 2022-01-05 17:53:37 -08:00
vmlinux.lds.S riscv: vmlinux.lds.S|vmlinux-xip.lds.S: remove `.fixup` section 2022-01-05 17:53:37 -08:00