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linux/arch/riscv/kernel
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Nylon Chen e019873540 riscv: misaligned: fix sleeping function called during misaligned access handling 
[ Upstream commit 61a74ad254 ]

Use copy_from_user_nofault() and copy_to_user_nofault() instead of
copy_from/to_user functions in the misaligned access trap handlers.

The following bug report was found when executing misaligned memory
accesses:

BUG: sleeping function called from invalid context at ./include/linux/uaccess.h:162
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 115, name: two
preempt_count: 0, expected: 0
CPU: 0 UID: 0 PID: 115 Comm: two Not tainted 6.14.0-rc5 #24
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
 [<ffffffff800160ea>] dump_backtrace+0x1c/0x24
 [<ffffffff80002304>] show_stack+0x28/0x34
 [<ffffffff80010fae>] dump_stack_lvl+0x4a/0x68
 [<ffffffff80010fe0>] dump_stack+0x14/0x1c
 [<ffffffff8004e44e>] __might_resched+0xfa/0x104
 [<ffffffff8004e496>] __might_sleep+0x3e/0x62
 [<ffffffff801963c4>] __might_fault+0x1c/0x24
 [<ffffffff80425352>] _copy_from_user+0x28/0xaa
 [<ffffffff8000296c>] handle_misaligned_store+0x204/0x254
 [<ffffffff809eae82>] do_trap_store_misaligned+0x24/0xee
 [<ffffffff809f4f1a>] handle_exception+0x146/0x152

Fixes: b686ecdeac ("riscv: misaligned: Restrict user access to kernel memory")
Fixes: 441381506b ("riscv: misaligned: remove CONFIG_RISCV_M_MODE specific code")

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
Link: https://lore.kernel.org/r/20250411073850.3699180-3-nylon.chen@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-19 15:32:20 +02:00
..
compat_vdso Makefile: remove redundant tool coverage variables 2024-05-14 23:35:48 +09:00
pi riscv: Do not use fortify in early code 2024-10-25 06:18:36 -07:00
probes riscv: uprobes: Add missing fence.i after building the XOL buffer 2025-05-02 07:59:04 +02:00
tests treewide: replace or remove redundant def_bool in Kconfig files 2024-02-20 20:47:45 +09:00
vdso riscv: vdso: Prevent the compiler from inserting calls to memset() 2024-10-24 10:52:52 -07:00
vendor_extensions riscv: Make riscv_isa_vendor_ext_andes array static 2024-09-17 08:05:08 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi.c RISC-V: ACPI: fix early_ioremap to early_memremap 2024-10-25 06:18:31 -07:00
acpi_numa.c ACPI: NUMA: initialize all values of acpi_early_node_map to NUMA_NO_NODE 2024-09-20 01:31:26 -07:00
alternative.c riscv: errata: Rename defines for Andes 2024-03-12 07:13:12 -07:00
asm-offsets.c riscv: Remove unused GENERATING_ASM_OFFSETS 2024-10-25 06:18:41 -07:00
cacheinfo.c riscv: cacheinfo: Use of_property_present() for non-boolean properties 2025-03-07 18:25:44 +01:00
cfi.c bpf, riscv64/cfi: Support kCFI + BPF on riscv64 2024-03-06 15:18:16 -08:00
compat_signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
compat_syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
copy-unaligned.h RISC-V: Probe for unaligned access speed 2023-09-01 09:06:25 -07:00
copy-unaligned.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
cpu-hotplug.c riscv: Use '%u' to format the output of 'cpu' 2024-10-25 06:18:40 -07:00
cpu.c riscv: Add vendor extensions to /proc/cpuinfo 2024-07-22 15:36:55 -07:00
cpu_ops.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu_ops_sbi.c riscv: prevent pt_regs corruption for secondary idle threads 2024-05-30 09:42:51 -07:00
cpu_ops_spinwait.c riscv: prevent pt_regs corruption for secondary idle threads 2024-05-30 09:42:51 -07:00
cpufeature.c riscv: cpufeature: use bitmap_equal() instead of memcmp() 2025-03-07 18:25:45 +01:00
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 riscv: efi: Set NX compat flag in PE/COFF header 2024-10-25 06:18:38 -07:00
efi.c riscv: Use accessors to page table entries instead of direct dereference 2023-12-20 10:48:15 -08:00
elf_kexec.c riscv/kexec_file: Handle R_RISCV_64 in purgatory relocator 2025-04-10 14:39:33 +02:00
entry.S riscv: use local label names instead of global ones in assembly 2025-01-17 13:40:44 +01:00
fpu.S riscv: typo in comment for get_f64_reg 2024-05-22 16:12:53 -07:00
ftrace.c riscv: patch: Flush the icache right after patching to avoid illegal insns 2024-06-26 07:37:27 -07:00
head.h riscv: entry: Convert to generic entry 2023-03-23 08:47:00 -07:00
head.S riscv: set trap vector earlier 2024-07-12 08:55:31 -07:00
hibernate-asm.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
hibernate.c riscv: hibernate: remove WARN_ON in save_processor_state 2023-06-23 10:06:22 -07:00
image-vars.h efi: move screen_info into efi init code 2023-10-17 16:33:39 +02:00
irq.c Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter" 2023-11-09 06:44:13 -08:00
jump_label.c riscv: jump_label: Batch icache maintenance 2024-06-26 07:36:27 -07:00
kernel_mode_fpu.c riscv: add support for kernel-mode FPU 2024-05-19 14:36:19 -07:00
kernel_mode_vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
kexec_relocate.S riscv: kexec: Cleanup riscv_kexec_relocate 2023-09-20 02:53:29 -07:00
kgdb.c riscv: KGDB: Remove ".option norvc/.option rvc" for kgdb_compiled_break 2025-04-25 10:47:48 +02:00
machine_kexec.c riscv: kexec: Avoid deadlock in kexec crash path 2024-07-03 13:11:30 -07:00
machine_kexec_file.c RISC-V: Add kexec_file support 2022-05-19 12:14:18 -07:00
Makefile Fix mis-uses of 'cc-option' for warning disablement 2025-05-29 11:03:25 +02:00
Makefile.syscalls syscalls: fix syscall macros for newfstat/newfstatat 2024-08-02 15:20:47 +02:00
mcount-dyn.S ftrace: riscv: move from REGS to ARGS 2024-05-22 16:12:48 -07:00
mcount.S riscv: remove MCOUNT_NAME workaround 2024-02-22 15:38:54 -08:00
module-sections.c riscv: module: Allocate PLT entries for R_RISCV_PLT32 2025-04-25 10:47:48 +02:00
module.c riscv: module: Fix out-of-bounds relocation access 2025-04-25 10:47:47 +02:00
paravirt.c RISC-V: KVM: Rename the SBI_STA_SHMEM_DISABLE to a generic name 2024-04-22 11:13:52 +05:30
patch.c riscv: Re-introduce global icache flush in patch_text_XXX() 2024-08-06 06:49:14 -07:00
perf_callchain.c riscv: stacktrace: Add USER_STACKTRACE support 2024-09-14 23:57:16 -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: Randomize lower bits of stack address 2024-09-17 08:05:10 -07:00
ptrace.c Merge patch series "riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()" 2024-03-20 08:56:05 -07:00
reset.c riscv: Use do_kernel_power_off() 2022-05-19 19:30:30 +02:00
return_address.c riscv: add CALLER_ADDRx support 2024-02-22 12:17:47 -08:00
riscv_ksyms.c riscv: Omit optimized string routines when using KASAN 2024-09-19 01:10:00 -07:00
sbi-ipi.c RISC-V: Enable the IPI before workqueue_online_cpu() 2024-08-01 07:15:43 -07:00
sbi.c riscv: Fix RISCV_ALTERNATIVE_EARLY 2024-09-03 07:57:55 -07:00
sbi_ecall.c riscv: Fix RISCV_ALTERNATIVE_EARLY 2024-09-03 07:57:55 -07:00
setup.c riscv: Properly export reserved regions in /proc/iomem 2025-04-25 10:47:47 +02:00
signal.c riscv: signal: fix signal frame size 2025-03-07 18:25:44 +01:00
smp.c RISC-V: Implement kgdb_roundup_cpus() to enable future NMI Roundup 2024-09-17 05:52:44 -07:00
smpboot.c Merge patch series "Add ACPI NUMA support for RISC-V" 2024-07-22 10:31:51 -07:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: stacktrace: fix backtracing through exceptions 2025-01-17 13:40:44 +01:00
suspend.c riscv: Do not save the scratch CSR during suspend 2024-04-28 14:50:36 -07:00
suspend_entry.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
sys_hwprobe.c RISC-V: hwprobe: Add SCALAR to misaligned perf defines 2024-08-14 13:13:24 -07:00
sys_riscv.c syscalls: mmap(): use unsigned offset type consistently 2024-06-25 15:57:38 +02:00
syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
time.c RISC-V: paravirt: Add skeleton for pv-time support 2023-12-30 11:25:03 +05:30
traps.c riscv: misaligned: enable IRQs while handling misaligned accesses 2025-05-18 08:24:57 +02:00
traps_misaligned.c riscv: misaligned: fix sleeping function called during misaligned access handling 2025-06-19 15:32:20 +02:00
unaligned_access_speed.c RISC-V: Scalar unaligned access emulated on hotplug CPUs 2024-12-05 14:02:52 +01:00
vdso.c riscv: vdso: Use generic union vdso_data_store 2024-02-20 20:56:00 +01:00
vector.c RISC-V: Mark riscv_v_init() as __init 2025-02-08 09:58:09 +01:00
vendor_extensions.c riscv: Fix out-of-bounds when accessing Andes per hart vendor extension array 2024-08-15 13:12:16 -07:00
vmcore_info.c riscv: don't export va_kernel_pa_offset in vmcoreinfo for XIP kernel 2024-09-12 07:22:56 -07:00
vmlinux-xip.lds.S riscv: remove limit on the size of read-only section for XIP kernel 2024-09-12 07:23:02 -07:00
vmlinux.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00