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linux/arch/riscv
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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
..
boot riscv: dts: sophgo: fix DMA data-width configuration for CV18xx 2025-05-22 14:29:35 +02:00
configs timekeeping: Remove CONFIG_DEBUG_TIMEKEEPING 2024-12-14 20:04:16 +01:00
crypto crypto: lib/Kconfig - Hide arch options from user 2025-05-02 07:59:32 +02:00
errata RISC-V: errata: Use medany for relocatable builds 2025-04-10 14:39:32 +02:00
include riscv: Allow NOMMU kernels to access all of RAM 2025-05-29 11:02:05 +02:00
kernel riscv: misaligned: fix sleeping function called during misaligned access handling 2025-06-19 15:32:20 +02:00
kvm RISC-V: KVM: lock the correct mp_state during reset 2025-06-19 15:31:53 +02:00
lib Merge patch series "riscv: Improve KASAN coverage to fix unit tests" 2024-09-19 01:10:44 -07:00
mm riscv: Call secondary mmu notifier when flushing the tlb 2025-05-29 11:02:14 +02:00
net riscv, bpf: Make BPF_CMPXCHG fully ordered 2024-10-17 17:14:48 +02:00
purgatory riscv/purgatory: 4B align purgatory_start 2025-04-10 14:39:33 +02:00
tools riscv: Check relocations at compile time 2023-04-19 07:46:32 -07:00
Kbuild RISC-V: hook new crypto subdir into build-system 2024-01-22 17:55:17 -08:00
Kconfig crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32 2024-11-14 22:43:48 -08:00
Kconfig.debug riscv: Add tests for riscv module loading 2023-11-07 14:59:32 -08:00
Kconfig.errata riscv: thead: Rename T-Head PBMT to MAE 2024-04-25 10:22:33 -07:00
Kconfig.socs RISC-V: drop SOC_VIRT for ARCH_VIRT 2024-04-10 11:37:50 +01:00
Kconfig.vendor riscv: Extend cpufeature.c to detect vendor extensions 2024-07-22 15:36:54 -07:00
Makefile riscv: boot: add Image.xz support 2024-09-01 20:43:27 -07:00
Makefile.postlink kbuild: remove ARCH_POSTLINK from module builds 2023-10-28 21:10:08 +09:00