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linux-stable/arch/riscv/kernel
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Liao Chang 3ca8a07f14 RISC-V: use memcpy for kexec_file mode 
[ Upstream commit b7fb4d78a6 ]

The pointer to buffer loading kernel binaries is in kernel space for
kexec_fil mode, When copy_from_user copies data from pointer to a block
of memory, it checkes that the pointer is in the user space range, on
RISCV-V that is:

static inline bool __access_ok(unsigned long addr, unsigned long size)
{
	return size <= TASK_SIZE && addr <= TASK_SIZE - size;
}

and TASK_SIZE is 0x4000000000 for 64-bits, which now causes
copy_from_user to reject the access of the field 'buf' of struct
kexec_segment that is in range [CONFIG_PAGE_OFFSET - VMALLOC_SIZE,
CONFIG_PAGE_OFFSET), is invalid user space pointer.

This patch fixes this issue by skipping access_ok(), use mempcy() instead.

Signed-off-by: Liao Chang <liaochang1@huawei.com>
Link: https://lore.kernel.org/r/20220408100914.150110-3-lizhengyu3@huawei.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-06-14 18:41:28 +02:00
..
probes ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
vdso riscv/vdso: Add support for time namespaces 2021-10-04 14:16:43 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Makefile riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
asm-offsets.c RISC-V: Avoid using per cpu array for ordered booting 2022-01-20 09:26:59 -08:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cpu-hotplug.c riscv: cpu-hotplug: clear cpu from numa map when teardown 2022-02-10 09:16:50 -08:00
cpu.c riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo 2022-01-19 17:54:10 -08:00
cpu_ops.c RISC-V: Move spinwait booting method to its own config 2022-01-20 09:27:16 -08:00
cpu_ops_sbi.c RISC-V: Declare per cpu boot data as static 2022-04-08 13:57:21 +02:00
cpu_ops_spinwait.c RISC-V: Use __cpu_up_stack/task_pointer only for spinwait method 2022-01-20 09:27:08 -08:00
cpufeature.c riscv: Add __init section marker to some functions again 2021-05-29 13:39:27 -07:00
crash_dump.c RISC-V: Add crash kernel support 2021-04-26 08:25:24 -07:00
crash_save_regs.S RISC-V: Add kdump support 2021-04-26 08:25:23 -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 2022-06-14 18:41:22 +02:00
entry.S riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
fpu.S
…
ftrace.c ftrace: Cleanup ftrace_dyn_arch_init() 2021-10-08 19:41:39 -04:00
head.S riscv: Initialize thread pointer before calling C functions 2022-06-09 10:25:13 +02:00
head.h RISC-V: Move spinwait booting method to its own config 2022-01-20 09:27:16 -08:00
image-vars.h arch/riscv:fix typo in a comment in arch/riscv/kernel/image-vars.h 2021-02-18 23:18:00 -08:00
irq.c RISC-V: Remove do_IRQ() function 2020-06-09 19:11:24 -07:00
jump_label.c riscv: Add jump-label implementation 2020-07-30 11:37:43 -07:00
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 RISC-V: use memcpy for kexec_file mode 2022-06-14 18:41:28 +02:00
mcount-dyn.S riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT 2021-01-14 15:09:05 -08:00
mcount.S riscv: Workaround mcount name prior to clang-13 2021-04-26 08:25:01 -07:00
module-sections.c
…
module.c riscv: Fix auipc+jalr relocation range checks 2022-03-10 20:37:44 -08:00
patch.c riscv: patch_text: Fixup last cpu should be master 2022-05-09 09:16:16 +02:00
perf_callchain.c uaccess: fix type mismatch warnings from access_ok() 2022-04-08 13:58:44 +02:00
perf_event.c riscv: perf_event: Make some funciton static 2020-05-11 13:48:19 -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: Turn has_fpu into a static key if FPU=y 2021-05-25 22:56:57 -07:00
ptrace.c RISC-V: Remove redundant err variable 2022-01-20 10:24:12 -08:00
reset.c riscv: set default pm_power_off to NULL 2021-10-04 14:16:57 -07:00
riscv_ksyms.c riscv: provide memmove implementation 2020-12-10 17:27:54 -08:00
sbi.c RISC-V: Fix IPI/RFENCE hmask on non-monotonic hartid ordering 2022-02-14 12:27:45 -08:00
setup.c RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY 2022-06-09 10:25:13 +02:00
signal.c riscv: Turn has_fpu into a static key if FPU=y 2021-05-25 22:56:57 -07:00
smp.c RISC-V: Use common riscv_cpuid_to_hartid_mask() for both SMP=y and SMP=n 2022-01-09 12:13:31 -08:00
smpboot.c RISC-V: Do not use cpumask data structure for hartid bitmap 2022-01-20 09:27:22 -08:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: eliminate unreliable __builtin_frame_address(1) 2022-02-04 10:12:32 -08:00
sys_riscv.c RISC-V: Don't allow write+exec only page mapping request in mmap 2020-06-18 17:28:53 -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 exit: Add and use make_task_dead. 2021-12-13 12:04:45 -06:00
traps_misaligned.c riscv: Unaligned load/store handling for M_MODE 2020-04-03 10:45:33 -07:00
vdso.c riscv/vdso: Add support for time namespaces 2021-10-04 14:16:43 -07:00
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