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Liao Chang 4211742f0f RISC-V: use memcpy for kexec_file mode 
[ Upstream commit b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 ]

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 18:36:15 +02:00
..
probes
riscv: kprobes: implement the branch instructions
2021-07-21 23:22:34 -07:00
vdso
riscv/vdso: Move vdso data page up front
2021-10-02 13:42:25 -07:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
asm-offsets.c
riscv: Introduce structure that group all variables regarding kernel mapping
2021-07-05 18:04:00 -07:00
cacheinfo.c
drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION()
2021-09-01 10:29:10 +02:00
cpu_ops_sbi.c
RISC-V: Support cpu hotplug
2020-03-31 11:28:30 -07:00
cpu_ops_spinwait.c
RISC-V: Add cpu_ops and modify default booting method
2020-03-31 11:25:56 -07:00
cpu_ops.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cpu-hotplug.c
riscv: cpu-hotplug: clear cpu from numa map when teardown
2022-02-16 12:56:18 +01:00
cpu.c
RISC-V: Rename and move plic_find_hart_id() to arch directory
2020-06-09 19:11:20 -07:00
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 18:36:11 +02:00
entry.S
riscv: fix oops caused by irqsoff latency tracer
2022-03-02 11:48:08 +01:00
fpu.S
riscv: abstract out CSR names for supervisor vs machine mode
2019-11-05 09:20:42 -08:00
ftrace.c
riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT
2021-01-14 15:09:05 -08:00
head.h
RISC-V: enable XIP
2021-04-26 08:31:28 -07:00
head.S
riscv: Initialize thread pointer before calling C functions
2022-06-09 10:22:26 +02:00
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
2022-01-27 11:02:50 +01:00
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 18:36:15 +02:00
Makefile
riscv: fix oops caused by irqsoff latency tracer
2022-03-02 11:48:08 +01:00
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
riscv: add missing header file includes
2019-10-28 00:46:01 -07:00
module.c
riscv: Fix auipc+jalr relocation range checks
2022-03-16 14:23:43 +01:00
patch.c
riscv: patch_text: Fixup last cpu should be master
2022-05-09 09:14:31 +02:00
perf_callchain.c
uaccess: fix type mismatch warnings from access_ok()
2022-04-08 14:24:01 +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
riscv: Ensure the value of FP registers in the core dump file is up to date
2021-08-24 20:54:10 -07:00
reset.c
riscv: cleanup the default power off implementation
2019-11-13 13:22:52 -08:00
riscv_ksyms.c
riscv: provide memmove implementation
2020-12-10 17:27:54 -08:00
sbi.c
RISC-V Patches for the 5.13 Merge Window, Part 1
2021-05-06 09:24:18 -07:00
setup.c
RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY
2022-06-09 10:22:26 +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
2022-01-27 11:02:50 +01:00
smpboot.c
sched/core: Initialize the idle task with preemption disabled
2021-05-12 13:01:45 +02:00
soc.c
riscv: Fix builtin DTB handling
2021-01-07 19:00:50 -08:00
stacktrace.c
riscv: eliminate unreliable __builtin_frame_address(1)
2022-02-16 12:56:18 +01:00
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
2022-03-02 11:48:08 +01:00
trace_irq.h
riscv: fix oops caused by irqsoff latency tracer
2022-03-02 11:48:08 +01:00
traps_misaligned.c
riscv: Unaligned load/store handling for M_MODE
2020-04-03 10:45:33 -07:00
traps.c
trap: cleanup trap_init()
2021-09-08 11:50:27 -07:00
vdso.c
riscv/vdso: make arch_setup_additional_pages wait for mmap_sem for write killable
2021-10-02 13:42:26 -07:00
vmlinux-xip.lds.S
riscv: Move EXCEPTION_TABLE to RO_DATA segment
2021-09-10 23:59:48 -07:00
vmlinux.lds.S
riscv: Move EXCEPTION_TABLE to RO_DATA segment
2021-09-10 23:59:48 -07:00