AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/riscv/include/asm
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Anup Patel a256f2e329 RISC-V: Fix FIXMAP area corruption on RV32 systems 
Currently, various virtual memory areas of Linux RISC-V are organized
in increasing order of their virtual addresses is as follows:
1. User space area (This is lowest area and starts at 0x0)
2. FIXMAP area
3. VMALLOC area
4. Kernel area (This is highest area and starts at PAGE_OFFSET)

The maximum size of user space aread is represented by TASK_SIZE.

On RV32 systems, TASK_SIZE is defined as VMALLOC_START which causes the
user space area to overlap the FIXMAP area. This allows user space apps
to potentially corrupt the FIXMAP area and kernel OF APIs will crash
whenever they access corrupted FDT in the FIXMAP area.

On RV64 systems, TASK_SIZE is set to fixed 256GB and no other areas
happen to overlap so we don't see any FIXMAP area corruptions.

This patch fixes FIXMAP area corruption on RV32 systems by setting
TASK_SIZE to FIXADDR_START. We also move FIXADDR_TOP, FIXADDR_SIZE,
and FIXADDR_START defines to asm/pgtable.h so that we can avoid cyclic
header includes.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
2019-08-28 15:30:12 -07:00
..
asm-offsets.h RISC-V: Task implementation 2017-09-26 15:26:46 -07:00
asm-prototypes.h RISC-V: include linux/ftrace.h in asm-prototypes.h 2018-09-24 13:12:27 -07:00
asm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
atomic.h locking/atomic, riscv: Use s64 for atomic64 2019-06-03 12:32:56 +02:00
barrier.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
bitops.h RISC-V patches for v5.2-rc6 2019-06-17 10:34:03 -07:00
bug.h Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2019-07-08 21:48:15 -07:00
cache.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
cacheflush.h riscv: fix build break after macro-to-function conversion in generic cacheflush.h 2019-07-18 08:16:56 -07:00
cmpxchg.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
csr.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
current.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
delay.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
elf.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
fence.h riscv/spinlock: Strengthen implementations with fences 2018-04-02 19:59:43 -07:00
fixmap.h RISC-V: Fix FIXMAP area corruption on RV32 systems 2019-08-28 15:30:12 -07:00
ftrace.h riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support 2018-04-02 19:59:13 -07:00
futex.h riscv: remove CONFIG_RISCV_ISA_A 2019-04-25 14:51:10 -07:00
hugetlb.h riscv: Introduce huge page support for 32/64bit kernel 2019-07-03 15:23:38 -07:00
hwcap.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
image.h RISC-V: Add an Image header that boot loader can parse. 2019-07-11 11:58:20 -07:00
io.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
irq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
irqflags.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
Kbuild riscv: include generic support for MSI irqdomains 2019-07-22 13:06:07 -07:00
kprobes.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
linkage.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
mmiowb.h riscv/mmiowb: Hook up mmwiob() implementation to asm-generic code 2019-04-08 12:00:40 +01:00
mmu_context.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
mmu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
module.h RISC-V: Support MODULE_SECTIONS mechanism on RV32 2019-01-07 08:19:20 -08:00
page.h riscv: Introduce huge page support for 32/64bit kernel 2019-07-03 15:23:38 -07:00
pci.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
perf_event.h RISC-V: Fix !CONFIG_SMP compilation error 2018-08-13 08:31:32 -07:00
pgalloc.h riscv: switch to generic version of pte allocation 2019-07-12 11:05:45 -07:00
pgtable-32.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
pgtable-64.h RISC-V: Setup initial page tables in two stages 2019-07-09 09:08:04 -07:00
pgtable-bits.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
pgtable.h RISC-V: Fix FIXMAP area corruption on RV32 systems 2019-08-28 15:30:12 -07:00
processor.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
ptrace.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
sbi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
sifive_l2_cache.h RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs 2019-05-16 20:42:13 -07:00
smp.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
spinlock_types.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
spinlock.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
string.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
switch_to.h riscv: Make __fstate_clean() work correctly. 2019-08-14 13:20:46 -07:00
syscall.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
thread_info.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
timex.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
tlb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
tlbflush.h riscv: fix flush_tlb_range() end address for flush_tlb_page() 2019-08-13 14:03:52 -07:00
uaccess.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
unistd.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00
vdso.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
word-at-a-time.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286 2019-06-05 17:36:37 +02:00