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| author | Andrew Bresticker <abrestic@rivosinc.com> | 2022-09-15 15:37:01 -0400 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-09-22 09:44:50 -0700 |
| commit | 7ab72c597356be1e7f0f3d856e54ce78527f43c8 (patch) | |
| tree | c65d1600b224e02e67b6130f31b8d1559104ae87 /arch/riscv/mm/fault.c | |
| parent | 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 (diff) | |
| download | linux-7ab72c597356be1e7f0f3d856e54ce78527f43c8.tar.bz2 | |
riscv: Make VM_WRITE imply VM_READ
RISC-V does not presently have write-only mappings as that PTE bit pattern
is considered reserved in the privileged spec, so allow handling of read
faults in VMAs that have VM_WRITE without VM_READ in order to be consistent
with other architectures that have similar limitations.
Fixes: 2139619bcad7 ("riscv: mmap with PROT_WRITE but no PROT_READ is invalid")
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Bresticker <abrestic@rivosinc.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220915193702.2201018-2-abrestic@rivosinc.com/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/mm/fault.c')
| -rw-r--r-- | arch/riscv/mm/fault.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index f2fbd1400b7c..d86f7cebd4a7 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -184,7 +184,8 @@ static inline bool access_error(unsigned long cause, struct vm_area_struct *vma) } break; case EXC_LOAD_PAGE_FAULT: - if (!(vma->vm_flags & VM_READ)) { + /* Write implies read */ + if (!(vma->vm_flags & (VM_READ | VM_WRITE))) { return true; } break; |