riscv: Make VM_WRITE imply VM_READ
commit7ab72c5973
upstream. 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:2139619bca
("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -184,7 +184,8 @@ static inline bool access_error(unsigned long cause, struct vm_area_struct *vma)
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}
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break;
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case EXC_LOAD_PAGE_FAULT:
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if (!(vma->vm_flags & VM_READ)) {
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/* Write implies read */
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if (!(vma->vm_flags & (VM_READ | VM_WRITE))) {
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return true;
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}
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break;
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