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| author | Jiantao Shan <shanjiantao@loongson.cn> | 2024-04-24 07:36:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-02 17:29:28 +0300 |
| commit | ba9bcc0e58f3e51dd0e2e018bae221d99d53c737 (patch) | |
| tree | 5da0108138f16eea7e81d2aa3c19234f64f95e5e | |
| parent | 94021d1d2b57f2b45638ad67babb29bd30518c3f (diff) | |
| download | linux-ba9bcc0e58f3e51dd0e2e018bae221d99d53c737.tar.xz | |
LoongArch: Fix access error when read fault on a write-only VMA
commit efb44ff64c95340b06331fc48634b99efc9dd77c upstream.
As with most architectures, allow handling of read faults in VMAs that
have VM_WRITE but without VM_READ (WRITE implies READ).
Otherwise, reading before writing a write-only memory will error while
reading after writing everything is fine.
BTW, move the VM_EXEC judgement before VM_READ/VM_WRITE to make logic a
little clearer.
Cc: stable@vger.kernel.org
Fixes: 09cfefb7fa70c3af01 ("LoongArch: Add memory management")
Signed-off-by: Jiantao Shan <shanjiantao@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/loongarch/mm/fault.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c index b829ab911a17..007718d51f09 100644 --- a/arch/loongarch/mm/fault.c +++ b/arch/loongarch/mm/fault.c @@ -193,10 +193,10 @@ good_area: if (!(vma->vm_flags & VM_WRITE)) goto bad_area; } else { - if (!(vma->vm_flags & VM_READ) && address != exception_era(regs)) - goto bad_area; if (!(vma->vm_flags & VM_EXEC) && address == exception_era(regs)) goto bad_area; + if (!(vma->vm_flags & (VM_READ | VM_WRITE)) && address != exception_era(regs)) + goto bad_area; } /* |