| Message ID | 20200416155917.28536-3-levonshe@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | hardening : prevent write to proces's read-only pages | expand |
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 4e55370e48e8..e9b820780424 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -216,6 +216,11 @@ static inline void arch_unmap(struct mm_struct *mm, unsigned long start, static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, bool execute, bool foreign) { + if (unlikely(!vma_write_allowed(vma, write, foreign))) { + pr_err_once("Error : PID[%d] %s writes to read only memory\n", + current->pid, current->comm); + return false; + } /* pkeys never affect instruction fetches */ if (execute) return true;
Signed-off-by: Lev Olshvang <levonshe@gmail.com> --- arch/x86/include/asm/mmu_context.h | 5 +++++ 1 file changed, 5 insertions(+)