msm: kgsl: Remove VM_MAYWRITE flag to restrict mprotect
When VM_MAYWRITE flag is used during mmap(), mprotect() can be used later to change the protection of memstore to allow write. Make sure this does not happen by removing VM_MAYWRITE from the vm_flags of vma. Change-Id: I6f69f05858ea40611d512cfa796caabeaa88cdb5 Signed-off-by: Indira Biruduraju <ibirudur@codeaurora.org>
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@ -3357,6 +3357,8 @@ kgsl_mmap_memstore(struct kgsl_device *device, struct vm_area_struct *vma)
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if (vma->vm_flags & VM_WRITE)
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if (vma->vm_flags & VM_WRITE)
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return -EPERM;
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return -EPERM;
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vma->vm_flags &= ~VM_MAYWRITE;
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if (memdesc->size != vma_size) {
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if (memdesc->size != vma_size) {
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KGSL_MEM_ERR(device, "memstore bad size: %d should be %llu\n",
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KGSL_MEM_ERR(device, "memstore bad size: %d should be %llu\n",
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vma_size, memdesc->size);
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vma_size, memdesc->size);
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