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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>
This commit is contained in:
Indira Biruduraju 2020-08-11 15:24:16 +05:30 committed by L R
parent 23bb563ae6
commit 75b4770b3a
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/msm/kgsl.c
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@ -3357,6 +3357,8 @@ kgsl_mmap_memstore(struct kgsl_device *device, struct vm_area_struct *vma)
if (vma->vm_flags & VM_WRITE)
return -EPERM;
vma->vm_flags &= ~VM_MAYWRITE;
if (memdesc->size != vma_size) {
KGSL_MEM_ERR(device, "memstore bad size: %d should be %llu\n",
vma_size, memdesc->size);