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Don't permit DRM buffer mappings to be upgraded to executable.

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Reviewed by:	kib
MFC after:	1 month
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D26697
This commit is contained in:
jhb 2020-10-06 18:13:15 +00:00
parent 71506b21d8
commit e238a70cd7
1 changed files with 4 additions and 6 deletions
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10
sys/dev/drm2/drm_bufs.c
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@ -1635,14 +1635,12 @@ int drm_mapbufs(struct drm_device *dev, void *data,
goto done;
}
retcode = vm_mmap(&vms->vm_map, &virtual, map->size,
VM_PROT_READ | VM_PROT_WRITE, VM_PROT_ALL,
MAP_SHARED | MAP_NOSYNC, OBJT_DEVICE,
file_priv->minor->device, token);
VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC,
OBJT_DEVICE, file_priv->minor->device, token);
} else {
retcode = vm_mmap(&vms->vm_map, &virtual, dma->byte_count,
VM_PROT_READ | VM_PROT_WRITE, VM_PROT_ALL,
MAP_SHARED | MAP_NOSYNC, OBJT_DEVICE,
file_priv->minor->device, 0);
VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC,
OBJT_DEVICE, file_priv->minor->device, 0);
}
if (retcode) {
/* Real error */