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1.2 KiB
1.2 KiB
CVE-2024-39497
Description
In the Linux kernel, the following vulnerability has been resolved:drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmapallows users to call mmap with PROT_WRITE and MAP_PRIVATE flagcausing a kernel panic due to BUG_ON in vmf_insert_pfn_prot:BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));Return -EINVAL early if COW mapping is detected.This bug affects all drm drivers using default shmem helpers.It can be reproduced by this simple example:void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset);ptr[0] = 0;
POC
Reference
No PoCs from references.