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_mmap
allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag
causing 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;
CVSS
No CVSS.
References
Configurations
No configuration.
History
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Information
Published : 2024-07-12 13:15
Updated : 2024-07-12 16:34
NVD link : CVE-2024-39497
Mitre link : CVE-2024-39497
CVE.ORG link : CVE-2024-39497
JSON object : View
Products Affected
No product.
CWE
No CWE.