Re: [PATCH net] ptp: vmclock: prevent read-only mappings from becoming writable

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Thu, 13 Aug 2026 20:47:07 +0300 you wrote:
> vmclock_miscdev_mmap() rejects writable mappings of the shared vmclock
> ABI page with -EROFS, but leaves VM_MAYWRITE set.  Userspace can map the
> page read-only and then upgrade it to writable with mprotect(), after
> which the guest can corrupt the host-written timekeeping data (sequence
> counter, UTC time, TSC offset) that the vmclock ABI defines as read-only.
> 
> Clear VM_MAYWRITE on the read-only path so the mapping cannot be
> upgraded, as i915 does for its read-only objects and as fixed in drm/vc4
> (CVE-2026-68445) and drm/panthor (CVE-2024-53071).
> 
> [...]

Here is the summary with links:
  - [net] ptp: vmclock: prevent read-only mappings from becoming writable
    https://git.kernel.org/netdev/net/c/a5edadbae57e

You are awesome, thank you!
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