In the Linux kernel, the following vulnerability has been resolved: LoongArch: Define the __io_aw() hook as mmiowb() Commit fb24ea52f78e0d595852e ("drivers: Remove explicit invocations of mmiowb()") remove all mmiowb() in drivers, but it says: "NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation." The mmio in radeon_ring_commit() is protected by a mutex rather than a spinlock, but in the mutex fastpath it behaves similar to spinlock. We can add mmiowb() calls in the radeon driver but the maintainer says he doesn't like such a workaround, and radeon is not the only example of mutex protected mmio. So we should extend the mmiowb tracking system from spinlock to mutex, and maybe other locking primitives. This is not easy and error prone, so we solve it in the architectural code, by simply defining the __io_aw() hook as mmiowb(). And we no longer need to override queued_spin_unlock() so use the generic definition. Without this, we get such an error when run 'glxgears' on weak ordering architectures such as LoongArch: radeon 0000:04:00.0: ring 0 stalled for more than 10324msec radeon 0000:04:00.0: ring 3 stalled for more than 10240msec radeon 0000:04:00.0: GPU lockup (current fence id 0x000000000001f412 last fence id 0x000000000001f414 on ring 3) radeon 0000:04:00.0: GPU lockup (current fence id 0x000000000000f940 last fence id 0x000000000000f941 on ring 0) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35)

An update of the linux package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the Linux kernel, the following vulnerability has been resolved: LoongArch: Define the __io_aw() hook     as mmiowb() Commit fb24ea52f78e0d595852e (drivers: Remove explicit invocations of mmiowb()) remove all     mmiowb() in drivers, but it says: NOTE: mmiowb() has only ever guaranteed ordering in conjunction with     spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to     spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers     incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. The     mmio in radeon_ring_commit() is protected by a mutex rather than a spinlock, but in the mutex fastpath it     behaves similar to spinlock. We can add mmiowb() calls in the radeon driver but the maintainer says he     doesn't like such a workaround, and radeon is not the only example of mutex protected mmio. So we should     extend the mmiowb tracking system from spinlock to mutex, and maybe other locking primitives. This is not     easy and error prone, so we solve it in the architectural code, by simply defining the __io_aw() hook as     mmiowb(). And we no longer need to override queued_spin_unlock() so use the generic definition. Without     this, we get such an error when run 'glxgears' on weak ordering architectures such as LoongArch: radeon     0000:04:00.0: ring 0 stalled for more than 10324msec radeon 0000:04:00.0: ring 3 stalled for more than     10240msec radeon 0000:04:00.0: GPU lockup (current fence id 0x000000000001f412 last fence id     0x000000000001f414 on ring 3) radeon 0000:04:00.0: GPU lockup (current fence id 0x000000000000f940 last     fence id 0x000000000000f941 on ring 0) radeon 0000:04:00.0: scheduling IB failed (-35).
    [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB     failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0:
    scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) radeon     0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA     (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't     update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35). [drm:radeon_gem_va_ioctl [radeon]]
    *ERROR* Couldn't update BO_VA (-35) radeon 0000:04:00.0: scheduling IB failed (-35).
    [drm:radeon_gem_va_ioctl [radeon]] *ERROR* Couldn't update BO_VA (-35) (CVE-2024-35818)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
332184	Photon OS 5.0: Linux PHSA-2024-5.0-91-0274	Nessus	PhotonOS Local Security Checks	Local	high
239342	TencentOS Server 4: kernel (TSSA-2024:0981)	Nessus	Tencent Local Security Checks	Local	high
228717	Linux Distros Unpatched Vulnerability : CVE-2024-35818	Nessus	Misc.	Local	medium
204159	Photon OS 5.0: Linux PHSA-2024-5.0-0274	Nessus	PhotonOS Local Security Checks	Local	high

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CVE-2024-35818

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