Description
In the Linux kernel, the following vulnerability has been resolved: PCI: vmd: Make vmd_dev::cfg_lock a raw_spinlock_t type The access to the PCI config space via pci_ops::read and pci_ops::write is a low-level hardware access. The functions can be accessed with disabled interrupts even on PREEMPT_RT. The pci_lock is a raw_spinlock_t for this purpose. A spinlock_t becomes a sleeping lock on PREEMPT_RT, so it cannot be acquired with disabled interrupts. The vmd_dev::cfg_lock is accessed in the same context as the pci_lock. Make vmd_dev::cfg_lock a raw_spinlock_t type so it can be used with interrupts disabled. This was reported as: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 Call Trace: rt_spin_lock+0x4e/0x130 vmd_pci_read+0x8d/0x100 [vmd] pci_user_read_config_byte+0x6f/0xe0 pci_read_config+0xfe/0x290 sysfs_kf_bin_read+0x68/0x90 [bigeasy: reword commit message] Tested-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com> [kwilczynski: commit log] [bhelgaas: add back report info from https://lore.kernel.org/lkml/20241218115951.83062-1-ryotkkr98@gmail.com/]
Product status
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before c250262d6485ca333e9821f85b07eb383ec546b1
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before c2968c812339593ac6e2bdd5cc3adabe3f05fa53
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before 13e5148f70e81991acbe0bab5b1b50ba699116e7
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before 5c3cfcf0b4bf43530788b08a8eaf7896ec567484
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before 2358046ead696ca5c7c628d6c0e2c6792619a3e5
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before 20d0a9062c031068fa39f725a32f182b709b5525
185a383ada2e7794b0e82e040223e741b24d2bf8 (git) before 18056a48669a040bef491e63b25896561ee14d90
4.5
Any version before 4.5
5.15.181 (semver)
6.1.135 (semver)
6.6.88 (semver)
6.12.24 (semver)
6.13.12 (semver)
6.14.3 (semver)
6.15 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/05/msg00045.html
git.kernel.org/...c/c250262d6485ca333e9821f85b07eb383ec546b1
git.kernel.org/...c/c2968c812339593ac6e2bdd5cc3adabe3f05fa53
git.kernel.org/...c/13e5148f70e81991acbe0bab5b1b50ba699116e7
git.kernel.org/...c/5c3cfcf0b4bf43530788b08a8eaf7896ec567484
git.kernel.org/...c/2358046ead696ca5c7c628d6c0e2c6792619a3e5
git.kernel.org/...c/20d0a9062c031068fa39f725a32f182b709b5525
git.kernel.org/...c/18056a48669a040bef491e63b25896561ee14d90