Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:PCI: vmd: Make vmd_dev::cfg_lock a raw_spinlock_t typeThe access to the PCI config space via pci_ops::read and pci_ops::write isa low-level hardware access. The functions can be accessed with disabledinterrupts even on PREEMPT_RT. The pci_lock is a raw_spinlock_t for thispurpose.A spinlock_t becomes a sleeping lock on PREEMPT_RT, so it cannot beacquired with disabled interrupts. The vmd_dev::cfg_lock is accessed inthe same context as the pci_lock.Make vmd_dev::cfg_lock a raw_spinlock_t type so it can be used withinterrupts 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
No PoCs from references.
- https://github.com/w4zu/Debian_security