Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix IRQ injection with SIGP Stop and Store Status When __inject_sigp_stop() is called for a Stop and Store Status operation, if the vCPU is running, the interrupt is marked as pending and the status is stored by the thread performing the KVM_RUN IOCTL. If the vCPU is already stopped, the status is stored immediately. Storing the status means writing into userspace, which might fault, and __inject_sigp_stop() is called from do_inject_vcpu() which in turn is always called holding a spinlock, which is obviously an issue. Fix this by returning -EWOULDBLOCK from __inject_sigp_stop(), and adding a bool flag to indicate whether a store status is needed. The callers of do_inject_vcpu() are modified to pass the pointer to the bool flag; whenever a Store Status operation is needed, the callers can now perform it outside the spinlock. Opportunistically refactor kvm_s390_set_irq_state() to use scoped_guard() and __free(). [ Added Fixes tag while picking -- Claudio ]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
6cddd432e3da5e25eccbc13844d03c871674a62e to < 3bd77c59576b1d447fd56cc689ae9523a334b924affected6cddd432e3da5e25eccbc13844d03c871674a62e to < a379ac504fcb8c6fc2aa36203f5489b9581eb2e0affected6cddd432e3da5e25eccbc13844d03c871674a62e to < d0e3bf633f0585a0c2c2105ea7723777d764fae5affected6cddd432e3da5e25eccbc13844d03c871674a62e to < d343407b728a80b74be3c24b59f15e60289ea527affected
Linux Linux
Default version status: affected
4.0affected0 to < 4.0unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected