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Change History

In the Linux kernel, the following vulnerability has been resolved:

s390/sclp: Fix SCCB present check

Tracing code called by the SCLP interrupt handler contains early exits
if the SCCB address associated with an interrupt is NULL. This check is
performed after physical to virtual address translation.

If the kernel identity mapping does not start at address zero, the
resulting virtual address is never zero, so that the NULL checks won't
work. Subsequently this may result in incorrect accesses to the first
page of the identity mapping.

Fix this by introducing a function that handles the NULL case before
address translation.

https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a

https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081

https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5

https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7

https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b