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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2014-02-03 17:37:15 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-02-05 11:00:50 +0100
commit8d7f6690cedb83456edd41c9bd583783f0703bf0 (patch)
treeb7b45c28d9f5d84b7e2aa1e813c32e6f18bd481e /drivers/s390/cio
parentd7736ff5be31edaa4fe5ab62810c64529a24b149 (diff)
s390: fix kernel crash due to linkage stack instructions
The kernel currently crashes with a low-address-protection exception if a user space process executes an instruction that tries to use the linkage stack. Set the base-ASTE origin and the subspace-ASTE origin of the dispatchable-unit-control-table to point to a dummy ASTE. Set up control register 15 to point to an empty linkage stack with no room left. A user space process with a linkage stack instruction will still crash but with a different exception which is correctly translated to a segmentation fault instead of a kernel oops. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
0 files changed, 0 insertions, 0 deletions