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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-07 10:44:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-12 16:24:38 +0100
commitfa968ee215c0ca91e4a9c3a69ac2405aae6e5d2f (patch)
tree1b1f45f608ab83a8b4bf741b6f439a473a6b82b6 /drivers/bus
parent77b67063bb6bce6d475e910d3b886a606d0d91f7 (diff)
s390/signal: set correct address space control
If user space is running in primary mode it can switch to secondary or access register mode, this is used e.g. in the clock_gettime code of the vdso. If a signal is delivered to the user space process while it has been running in access register mode the signal handler is executed in access register mode as well which will result in a crash most of the time. Set the address space control bits in the PSW to the default for the execution of the signal handler and make sure that the previous address space control is restored on signal return. Take care that user space can not switch to the kernel address space by modifying the registers in the signal frame. Cc: stable@vger.kernel.org Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/bus')
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