s390: enable HAVE_ARCH_STACKLEAK

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Add support for the stackleak feature. Whenever the kernel returns to user
space the kernel stack is filled with a poison value.

Enabling this feature is quite expensive: e.g. after instrumenting the
getpid() system call function to have a 4kb stack the result is an
increased runtime of the system call by a factor of 3.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Heiko Carstens 2023-03-27 11:37:28 +02:00 • committed by Vasily Gorbik

parent 22ca1e7738

commit b94c0ebb1e

2 changed files with 11 additions and 0 deletions

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1

arch/s390/Kconfig

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10

arch/s390/kernel/entry.S

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