s390/entry: add support for syscall stack randomization

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This adds support for adding a random offset to the stack while handling
syscalls. The patch uses get_tod_clock_fast() as this is considered good
enough and has much less performance penalty compared to using
get_random_int(). The patch also adds randomization in pgm_check_handler()
as the sigreturn/rt_sigreturn system calls might be called from there.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://lore.kernel.org/r/20210429091451.1062594-1-svens@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Sven Schnelle 2021-04-29 11:14:51 +02:00 • committed by Heiko Carstens

parent f5b474deca

commit bae1cd368c

4 changed files with 14 additions and 0 deletions

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1

arch/s390/Kconfig

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10

arch/s390/include/asm/entry-common.h

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1

arch/s390/kernel/syscall.c

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2

arch/s390/kernel/traps.c

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