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| author | Sven Schnelle <svens@linux.ibm.com> | 2021-04-29 11:14:51 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-04-30 17:20:39 +0200 |
| commit | bae1cd368c45d1127e054e90305d585dbc8b3b46 (patch) | |
| tree | 07224dd0189f8d3d63f1582a3ef7850250d884d0 /arch/s390/Kconfig | |
| parent | f5b474decad90719e2a4234f83d97aad19307584 (diff) | |
| download | lwn-bae1cd368c45d1127e054e90305d585dbc8b3b46.tar.gz lwn-bae1cd368c45d1127e054e90305d585dbc8b3b46.zip | |
s390/entry: add support for syscall stack randomization
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>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c1ff874e6c2e..1900428ce557 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -137,6 +137,7 @@ config S390 select HAVE_ARCH_JUMP_LABEL_RELATIVE select HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_VMALLOC + select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_SOFT_DIRTY select HAVE_ARCH_TRACEHOOK |