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| author | Alexander Gordeev <agordeev@linux.ibm.com> | 2022-12-15 08:00:34 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-01-13 14:15:04 +0100 |
| commit | 639886b71ddef085a0e7bb1f225b8ae3eda5c06f (patch) | |
| tree | 9ee974d1a4ed1db5c0b139656bbcb1f9487f40f1 /arch/s390/kernel/head64.S | |
| parent | 9c3205b2b062420c26b33924b910880889acf832 (diff) | |
| download | linux-639886b71ddef085a0e7bb1f225b8ae3eda5c06f.tar.gz | |
s390/early: fix sclp_early_sccb variable lifetime
Commit ada1da31ce34 ("s390/sclp: sort out physical vs
virtual pointers usage") fixed the notion of virtual
address for sclp_early_sccb pointer. However, it did
not take into account that kasan_early_init() can also
output messages and sclp_early_sccb should be adjusted
by the time kasan_early_init() is called.
Currently it is not a problem, since virtual and physical
addresses on s390 are the same. Nevertheless, should they
ever differ, this would cause an invalid pointer access.
Fixes: ada1da31ce34 ("s390/sclp: sort out physical vs virtual pointers usage")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head64.S')
| -rw-r--r-- | arch/s390/kernel/head64.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index d7b8b6ad574dcc..3b3bf8329e6c1c 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -25,6 +25,7 @@ ENTRY(startup_continue) larl %r14,init_task stg %r14,__LC_CURRENT larl %r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD-__PT_SIZE + brasl %r14,sclp_early_adjust_va # allow sclp_early_printk #ifdef CONFIG_KASAN brasl %r14,kasan_early_init #endif |