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| author | Miroslav Benes <mbenes@suse.cz> | 2019-11-27 19:35:19 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-11-30 10:52:48 +0100 |
| commit | be2d11b2a1e86586ace9f6839a159b170b00f2b3 (patch) | |
| tree | 5d01fcfa98aa73eb964d9729804e7d6d7d967bfe /arch/s390/kernel/dumpstack.c | |
| parent | bf018ee644897d7982e1b8dd8b15e97db6e1a4da (diff) | |
| download | linux-be2d11b2a1e86586ace9f6839a159b170b00f2b3.tar.bz2 | |
s390/unwind: add stack pointer alignment sanity checks
ABI requires SP to be aligned 8 bytes, report unwinding error otherwise.
Link: https://lkml.kernel.org/r/20191106095601.29986-5-mbenes@suse.cz
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/dumpstack.c')
| -rw-r--r-- | arch/s390/kernel/dumpstack.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c index d74e21a23703..d306fe04489a 100644 --- a/arch/s390/kernel/dumpstack.c +++ b/arch/s390/kernel/dumpstack.c @@ -94,6 +94,10 @@ int get_stack_info(unsigned long sp, struct task_struct *task, if (!sp) goto unknown; + /* Sanity check: ABI requires SP to be aligned 8 bytes. */ + if (sp & 0x7) + goto unknown; + /* Check per-task stack */ if (in_task_stack(sp, task, info)) goto recursion_check; |