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s390/unwind: add stack pointer alignment sanity checks

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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>
This commit is contained in:
Miroslav Benes 2019-11-27 19:35:19 +01:00 committed by Vasily Gorbik
parent bf018ee644
commit be2d11b2a1
2 changed files with 8 additions and 0 deletions
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4
arch/s390/kernel/dumpstack.c
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@ -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;

4
arch/s390/kernel/unwind_bc.c
View File

@ -92,6 +92,10 @@ bool unwind_next_frame(struct unwind_state *state)
}
}
/* Sanity check: ABI requires SP to be aligned 8 bytes. */
if (sp & 0x7)
goto out_err;
ip = ftrace_graph_ret_addr(state->task, &state->graph_idx, ip, (void *) sp);
/* Update unwind state */