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s390/uprobes: implement arch_uretprobe_is_alive()

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Implement s390 specific arch_uretprobe_is_alive() to avoid SIGSEGVs
observed with uretprobes in combination with setjmp/longjmp.

See commit 2dea1d9c38 ("powerpc/uprobes: Implement
arch_uretprobe_is_alive()") for more details.

With this implemented all test cases referenced in the above commit
pass.

Reported-by: Ziqian SUN <zsun@redhat.com>
Cc: <stable@vger.kernel.org> # v4.3+
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2018-04-16 12:22:24 +02:00 committed by Martin Schwidefsky
parent af2e460ade
commit 783c3b53b9
1 changed files with 9 additions and 0 deletions
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9
arch/s390/kernel/uprobes.c
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@ -150,6 +150,15 @@ unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline,
return orig;
}
bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx,
struct pt_regs *regs)
{
if (ctx == RP_CHECK_CHAIN_CALL)
return user_stack_pointer(regs) <= ret->stack;
else
return user_stack_pointer(regs) < ret->stack;
}
/* Instruction Emulation */
static void adjust_psw_addr(psw_t *psw, unsigned long len)