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authorHeiko Carstens <heiko.carstens@de.ibm.com>2018-04-16 12:22:24 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-04-23 07:57:16 +0200
commit783c3b53b9506db3e05daacfe34e0287eebb09d8 (patch)
parentaf2e460ade0b0180d0f3812ca4f4f59cc9597f3e (diff)
s390/uprobes: implement arch_uretprobe_is_alive()
Implement s390 specific arch_uretprobe_is_alive() to avoid SIGSEGVs observed with uretprobes in combination with setjmp/longjmp. See commit 2dea1d9c38e4 ("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>
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/s390/kernel/uprobes.c b/arch/s390/kernel/uprobes.c
index d9d1f512f019..5007fac01bb5 100644
--- a/arch/s390/kernel/uprobes.c
+++ b/arch/s390/kernel/uprobes.c
@@ -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)