summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorHeiko Carstens <heiko.carstens@de.ibm.com>2018-04-16 12:22:24 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-29 11:32:03 +0200
commitbed2d7627a9d95ecf4662fbcd7dd30d762997b1a (patch)
treea61d294d8fdb553003955993ebbfd0350be92a33 /arch
parenta714a5f3afdd8de38985a88fc6d29f81873369d1 (diff)
s390/uprobes: implement arch_uretprobe_is_alive()
commit 783c3b53b9506db3e05daacfe34e0287eebb09d8 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/uprobes.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/s390/kernel/uprobes.c b/arch/s390/kernel/uprobes.c
index 66956c09d5bf..3d04dfdabc9f 100644
--- a/arch/s390/kernel/uprobes.c
+++ b/arch/s390/kernel/uprobes.c
@@ -147,6 +147,15 @@ 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)