From 860ec7c6e21cecca8c508a66ee211b56d87f5bd7 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 23 Nov 2017 19:26:20 +0100 Subject: s390/debug: use pK for kernel pointers the s390 debug feature (/sys/kernel/debug/s390dbf/) shows the kernel pointer of the calling function even for kptr_restrict == 2. Let us use pK instead of p. This hides the kernel addresses for kptr_restrict == 2: root@host $ echo 2 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 0000000000000000 snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c root@host $ echo 1 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c root@host $ echo 0 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c Signed-off-by: Christian Borntraeger Acked-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 58b9e127b615..80e974adb9e8 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -1392,7 +1392,7 @@ int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view, else except_str = "-"; caller = (unsigned long) entry->caller; - rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %p ", + rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %pK ", area, sec, usec, level, except_str, entry->id.fields.cpuid, (void *)caller); return rc; -- cgit v1.2.3-59-g8ed1b