Fixes: ef0010a30935 ("vsprintf: don't use 'restricted_pointer()' when not restricting") for /sys/module/*/sections/.text file.
Reading file /proc/modules shows the correct address: [root@s35lp76 ~]# cat /proc/modules | egrep '^qeth_l2' qeth_l2 94208 1 - Live 0x000003ff80401000
and reading file /sys/module/qeth_l2/sections/.text [root@s35lp76 ~]# cat /sys/module/qeth_l2/sections/.text 0x0000000018ea8363 displays a random address.
This breaks the perf tool which uses this address on s390 to calculate start of .text section in memory.
Fix this by printing the correct (unhashed) address.
Thanks to Jessica Yu for helping on this.
Suggested-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Thomas Richter tmricht@linux.ibm.com Cc: Jessica Yu jeyu@kernel.org Cc: stable@vger.kernel.org --- kernel/module.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/module.c b/kernel/module.c index a6e43a5806a1..40b42000bd80 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1472,7 +1472,8 @@ static ssize_t module_sect_show(struct module_attribute *mattr, { struct module_sect_attr *sattr = container_of(mattr, struct module_sect_attr, mattr); - return sprintf(buf, "0x%pK\n", (void *)sattr->address); + return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? + (void *)sattr->address : 0); }
static void free_sect_attrs(struct module_sect_attrs *sect_attrs)