[tip: perf/urgent] uprobes: Don't use %pK through printk

[tip-bot2 for Thomas Weißschuh]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     ec5fd50aeff9c9156304853c6d75eda852d4a2c8
Gitweb:        https://git.kernel.org/tip/ec5fd50aeff9c9156304853c6d75eda852d4a2c8
Author:        Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
AuthorDate:    Mon, 17 Feb 2025 08:43:35 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 18 Feb 2025 09:48:02 +01:00

uprobes: Don't use %pK through printk

Restricted pointers ("%pK") are not meant to be used through printk().
It can unintentionally expose security sensitive, raw pointer values.

Use regular pointer formatting instead.

For more background, see:

  https://lore.kernel.org/lkml/20250113171731-dc10e3c1-da64-4af0-b767-7c7070468023@xxxxxxxxxxxxx/

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20250217-restricted-pointers-uprobes-v1-1-e8cbe5bb22a7@xxxxxxxxxxxxx
---
 kernel/events/uprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 2ca797c..bf2a87a 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -417,7 +417,7 @@ static void update_ref_ctr_warn(struct uprobe *uprobe,
 				struct mm_struct *mm, short d)
 {
 	pr_warn("ref_ctr %s failed for inode: 0x%lx offset: "
-		"0x%llx ref_ctr_offset: 0x%llx of mm: 0x%pK\n",
+		"0x%llx ref_ctr_offset: 0x%llx of mm: 0x%p\n",
 		d > 0 ? "increment" : "decrement", uprobe->inode->i_ino,
 		(unsigned long long) uprobe->offset,
 		(unsigned long long) uprobe->ref_ctr_offset, mm);