linux-kernel - [PATCH] powerpc: Don't use %pK through printk

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Message-Id: <20250217-restricted-pointers-powerpc-v1-1-32c6bff63c9a@linutronix.de>
Date: Mon, 17 Feb 2025 08:39:41 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>, 
 Oliver O'Halloran <oohall@...il.com>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH] powerpc: 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.

Link: https://lore.kernel.org/lkml/20250113171731-dc10e3c1-da64-4af0-b767-7c7070468023@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/powerpc/kernel/eeh_driver.c | 2 +-
 arch/powerpc/perf/hv-24x7.c      | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 7efe04c68f0fe3fb1c3c13d97d58e79e47cf103b..10ce6b3bd3b7c54f91544ae7f7fd3f32a51ee09a 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -907,7 +907,7 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		/* FIXME: Use the same format as dump_stack() */
 		pr_err("EEH: Call Trace:\n");
 		for (i = 0; i < pe->trace_entries; i++)
-			pr_err("EEH: [%pK] %pS\n", ptrs[i], ptrs[i]);
+			pr_err("EEH: [%p] %pS\n", ptrs[i], ptrs[i]);
 
 		pe->trace_entries = 0;
 	}
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index d400fa391c2765cf201ee4dc754007e655cc74ca..f6d734431b1dcdfec3b9205c3b48577b4fc26b53 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -713,12 +713,12 @@ static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
 	ev_len = be16_to_cpu(event->length);
 
 	if (ev_len % 16)
-		pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
+		pr_info("event %zu has length %zu not divisible by 16: event=%p\n",
 				event_idx, ev_len, event);
 
 	ev_end = (__u8 *)event + ev_len;
 	if (ev_end > end) {
-		pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
+		pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%p > end=%p, offset=%zu\n",
 				event_idx, ev_len, ev_end, end,
 				offset);
 		return -1;
@@ -726,14 +726,14 @@ static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
 
 	calc_ev_end = event_end(event, end);
 	if (!calc_ev_end) {
-		pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
+		pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%p end=%p, offset=%zu\n",
 			event_idx, event_data_bytes, event, end,
 			offset);
 		return -1;
 	}
 
 	if (calc_ev_end > ev_end) {
-		pr_warn("event %zu exceeds its own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
+		pr_warn("event %zu exceeds its own length: event=%p, end=%p, offset=%zu, calc_ev_end=%p\n",
 			event_idx, event, ev_end, offset, calc_ev_end);
 		return -1;
 	}

---
base-commit: 0ad2507d5d93f39619fc42372c347d6006b64319
change-id: 20250217-restricted-pointers-powerpc-f11876496464

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>