binder: don't use %pK through printk

In the past %pK was preferable to %p as it would not leak raw pointer
values into the kernel log. Since commit ad67b74d2469 ("printk: hash
addresses printed with %p") the regular %p has been improved to avoid
this issue. Furthermore, restricted pointers ("%pK") were never meant
to be used through printk(). They can still unintentionally leak raw
pointers or acquire sleeping locks in atomic contexts.

Switch to the regular pointer formatting which is safer and
easier to reason about.

There are still a few users of %pK left, but these use it through
seq_file, for which its usage is safe.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Carlos Llamas <cmllamas@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260107-restricted-pointers-binder-v1-1-181018bf3812@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 535fc881c8daa7f64164fdac108a15c215449357..adde1e40cccd30403662786bcab77744553d3061 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -4510,7 +4510,7 @@ static int binder_thread_write(struct binder_proc *proc,
                                }
                        }
                        binder_debug(BINDER_DEBUG_DEAD_BINDER,
-                                    "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
+                                    "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
                                     proc->pid, thread->pid, (u64)cookie,
                                     death);
                        if (death == NULL) {

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 979c96b74cad36b1e1fbf0bba33282f9f526fff4..d5ed64543bbf44e545629752af726d43d157ac6a 100644 (file)
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -81,7 +81,7 @@ static void binder_insert_free_buffer(struct binder_alloc *alloc,
        new_buffer_size = binder_alloc_buffer_size(alloc, new_buffer);
 
        binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
-                    "%d: add free buffer, size %zd, at %pK\n",
+                    "%d: add free buffer, size %zd, at %p\n",
                      alloc->pid, new_buffer_size, new_buffer);
 
        while (*p) {
@@ -572,7 +572,7 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
        }
 
        binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
-                    "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",
+                    "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
                      alloc->pid, size, buffer, buffer_size);
 
        /*
@@ -748,7 +748,7 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
                ALIGN(buffer->extra_buffers_size, sizeof(void *));
 
        binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
-                    "%d: binder_free_buf %pK size %zd buffer_size %zd\n",
+                    "%d: binder_free_buf %p size %zd buffer_size %zd\n",
                      alloc->pid, buffer, size, buffer_size);
 
        BUG_ON(buffer->free);