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binder: don't use %pK through printk

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In the past %pK was preferable to %p as it would not leak raw pointer
values into the kernel log. Since commit ad67b74d24 ("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>
This commit is contained in:
Thomas Weißschuh
2026-01-07 15:29:50 +01:00
committed by Greg Kroah-Hartman
parent 68aabb29a5
commit 56d2126766
2 changed files with 4 additions and 4 deletions
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6
drivers/android/binder_alloc.c
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@@ -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);