[PATCH RESEND] ref_tracker: use %p instead of %px in debugfs dentry name

[PATCH RESEND] ref_tracker: use %p instead of %px in debugfs dentry name

[Jeff Layton]

As Kees points out, this is a kernel address leak, and debugging is
not a sufficiently good reason to expose the real kernel address.

Fixes: 65b584f53611 ("ref_tracker: automatically register a file in debugfs for a ref_tracker_dir")
Reported-by: Kees Cook <kees@kernel.org>
Closes: https://lore.kernel.org/netdev/202507301603.62E553F93@keescook/
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Resending since I didn't get a response from Andrew. This time I've
included netdev in the mailing list in case Jakub wants to pick this up
instead.
---
 lib/ref_tracker.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c
index a9e6ffcff04b1da162a5a6add6bff075c2c9405e..cce12287708ea43e9eda9fe42f82a80423cea4e3 100644
--- a/lib/ref_tracker.c
+++ b/lib/ref_tracker.c
@@ -434,7 +434,7 @@ void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir)
 	if (dentry && !xa_is_err(dentry))
 		return;
 
-	ret = snprintf(name, sizeof(name), "%s@%px", dir->class, dir);
+	ret = snprintf(name, sizeof(name), "%s@%p", dir->class, dir);
 	name[sizeof(name) - 1] = '\0';
 
 	if (ret < sizeof(name)) {

---
base-commit: 260f6f4fda93c8485c8037865c941b42b9cba5d2
change-id: 20250731-reftrack-dbgfs-f99ad92068bc

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>

Re: [PATCH RESEND] ref_tracker: use %p instead of %px in debugfs dentry name

[Eric Dumazet]

On Fri, Aug 8, 2025 at 4:45 AM Jeff Layton <jlayton@kernel.org> wrote:
>
> As Kees points out, this is a kernel address leak, and debugging is
> not a sufficiently good reason to expose the real kernel address.
>
> Fixes: 65b584f53611 ("ref_tracker: automatically register a file in debugfs for a ref_tracker_dir")
> Reported-by: Kees Cook <kees@kernel.org>
> Closes: https://lore.kernel.org/netdev/202507301603.62E553F93@keescook/
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---

Reviewed-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH RESEND] ref_tracker: use %p instead of %px in debugfs dentry name

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 08 Aug 2025 07:45:23 -0400 you wrote:
> As Kees points out, this is a kernel address leak, and debugging is
> not a sufficiently good reason to expose the real kernel address.
> 
> Fixes: 65b584f53611 ("ref_tracker: automatically register a file in debugfs for a ref_tracker_dir")
> Reported-by: Kees Cook <kees@kernel.org>
> Closes: https://lore.kernel.org/netdev/202507301603.62E553F93@keescook/
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> 
> [...]

Here is the summary with links:
  - [RESEND] ref_tracker: use %p instead of %px in debugfs dentry name
    https://git.kernel.org/netdev/net/c/52966bf71de9

You are awesome, thank you!
-- 
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