From: Alan Stern <stern@rowland.harvard.edu>
To: Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Kernel development list <linux-kernel@vger.kernel.org>
Subject: Printk specifiers for __user pointers
Date: Fri, 20 Nov 2020 11:44:12 -0500 [thread overview]
Message-ID: <20201120164412.GD619708@rowland.harvard.edu> (raw)
To the VSPRINTF maintainers:
Documentation/core-api/printk-formats.rst lists a large number of format
specifiers for pointers of various sorts. Yet as far as I can see,
there is no specifier meant for use with __user pointers.
The security implications of printing the true, unmangled value of a
__user pointer are minimal, since doing so does not leak any kernel
information. So %px would work, but tools like checkpatch.pl don't like
it.
Should a new specifier be added? If not, should we simply use %px?
Alan Stern
next reply other threads:[~2020-11-20 16:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 16:44 Alan Stern [this message]
2020-11-20 18:42 ` Steven Rostedt
2020-11-23 9:53 ` Petr Mladek
2020-11-23 14:11 ` Steven Rostedt
2020-11-24 21:53 ` Kees Cook
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