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authorGeert Uytterhoeven <geert+renesas@glider.be>2018-10-11 10:42:48 +0200
committerPetr Mladek <pmladek@suse.com>2018-10-12 11:24:41 +0200
commitec12bc2909f9759747ab5ad3709472353c43a750 (patch)
tree7c3bca08162b8d12fc2aa26557ded249c1f1ac4e /Documentation/core-api/printk-formats.rst
parent9073dac14e397f26603b14d5c0929186a0404a53 (diff)
lib/vsprintf: Hash legacy clock addresses
On platforms using the Common Clock Framework, "%pC" prints the clock's name. On legacy platforms, it prints the unhashed clock's address, potentially leaking sensitive information regarding the kernel layout in memory. Avoid this leak by printing the hashed address instead. To distinguish between clocks, a 32-bit unique identifier is as good as an actual pointer value. Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p") Link: http://lkml.kernel.org/r/20181011084249.4520-3-geert+renesas@glider.be To: "Tobin C . Harding" <me@tobin.cc> To: Andrew Morton <akpm@linux-foundation.org> To: Jonathan Corbet <corbet@lwn.net> Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'Documentation/core-api/printk-formats.rst')
-rw-r--r--Documentation/core-api/printk-formats.rst5
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 25dc591cb110..d39798c25585 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -420,9 +420,8 @@ struct clk
%pC pll1
%pCn pll1
-For printing struct clk structures. %pC and %pCn print the name
-(Common Clock Framework) or address (legacy clock framework) of the
-structure.
+For printing struct clk structures. %pC and %pCn print the name of the clock
+(Common Clock Framework) or a unique 32-bit ID (legacy clock framework).
Passed by reference.