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doc: update kptr_restrict documentation

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Recently the behaviour of printk specifier %pK was changed. The
documentation does not currently mirror this.

Update documentation for sysctl kptr_restrict.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Tobin C. Harding 2017-12-20 08:17:16 +11:00 committed by Jonathan Corbet
parent b3ed23213e
commit da271403a8
1 changed files with 2 additions and 1 deletions
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Documentation/sysctl/kernel.txt
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@ -391,7 +391,8 @@ kptr_restrict:
This toggle indicates whether restrictions are placed on
exposing kernel addresses via /proc and other interfaces.
When kptr_restrict is set to (0), the default, there are no restrictions.
When kptr_restrict is set to 0 (the default) the address is hashed before
printing. (This is the equivalent to %p.)
When kptr_restrict is set to (1), kernel pointers printed using the %pK
format specifier will be replaced with 0's unless the user has CAP_SYSLOG