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sysctl: kdoc'ify sysctl_writes_strict

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Document the different sysctl_writes_strict modes in code.

Link: http://lkml.kernel.org/r/20170519033554.18592-3-mcgrof@kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luis R. Rodriguez 2017-07-12 14:33:30 -07:00 committed by Linus Torvalds
parent 89c5b53b16
commit a19ac33749
1 changed files with 25 additions and 4 deletions
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29
kernel/sysctl.c
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@ -174,11 +174,32 @@ extern int no_unaligned_warning;
#ifdef CONFIG_PROC_SYSCTL #ifdef CONFIG_PROC_SYSCTL
#define SYSCTL_WRITES_LEGACY -1 /**
#define SYSCTL_WRITES_WARN 0 * enum sysctl_writes_mode - supported sysctl write modes
#define SYSCTL_WRITES_STRICT 1 *
* @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
* to be written, and multiple writes on the same sysctl file descriptor
* will rewrite the sysctl value, regardless of file position. No warning
* is issued when the initial position is not 0.
* @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
* not 0.
* @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
* file position 0 and the value must be fully contained in the buffer
* sent to the write syscall. If dealing with strings respect the file
* position, but restrict this to the max length of the buffer, anything
* passed the max lenght will be ignored. Multiple writes will append
* to the buffer.
*
* These write modes control how current file position affects the behavior of
* updating sysctl values through the proc interface on each write.
*/
enum sysctl_writes_mode {
SYSCTL_WRITES_LEGACY = -1,
SYSCTL_WRITES_WARN = 0,
SYSCTL_WRITES_STRICT = 1,
};
static int sysctl_writes_strict = SYSCTL_WRITES_STRICT; static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
static int proc_do_cad_pid(struct ctl_table *table, int write, static int proc_do_cad_pid(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos); void __user *buffer, size_t *lenp, loff_t *ppos);