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Merge "sysctl: enable strict writes"

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Linux Build Service Account 2017-01-30 07:04:52 -08:00 • committed by Gerrit - the friendly Code Review server
commit f6e3e8bba4
2 changed files with 8 additions and 9 deletions
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15
Documentation/sysctl/kernel.txt
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@ -850,14 +850,13 @@ via the /proc/sys interface:
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.
0 - (default) Same behavior as above, but warn about processes that
perform writes to a sysctl file descriptor when the file position
is not 0.
1 - Respect file position when writing sysctl strings. Multiple writes
will append to the sysctl value buffer. Anything past the max length
of the sysctl value buffer will be ignored. Writes to numeric sysctl
entries must always be at file position 0 and the value must be
fully contained in the buffer sent in the write syscall.
0 - Same behavior as above, but warn about processes that perform writes
to a sysctl file descriptor when the file position is not 0.
1 - (default) Respect file position when writing sysctl strings. Multiple
writes will append to the sysctl value buffer. Anything past the max
length of the sysctl value buffer will be ignored. Writes to numeric
sysctl entries must always be at file position 0 and the value must
be fully contained in the buffer sent in the write syscall.
==============================================================

2
kernel/sysctl.c
View file

@ -178,7 +178,7 @@ extern int no_unaligned_warning;
#define SYSCTL_WRITES_WARN 0
#define SYSCTL_WRITES_STRICT 1
static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
static int proc_do_cad_pid(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);