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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-22 19:24:03 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-22 19:24:03 +0100 |
| commit | eadee0ce6fd33defe449c97e671bf83fa230b5de (patch) | |
| tree | c159a1cb09accfac1f351ce4fca24ccef9777245 /Documentation/sysctl | |
| parent | Merge branch 'akpm' (patches from Andrew) (diff) | |
| parent | [regression] fix braino in fs/dlm/user.c (diff) | |
| download | linux-eadee0ce6fd33defe449c97e671bf83fa230b5de.tar.xz linux-eadee0ce6fd33defe449c97e671bf83fa230b5de.zip | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more vfs updates from Al Viro:
"Embarrassing braino fix + pipe page accounting + fixing an eyesore in
find_filesystem() (checking that s1 is equal to prefix of s2 of given
length can be done in many ways, but "compare strlen(s1) with length
and then do strncmp()" is not a good one...)"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
[regression] fix braino in fs/dlm/user.c
pipe: limit the per-user amount of pages allocated in pipes
find_filesystem(): simplify comparison
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/fs.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/sysctl/fs.txt b/Documentation/sysctl/fs.txt index 88152f214f48..302b5ed616a6 100644 --- a/Documentation/sysctl/fs.txt +++ b/Documentation/sysctl/fs.txt @@ -32,6 +32,8 @@ Currently, these files are in /proc/sys/fs: - nr_open - overflowuid - overflowgid +- pipe-user-pages-hard +- pipe-user-pages-soft - protected_hardlinks - protected_symlinks - suid_dumpable @@ -159,6 +161,27 @@ The default is 65534. ============================================================== +pipe-user-pages-hard: + +Maximum total number of pages a non-privileged user may allocate for pipes. +Once this limit is reached, no new pipes may be allocated until usage goes +below the limit again. When set to 0, no limit is applied, which is the default +setting. + +============================================================== + +pipe-user-pages-soft: + +Maximum total number of pages a non-privileged user may allocate for pipes +before the pipe size gets limited to a single page. Once this limit is reached, +new pipes will be limited to a single page in size for this user in order to +limit total memory usage, and trying to increase them using fcntl() will be +denied until usage goes below the limit again. The default value allows to +allocate up to 1024 pipes at their default size. When set to 0, no limit is +applied. + +============================================================== + protected_hardlinks: A long-standing class of security issues is the hardlink-based |