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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2013-02-19 11:52:30 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2014-09-13 20:15:58 -0700 |
| commit | 4d2d9a106f330ce7c08fbb48f6779efb38a23ea3 (patch) | |
| tree | 29321ede9e8aa5711db9ab85dffe273a1ffe74ee | |
| parent | 0076479cddcf3e92effec68a09958607269a0102 (diff) | |
| download | man-pages-4d2d9a106f330ce7c08fbb48f6779efb38a23ea3.tar.gz | |
namespaces.7: Add further EINVAL cases for writes to userspace map files
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man7/namespaces.7 | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/man7/namespaces.7 b/man7/namespaces.7 index fbf41f4926..a2f1d8df2a 100644 --- a/man7/namespaces.7 +++ b/man7/namespaces.7 @@ -633,6 +633,13 @@ Lines are terminated by newline characters. .IP * There is an (arbitrary) limit on the number of lines in the file. As at Linux 3.8, the limit is five lines. +In addition, +the number of bytes written to the file cannot exceed the system page size, +and the write must be performed at the start of the file (i.e., +.BR lseek (2) +and +.BR pwrite (2) +can't be used to write to nonzero offsets in the file). .IP * The range of user IDs specified in each line cannot overlap with the ranges in any other lines. @@ -641,6 +648,8 @@ satisfied by a simplistic implementation that imposes the further requirement that the values in both field 1 and field 2 of successive lines must be in ascending numerical order. +.IP * +At least one line mist be written to the file. .PP Writes that violate the above rules fail with the error .BR EINVAL . |