Signed-off-by: David Drysdale <drysdale@xxxxxxxxxx> --- man2/open.2 | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/man2/open.2 b/man2/open.2 index abc3c35b8b3a..495c7f1e81a4 100644 --- a/man2/open.2 +++ b/man2/open.2 @@ -716,6 +716,31 @@ XFS support was added .\" commit ab29743117f9f4c22ac44c13c1647fb24fb2bafe in Linux 3.15. .TP +.B O_BENEATH " (since Linux 3.??)" +Ensure that the +.I pathname +is beneath the current working directory (for +.BR open (2)) +or the +.I dirfd +(for +.BR openat (2)). +If the +.I pathname +is absolute or contains a path component of "..", the +.BR open () +fails with the error +.BR EACCES. +This occurs even if ".." path component would not actually +escape the original directory; for example, a +.I pathname +of "subdir/../filename" would be rejected. +Path components that are symbolic links to absolute paths, or that are +relative paths containing a ".." component, will also cause the +.BR open () +operation to fail with the error +.BR EACCES. +.TP .B O_TRUNC If the file already exists and is a regular file and the access mode allows writing (i.e., is @@ -792,7 +817,11 @@ The requested access to the file is not allowed, or search permission is denied for one of the directories in the path prefix of .IR pathname , or the file did not exist yet and write access to the parent directory -is not allowed. +is not allowed, or the +.B O_BENEATH +flag was specified and the +.I pathname +was not beneath the relevant directory. (See also .BR path_resolution (7).) .TP -- 2.1.0.rc2.206.gedb03e5 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
