Messages in this thread | | | From | Andrew Ayer <> | Subject | [PATCH 0/2 RESEND] POSIX-compliant version of fchmodat with flag argument | Date | Thu, 12 Jan 2012 17:53:44 -0800 |
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Hi,
The below patches implement a 4 argument version of fchmodat (fchmodat4) that has a flag argument, as specified by POSIX. This is needed to implement a proper glibc wrapper.
fchmodat4 supports the same two flags as fchownat: AT_SYMLINK_NOFOLLOW and AT_EMPTY_PATH.
Besides the POSIX-compliance, this patch will make it possible to ensure, in a race-free way, that you do not follow symlinks when chmodding. Previously, you could open a file with O_NOFOLLOW and fchmod it, but this only worked if you had read or write permissions on the file. Now you can open the file with O_PATH|O_NOFOLLOW and do fchmodat with AT_EMPTY_PATH.
Could this patch be applied? Any feedback is welcome.
Cheers, Andrew
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