euidaccess/faccessat vs. ACLs

DISCUSSION Paolo Bonzini 1 participant 1 message Sep 18, 2014 Man-pages: manual pages for Linux -- Sections 2, 3, 4, 5, and 7

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Paolo Bonzini

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2014-09-18 12:25 UTC #0 lore raw

Hi,

the euidaccess and faccessat(AT_EACCESS) functions are emulated in glibc and only look at the file's uid/gid. They do not take ACLs into account, and this can cause subtle bugs. This should be noted in the BUGS section.

Also, the AT_SYMLINK_NOFOLLOW flag to faccessat currently will not work if specified alone, because Linux does not have an laccess() system call. It works if specified together with AT_EACCESS, modulo the above ACL bug of course.

Paolo
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