vfs: add faccessat2 syscall

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POSIX defines faccessat() as having a fourth "flags" argument, while the
linux syscall doesn't have it.  Glibc tries to emulate AT_EACCESS and
AT_SYMLINK_NOFOLLOW, but AT_EACCESS emulation is broken.

Add a new faccessat(2) syscall with the added flags argument and implement
both flags.

The value of AT_EACCESS is defined in glibc headers to be the same as
AT_REMOVEDIR.  Use this value for the kernel interface as well, together
with the explanatory comment.

Also add AT_EMPTY_PATH support, which is not documented by POSIX, but can
be useful and is trivial to implement.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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This commit is contained in:

Miklos Szeredi 2020-05-14 16:44:25 +02:00

parent 55923e4d7d

commit c8ffd8bcdd

23 changed files with 62 additions and 13 deletions

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4

include/uapi/asm-generic/unistd.h

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10

include/uapi/linux/fcntl.h

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