virtio/fs/linux: Fix xattrs on symlinks #224
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The f*attr library of functions only works on files opened normally. Symlinks can only be opened with O_PATH, but that doesn't support xattr operations. So, to handle symlinks, we need to use the l*attr family of functions directly on the pathname. Thankfully, this does still work via /proc/self/fd/* for fds opened with O_PATH, so we can still do fd-relative operations (l*attr on such a path resolves the magic symlink and operates on the symlink that is actually opened as that fd). Signed-off-by: Asahi Lina <[email protected]>
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The f*attr library of functions only works on files opened normally. Symlinks can only be opened with O_PATH, but that doesn't support xattr operations. So, to handle symlinks, we need to use the l*attr family of functions directly on the pathname.
Thankfully, this does still work via /proc/self/fd/* for fds opened with O_PATH, so we can still do fd-relative operations (l*attr on such a path resolves the magic symlink and operates on the symlink that is actually opened as that fd).
This fixes
ls: bin: Too many levels of symbolic linkserrors in the guest when SELinux attributes are in use.