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copy: only check for traversing mount points on directories

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This fixes the copy routines on overlay filesystem, which typically
returns the underlying st_dev for files, symlinks, etc.

The value of st_dev is guaranteed to be the same for directories, so
checking it on directories only fixes this code on overlay filesystem
and still keeps it from traversing mount points (which was the original
intent.)

There's a small side effect here, by which regular (non-directory) files
with bind mounts will be copied by the new logic (while they were
skipped by the previous logic.)

Tested: ./build/test-copy with an overlay on /tmp.

Fixes: #9134
This commit is contained in:
Filipe Brandenburger 2018-06-04 14:23:14 -07:00 committed by Lennart Poettering
parent b47837ac41
commit ef202b848b
1 changed files with 5 additions and 6 deletions
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11
src/basic/copy.c
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@ -530,13 +530,12 @@ static int fd_copy_directory(
continue;
}
if (buf.st_dev != original_device)
continue;
if (S_ISREG(buf.st_mode))
q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name, override_uid, override_gid, copy_flags);
else if (S_ISDIR(buf.st_mode))
if (S_ISDIR(buf.st_mode)) {
if (buf.st_dev != original_device)
continue;
q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, override_uid, override_gid, copy_flags);
} else if (S_ISREG(buf.st_mode))
q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name, override_uid, override_gid, copy_flags);
else if (S_ISLNK(buf.st_mode))
q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name, override_uid, override_gid, copy_flags);
else if (S_ISFIFO(buf.st_mode))