From: Filipe Brandenburger Date: Mon, 4 Jun 2018 21:23:14 +0000 (-0700) Subject: copy: only check for traversing mount points on directories X-Git-Tag: v239~115^2~2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ef202b848bb6635dec17d3ec0041b04cd2301bed;p=thirdparty%2Fsystemd.git copy: only check for traversing mount points on directories 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 --- diff --git a/src/basic/copy.c b/src/basic/copy.c index 650de612b88..6ed46241fcc 100644 --- a/src/basic/copy.c +++ b/src/basic/copy.c @@ -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))