From 05b18065ab9c375f6185b65a3631d4c6cc1a4be9 Mon Sep 17 00:00:00 2001 From: Chen Yu Date: Tue, 4 Sep 2018 15:26:22 +0800 Subject: remove_file: don't call rmdir if remove_file return failure When deleting a directory, the directory should not be removed if the file in the subdirectory fails to be deleted. Background information: When I tested the kernel using LTP (linux-test-project).I found the mv command have some issue. The LTP test case use the mv command to move the directory t1 in the cgroup file system to the /tmp directory. becase files in the cgroup file system are not allowed to be removed. so the mv reported "Permission denied", but I used the ls command to view the results and found that the directory t1 had been removed from the cgroup file system. For the same test case, I used the mv tool in the GNU coreutils, and the directory t1 will not be removed. the following testcase use busybox mv: / # mount -t cgroup -o cpu cgroup /cpu / # cd /cpu /cpu # mkdir -p t1 /cpu # ls cgroup.clone_children cpu.cfs_period_us cpu.stat t1 cgroup.procs cpu.cfs_quota_us notify_on_release tasks cgroup.sane_behavior cpu.shares release_agent /cpu # mv t1 /tmp mv: can't remove 't1/cgroup.procs': Operation not permitted mv: can't remove 't1/cpu.cfs_period_us': Operation not permitted mv: can't remove 't1/cpu.stat': Operation not permitted mv: can't remove 't1/cpu.shares': Operation not permitted mv: can't remove 't1/cpu.cfs_quota_us': Operation not permitted mv: can't remove 't1/tasks': Operation not permitted mv: can't remove 't1/notify_on_release': Operation not permitted mv: can't remove 't1/cgroup.clone_children': Operation not permitted /cpu # ls cgroup.clone_children cpu.cfs_period_us cpu.stat cgroup.procs cpu.cfs_quota_us notify_on_release tasks cgroup.sane_behavior cpu.shares release_agent /cpu # This patch fixed it, don't call rmdir if remove_file return failure, and under certain file systems, the mv could work normally. Signed-off-by: Chen Yu Signed-off-by: Denys Vlasenko --- libbb/remove_file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'libbb') diff --git a/libbb/remove_file.c b/libbb/remove_file.c index 86c9a5c..cea5d47 100644 --- a/libbb/remove_file.c +++ b/libbb/remove_file.c @@ -73,7 +73,7 @@ int FAST_FUNC remove_file(const char *path, int flags) return status; } - if (rmdir(path) < 0) { + if (status == 0 && rmdir(path) < 0) { bb_perror_msg("can't remove '%s'", path); return -1; } -- cgit v1.1