Messages in this thread Patch in this message | | | Date | Thu, 16 Apr 2015 19:43:34 +0800 | From | Wuqixuan <> | Subject | [PATCH] fs/sync.c : Add CAP_SYS_ADMIN checking before sync |
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The process, supposed in one container, can't flush the metadata and data of the all host's partitions without CAP_SYS_ADMIN capability, like sys_mount is doing. The checking will prevent some vicious programs impacting IO sequnces of those partitions, particularly, the ones which can't be accessed in the container.
Signed-off-by: Last Wu <wuqixuan@huawei.com> --- fs/sync.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/sync.c b/fs/sync.c index fbc98ee..9f07909 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -103,6 +103,9 @@ SYSCALL_DEFINE0(sync) { int nowait = 0, wait = 1;
+ if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + wakeup_flusher_threads(0, WB_REASON_SYNC); iterate_supers(sync_inodes_one_sb, NULL); iterate_supers(sync_fs_one_sb, &nowait); -- 1.9.1
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