From: Linus Torvalds <torvalds@linux-foundation.org> stable inclusion from linux-4.19.189 commit fe8a8e4aec4ca8aa724ce0e5a781585502d5e2e4 -------------------------------- commit 0c93ac69407d63a85be0129aa55ffaec27ffebd3 upstream. This does the directory entry name verification for the legacy "fillonedir" (and compat) interface that goes all the way back to the dark ages before we had a proper dirent, and the readdir() system call returned just a single entry at a time. Nobody should use this interface unless you still have binaries from 1991, but let's do it right. This came up during discussions about unsafe_copy_to_user() and proper checking of all the inputs to it, as the networking layer is looking to use it in a few new places. So let's make sure the _old_ users do it all right and proper, before we add new ones. See also commit 8a23eb804ca4 ("Make filldir[64]() verify the directory entry filename is valid") which did the proper modern interfaces that people actually use. It had a note: Note that I didn't bother adding the checks to any legacy interfaces that nobody uses. which this now corrects. Note that we really don't care about POSIX and the presense of '/' in a directory entry, but verify_dirent_name() also ends up doing the proper name length verification which is what the input checking discussion was about. [ Another option would be to remove the support for this particular very old interface: any binaries that use it are likely a.out binaries, and they will no longer run anyway since we removed a.out binftm support in commit eac616557050 ("x86: Deprecate a.out support"). But I'm not sure which came first: getdents() or ELF support, so let's pretend somebody might still have a working binary that uses the legacy readdir() case.. ] Link: https://lore.kernel.org/lkml/CAHk-=wjbvzCAhAtvG0d81W5o0-KT5PPTHhfJ5ieDFq+bGt... Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- fs/readdir.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/readdir.c b/fs/readdir.c index d26d5ea4de7b8..fa5870a0353bf 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -146,6 +146,9 @@ static int fillonedir(struct dir_context *ctx, const char *name, int namlen, if (buf->result) return -EINVAL; + buf->result = verify_dirent_name(name, namlen); + if (buf->result < 0) + return buf->result; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->result = -EOVERFLOW; @@ -416,6 +419,9 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name, if (buf->result) return -EINVAL; + buf->result = verify_dirent_name(name, namlen); + if (buf->result < 0) + return buf->result; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->result = -EOVERFLOW; -- 2.25.1