From: Vivek Goyal <vgoyal@redhat.com> To: linux-fsdevel@vger.kernel.org, miklos@szeredi.hu Cc: vgoyal@redhat.com, virtio-fs@redhat.com Subject: [PATCH 4/5] fuse: For sending setattr in case of open(O_TRUNC) Date: Fri, 24 Jul 2020 14:38:11 -0400 [thread overview] Message-ID: <20200724183812.19573-5-vgoyal@redhat.com> (raw) In-Reply-To: <20200724183812.19573-1-vgoyal@redhat.com> open(O_TRUNC) will not kill suid/sgid on server and fuse_open_in does not have information if caller has CAP_FSETID or not. So force sending setattr() which is called after open(O_TRUNC) so that server clears setuid/setgid. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> --- fs/fuse/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 82747ca4c5c8..0572779abbbe 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1516,7 +1516,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, /* This is coming from open(..., ... | O_TRUNC); */ WARN_ON(!(attr->ia_valid & ATTR_SIZE)); WARN_ON(attr->ia_size != 0); - if (fc->atomic_o_trunc) { + if (fc->atomic_o_trunc && !fc->handle_killpriv_v2) { /* * No need to send request to userspace, since actual * truncation has already been done by OPEN. But still -- 2.25.4
WARNING: multiple messages have this Message-ID (diff)
From: Vivek Goyal <vgoyal@redhat.com> To: linux-fsdevel@vger.kernel.org, miklos@szeredi.hu Cc: virtio-fs@redhat.com, vgoyal@redhat.com Subject: [Virtio-fs] [PATCH 4/5] fuse: For sending setattr in case of open(O_TRUNC) Date: Fri, 24 Jul 2020 14:38:11 -0400 [thread overview] Message-ID: <20200724183812.19573-5-vgoyal@redhat.com> (raw) In-Reply-To: <20200724183812.19573-1-vgoyal@redhat.com> open(O_TRUNC) will not kill suid/sgid on server and fuse_open_in does not have information if caller has CAP_FSETID or not. So force sending setattr() which is called after open(O_TRUNC) so that server clears setuid/setgid. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> --- fs/fuse/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 82747ca4c5c8..0572779abbbe 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1516,7 +1516,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, /* This is coming from open(..., ... | O_TRUNC); */ WARN_ON(!(attr->ia_valid & ATTR_SIZE)); WARN_ON(attr->ia_size != 0); - if (fc->atomic_o_trunc) { + if (fc->atomic_o_trunc && !fc->handle_killpriv_v2) { /* * No need to send request to userspace, since actual * truncation has already been done by OPEN. But still -- 2.25.4
next prev parent reply other threads:[~2020-07-24 18:38 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-24 18:38 [RFC PATCH 0/5] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC Vivek Goyal 2020-07-24 18:38 ` [Virtio-fs] " Vivek Goyal 2020-07-24 18:38 ` [PATCH 1/5] fuse: Introduce the notion of FUSE_HANDLE_KILLPRIV_V2 Vivek Goyal 2020-07-24 18:38 ` [Virtio-fs] " Vivek Goyal 2020-07-24 18:38 ` [PATCH 2/5] fuse: Set FUSE_WRITE_KILL_PRIV in cached write path Vivek Goyal 2020-07-24 18:38 ` [Virtio-fs] " Vivek Goyal 2020-07-24 18:38 ` [PATCH 3/5] fuse: Add a flag FUSE_SETATTR_KILL_PRIV Vivek Goyal 2020-07-24 18:38 ` [Virtio-fs] " Vivek Goyal 2020-08-21 14:53 ` Miklos Szeredi 2020-08-21 14:53 ` [Virtio-fs] " Miklos Szeredi 2020-08-21 20:56 ` Vivek Goyal 2020-08-21 20:56 ` [Virtio-fs] " Vivek Goyal 2020-07-24 18:38 ` Vivek Goyal [this message] 2020-07-24 18:38 ` [Virtio-fs] [PATCH 4/5] fuse: For sending setattr in case of open(O_TRUNC) Vivek Goyal 2020-08-21 15:05 ` Miklos Szeredi 2020-08-21 15:05 ` [Virtio-fs] " Miklos Szeredi 2020-08-21 20:59 ` Vivek Goyal 2020-08-21 20:59 ` [Virtio-fs] " Vivek Goyal 2020-07-24 18:38 ` [PATCH 5/5] virtiofs: Support SB_NOSEC flag to improve direct write performance Vivek Goyal 2020-07-24 18:38 ` [Virtio-fs] " Vivek Goyal 2020-08-21 14:46 ` [RFC PATCH 0/5] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC Miklos Szeredi 2020-08-21 14:46 ` [Virtio-fs] " Miklos Szeredi 2020-08-21 20:02 ` Vivek Goyal 2020-08-21 20:02 ` [Virtio-fs] " Vivek Goyal 2020-08-24 8:43 ` Miklos Szeredi 2020-08-24 8:43 ` [Virtio-fs] " Miklos Szeredi
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