From: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com,
berrange@redhat.com, slp@redhat.com, philmd@redhat.com
Cc: m.mizuma@jp.fujitsu.com, misono.tomohiro@jp.fujitsu.com
Subject: [PATCH v2 043/109] virtiofsd: validate input buffer sizes in do_write_buf()
Date: Tue, 21 Jan 2020 12:23:27 +0000 [thread overview]
Message-ID: <20200121122433.50803-44-dgilbert@redhat.com> (raw)
In-Reply-To: <20200121122433.50803-1-dgilbert@redhat.com>
From: Stefan Hajnoczi <stefanha@redhat.com>
There is a small change in behavior: if fuse_write_in->size doesn't
match the input buffer size then the request is failed. Previously
write requests with 1 fuse_buf element would truncate to
fuse_write_in->size.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
---
tools/virtiofsd/fuse_lowlevel.c | 49 ++++++++++++++++++++-------------
1 file changed, 30 insertions(+), 19 deletions(-)
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 84a9d5f993..5ae94cf56b 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -1004,8 +1004,8 @@ static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
}
}
-static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
- struct fuse_bufvec *ibufv)
+static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid,
+ struct fuse_mbuf_iter *iter, struct fuse_bufvec *ibufv)
{
struct fuse_session *se = req->se;
struct fuse_bufvec *pbufv = ibufv;
@@ -1013,28 +1013,27 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
.buf[0] = ibufv->buf[0],
.count = 1,
};
- struct fuse_write_in *arg = (struct fuse_write_in *)inarg;
+ struct fuse_write_in *arg;
+ size_t arg_size = sizeof(*arg);
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
+
+ arg = fuse_mbuf_iter_advance(iter, arg_size);
+ if (!arg) {
+ fuse_reply_err(req, EINVAL);
+ return;
+ }
+
+ fi.lock_owner = arg->lock_owner;
+ fi.flags = arg->flags;
fi.fh = arg->fh;
fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;
if (ibufv->count == 1) {
- fi.lock_owner = arg->lock_owner;
- fi.flags = arg->flags;
- if (!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD)) {
- tmpbufv.buf[0].mem = PARAM(arg);
- }
- tmpbufv.buf[0].size -=
- sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in);
- if (tmpbufv.buf[0].size < arg->size) {
- fuse_log(FUSE_LOG_ERR,
- "fuse: do_write_buf: buffer size too small\n");
- fuse_reply_err(req, EIO);
- return;
- }
- tmpbufv.buf[0].size = arg->size;
+ assert(!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD));
+ tmpbufv.buf[0].mem = ((char *)arg) + arg_size;
+ tmpbufv.buf[0].size -= sizeof(struct fuse_in_header) + arg_size;
pbufv = &tmpbufv;
} else {
/*
@@ -1044,6 +1043,13 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
ibufv->buf[0].size = 0;
}
+ if (fuse_buf_size(pbufv) != arg->size) {
+ fuse_log(FUSE_LOG_ERR,
+ "fuse: do_write_buf: buffer size doesn't match arg->size\n");
+ fuse_reply_err(req, EIO);
+ return;
+ }
+
se->op.write_buf(req, nodeid, pbufv, arg->offset, &fi);
}
@@ -2054,12 +2060,17 @@ void fuse_session_process_buf_int(struct fuse_session *se,
struct fuse_chan *ch)
{
const struct fuse_buf *buf = bufv->buf;
+ struct fuse_mbuf_iter iter = FUSE_MBUF_ITER_INIT(buf);
struct fuse_in_header *in;
const void *inarg;
struct fuse_req *req;
int err;
- in = buf->mem;
+ /* The first buffer must be a memory buffer */
+ assert(!(buf->flags & FUSE_BUF_IS_FD));
+
+ in = fuse_mbuf_iter_advance(&iter, sizeof(*in));
+ assert(in); /* caller guarantees the input buffer is large enough */
if (se->debug) {
fuse_log(FUSE_LOG_DEBUG,
@@ -2131,7 +2142,7 @@ void fuse_session_process_buf_int(struct fuse_session *se,
inarg = (void *)&in[1];
if (in->opcode == FUSE_WRITE && se->op.write_buf) {
- do_write_buf(req, in->nodeid, inarg, bufv);
+ do_write_buf(req, in->nodeid, &iter, bufv);
} else {
fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
}
--
2.24.1
next prev parent reply other threads:[~2020-01-21 13:26 UTC|newest]
Thread overview: 141+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-21 12:22 [PATCH v2 000/109] virtiofs daemon [all] Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 001/109] virtiofsd: Pull in upstream headers Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 002/109] virtiofsd: Pull in kernel's fuse.h Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 003/109] virtiofsd: Add auxiliary .c's Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 004/109] virtiofsd: Add fuse_lowlevel.c Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 005/109] virtiofsd: Add passthrough_ll Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 006/109] virtiofsd: Trim down imported files Dr. David Alan Gilbert (git)
2020-01-22 2:48 ` Xiao Yang
2020-01-22 10:41 ` Dr. David Alan Gilbert
2020-01-21 12:22 ` [PATCH v2 007/109] virtiofsd: Format imported files to qemu style Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 008/109] virtiofsd: remove mountpoint dummy argument Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 009/109] virtiofsd: remove unused notify reply support Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 010/109] virtiofsd: Fix fuse_daemonize ignored return values Dr. David Alan Gilbert (git)
2020-01-21 15:24 ` Philippe Mathieu-Daudé
2020-01-21 12:22 ` [PATCH v2 011/109] virtiofsd: Fix common header and define for QEMU builds Dr. David Alan Gilbert (git)
2020-01-21 15:24 ` Philippe Mathieu-Daudé
2020-01-22 15:32 ` Philippe Mathieu-Daudé
2020-01-22 16:52 ` Dr. David Alan Gilbert
2020-01-21 12:22 ` [PATCH v2 012/109] virtiofsd: Trim out compatibility code Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 013/109] vitriofsd/passthrough_ll: fix fallocate() ifdefs Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 014/109] virtiofsd: Make fsync work even if only inode is passed in Dr. David Alan Gilbert (git)
2020-01-21 12:22 ` [PATCH v2 015/109] virtiofsd: Add options for virtio Dr. David Alan Gilbert (git)
2020-01-22 6:53 ` Misono Tomohiro
2020-01-21 12:23 ` [PATCH v2 016/109] virtiofsd: add -o source=PATH to help output Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 017/109] virtiofsd: Open vhost connection instead of mounting Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 018/109] virtiofsd: Start wiring up vhost-user Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 019/109] virtiofsd: Add main virtio loop Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 020/109] virtiofsd: get/set features callbacks Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 021/109] virtiofsd: Start queue threads Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 022/109] virtiofsd: Poll kick_fd for queue Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 023/109] virtiofsd: Start reading commands from queue Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 024/109] virtiofsd: Send replies to messages Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 025/109] virtiofsd: Keep track of replies Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 026/109] virtiofsd: Add Makefile wiring for virtiofsd contrib Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 027/109] virtiofsd: Fast path for virtio read Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 028/109] virtiofsd: add --fd=FDNUM fd passing option Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 029/109] virtiofsd: make -f (foreground) the default Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 030/109] virtiofsd: add vhost-user.json file Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 031/109] virtiofsd: add --print-capabilities option Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 032/109] virtiofs: Add maintainers entry Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 033/109] virtiofsd: passthrough_ll: create new files in caller's context Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 034/109] virtiofsd: passthrough_ll: add lo_map for ino/fh indirection Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 035/109] virtiofsd: passthrough_ll: add ino_map to hide lo_inode pointers Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 036/109] virtiofsd: passthrough_ll: add dirp_map to hide lo_dirp pointers Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 037/109] virtiofsd: passthrough_ll: add fd_map to hide file descriptors Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 038/109] virtiofsd: passthrough_ll: add fallback for racy ops Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 039/109] virtiofsd: validate path components Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 040/109] virtiofsd: Plumb fuse_bufvec through to do_write_buf Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 041/109] virtiofsd: Pass write iov's all the way through Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 042/109] virtiofsd: add fuse_mbuf_iter API Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` Dr. David Alan Gilbert (git) [this message]
2020-01-21 12:23 ` [PATCH v2 044/109] virtiofsd: check input buffer size in fuse_lowlevel.c ops Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 045/109] virtiofsd: prevent ".." escape in lo_do_lookup() Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 046/109] virtiofsd: prevent ".." escape in lo_do_readdir() Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 047/109] virtiofsd: use /proc/self/fd/ O_PATH file descriptor Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 048/109] virtiofsd: sandbox mount namespace Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 049/109] virtiofsd: move to an empty network namespace Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 050/109] virtiofsd: move to a new pid namespace Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 051/109] virtiofsd: add seccomp whitelist Dr. David Alan Gilbert (git)
2020-01-21 15:54 ` Philippe Mathieu-Daudé
2020-01-21 19:49 ` Dr. David Alan Gilbert
2020-01-21 20:53 ` Philippe Mathieu-Daudé
2020-01-24 9:46 ` Florian Weimer
2020-01-24 9:51 ` Dr. David Alan Gilbert
2020-01-24 9:57 ` Dr. David Alan Gilbert
2020-01-24 10:06 ` Florian Weimer
2020-01-21 12:23 ` [PATCH v2 052/109] virtiofsd: Parse flag FUSE_WRITE_KILL_PRIV Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 053/109] virtiofsd: cap-ng helpers Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 054/109] virtiofsd: Drop CAP_FSETID if client asked for it Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 055/109] virtiofsd: set maximum RLIMIT_NOFILE limit Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 056/109] virtiofsd: fix libfuse information leaks Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 057/109] docs: Add docs/tools Dr. David Alan Gilbert (git)
2020-01-22 15:19 ` Philippe Mathieu-Daudé
2020-01-21 12:23 ` [PATCH v2 058/109] virtiofsd: add security guide document Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 059/109] virtiofsd: add --syslog command-line option Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 060/109] virtiofsd: print log only when priority is high enough Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 061/109] virtiofsd: Add ID to the log with FUSE_LOG_DEBUG level Dr. David Alan Gilbert (git)
2020-01-22 15:27 ` Philippe Mathieu-Daudé
2020-01-21 12:23 ` [PATCH v2 062/109] virtiofsd: Add timestamp " Dr. David Alan Gilbert (git)
2020-01-22 15:36 ` Philippe Mathieu-Daudé
2020-01-22 15:57 ` Dr. David Alan Gilbert
2020-01-21 12:23 ` [PATCH v2 063/109] virtiofsd: Handle reinit Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 064/109] virtiofsd: Handle hard reboot Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 065/109] virtiofsd: Kill threads when queues are stopped Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 066/109] vhost-user: Print unexpected slave message types Dr. David Alan Gilbert (git)
2020-01-22 15:41 ` Philippe Mathieu-Daudé
2020-01-22 16:00 ` Dr. David Alan Gilbert
2020-01-21 12:23 ` [PATCH v2 067/109] contrib/libvhost-user: Protect slave fd with mutex Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 068/109] virtiofsd: passthrough_ll: add renameat2 support Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 069/109] virtiofsd: passthrough_ll: disable readdirplus on cache=never Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 070/109] virtiofsd: passthrough_ll: control readdirplus Dr. David Alan Gilbert (git)
2020-01-22 3:11 ` Misono Tomohiro
2020-01-22 17:42 ` Dr. David Alan Gilbert
2020-01-21 12:23 ` [PATCH v2 071/109] virtiofsd: rename unref_inode() to unref_inode_lolocked() Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 072/109] virtiofsd: fail when parent inode isn't known in lo_do_lookup() Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 073/109] virtiofsd: extract root inode init into setup_root() Dr. David Alan Gilbert (git)
2020-01-22 1:31 ` Misono Tomohiro
2020-01-21 12:23 ` [PATCH v2 074/109] virtiofsd: passthrough_ll: clean up cache related options Dr. David Alan Gilbert (git)
2020-01-21 12:23 ` [PATCH v2 075/109] virtiofsd: passthrough_ll: use hashtable Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 076/109] virtiofsd: Clean up inodes on destroy Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 077/109] virtiofsd: support nanosecond resolution for file timestamp Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 078/109] virtiofsd: fix error handling in main() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 079/109] virtiofsd: cleanup allocated resource in se Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 080/109] virtiofsd: fix memory leak on lo.source Dr. David Alan Gilbert (git)
2020-01-22 1:54 ` Misono Tomohiro
2020-01-21 12:24 ` [PATCH v2 081/109] virtiofsd: add helper for lo_data cleanup Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 082/109] virtiofsd: Prevent multiply running with same vhost_user_socket Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 083/109] virtiofsd: enable PARALLEL_DIROPS during INIT Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 084/109] virtiofsd: fix incorrect error handling in lo_do_lookup Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 085/109] Virtiofsd: fix memory leak on fuse queueinfo Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 086/109] virtiofsd: Support remote posix locks Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 087/109] virtiofsd: use fuse_lowlevel_is_virtio() in fuse_session_destroy() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 088/109] virtiofsd: prevent fv_queue_thread() vs virtio_loop() races Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 089/109] virtiofsd: make lo_release() atomic Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 090/109] virtiofsd: prevent races with lo_dirp_put() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 091/109] virtiofsd: rename inode->refcount to inode->nlookup Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 092/109] libvhost-user: Fix some memtable remap cases Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 093/109] virtiofsd: add man page Dr. David Alan Gilbert (git)
2020-01-21 15:20 ` Philippe Mathieu-Daudé
2020-01-21 12:24 ` [PATCH v2 094/109] virtiofsd: passthrough_ll: fix refcounting on remove/rename Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 095/109] virtiofsd: introduce inode refcount to prevent use-after-free Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 096/109] virtiofsd: do not always set FUSE_FLOCK_LOCKS Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 097/109] virtiofsd: convert more fprintf and perror to use fuse log infra Dr. David Alan Gilbert (git)
2020-01-22 15:44 ` Philippe Mathieu-Daudé
2020-01-21 12:24 ` [PATCH v2 098/109] virtiofsd: Reset O_DIRECT flag during file open Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 099/109] virtiofsd: Fix data corruption with O_APPEND write in writeback mode Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 101/109] virtiofsd: use fuse_buf_writev to replace fuse_buf_write for better performance Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 102/109] virtiofsd: process requests in a thread pool Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 103/109] virtiofsd: prevent FUSE_INIT/FUSE_DESTROY races Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 104/109] virtiofsd: fix lo_destroy() resource leaks Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 105/109] virtiofsd: add --thread-pool-size=NUM option Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 106/109] virtiofsd: Convert lo_destroy to take the lo->mutex lock itself Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 107/109] virtiofsd/passthrough_ll: Pass errno to fuse_reply_err() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 108/109] virtiofsd: stop all queue threads on exit in virtio_loop() Dr. David Alan Gilbert (git)
2020-01-21 12:24 ` [PATCH v2 109/109] virtiofsd: add some options to the help message Dr. David Alan Gilbert (git)
2020-01-22 6:35 ` Misono Tomohiro
2020-01-22 18:11 ` Dr. David Alan Gilbert
2020-01-21 14:56 ` [PATCH v2 000/109] virtiofs daemon [all] no-reply
2020-01-21 15:41 ` Philippe Mathieu-Daudé
2020-01-21 17:01 ` Dr. David Alan Gilbert
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