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This pull request mostly contains some more fixes to prevent buggy guests from

Browse Source 
breaking QEMU.
 -----BEGIN PGP SIGNATURE-----
 
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 ENsAoKOVLRq8VEv3fI50dPx2JsMiqlBx
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Merge remote-tracking branch 'remotes/gkurz/tags/for-upstream' into staging

This pull request mostly contains some more fixes to prevent buggy guests from
breaking QEMU.

# gpg: Signature made Tue 01 Nov 2016 11:26:42 GMT
# gpg:                using DSA key 0x02FC3AEB0101DBC2
# gpg: Good signature from "Greg Kurz <groug@kaod.org>"
# gpg:                 aka "Greg Kurz <groug@free.fr>"
# gpg:                 aka "Greg Kurz <gkurz@fr.ibm.com>"
# gpg:                 aka "Greg Kurz <gkurz@linux.vnet.ibm.com>"
# gpg:                 aka "Gregory Kurz (Groug) <groug@free.fr>"
# gpg:                 aka "Gregory Kurz (Cimai Technology) <gkurz@cimai.com>"
# gpg:                 aka "Gregory Kurz (Meiosys Technology) <gkurz@meiosys.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2BD4 3B44 535E C0A7 9894  DBA2 02FC 3AEB 0101 DBC2

* remotes/gkurz/tags/for-upstream:
  9pfs: drop excessive error message from virtfs_reset()
  9pfs: don't BUG_ON() if fid is already opened
  9pfs: xattrcreate requires non-opened fids
  9pfs: limit xattr size in xattrcreate
  9pfs: fix integer overflow issue in xattr read/write
  9pfs: convert 'len/copied_len' field in V9fsXattr to the type of uint64_t
  9pfs: add xattrwalk_fid field in V9fsXattr struct

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2016-11-01 12:48:07 +00:00
commit 39542105bb
3 changed files with 49 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
hw/9pfs/9p.c
View File

@ -325,7 +325,7 @@ static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
{
int retval = 0;
if (fidp->fs.xattr.copied_len == -1) {
if (fidp->fs.xattr.xattrwalk_fid) {
/* getxattr/listxattr fid */
goto free_value;
}
@ -535,7 +535,7 @@ static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
{
V9fsState *s = pdu->s;
V9fsFidState *fidp = NULL;
V9fsFidState *fidp;
/* Free all fids */
while (s->fid_list) {
@ -548,11 +548,6 @@ static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
free_fid(pdu, fidp);
}
}
if (fidp) {
/* One or more unclunked fids found... */
error_report("9pfs:%s: One or more uncluncked fids "
"found during reset", __func__);
}
}
#define P9_QID_TYPE_DIR 0x80
@ -1361,7 +1356,10 @@ static void coroutine_fn v9fs_walk(void *opaque)
memcpy(&qids[name_idx], &qid, sizeof(qid));
}
if (fid == newfid) {
BUG_ON(fidp->fid_type != P9_FID_NONE);
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
v9fs_path_copy(&fidp->path, &path);
} else {
newfidp = alloc_fid(s, newfid);
@ -1443,7 +1441,10 @@ static void coroutine_fn v9fs_open(void *opaque)
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
@ -1637,20 +1638,17 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
{
ssize_t err;
size_t offset = 7;
int read_count;
int64_t xattr_len;
uint64_t read_count;
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
VirtQueueElement *elem = v->elems[pdu->idx];
xattr_len = fidp->fs.xattr.len;
read_count = xattr_len - off;
if (fidp->fs.xattr.len < off) {
read_count = 0;
} else {
read_count = fidp->fs.xattr.len - off;
}
if (read_count > max_count) {
read_count = max_count;
} else if (read_count < 0) {
/*
* read beyond XATTR value
*/
read_count = 0;
}
err = pdu_marshal(pdu, offset, "d", read_count);
if (err < 0) {
@ -1979,23 +1977,18 @@ static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
{
int i, to_copy;
ssize_t err = 0;
int write_count;
int64_t xattr_len;
uint64_t write_count;
size_t offset = 7;
xattr_len = fidp->fs.xattr.len;
write_count = xattr_len - off;
if (write_count > count) {
write_count = count;
} else if (write_count < 0) {
/*
* write beyond XATTR value len specified in
* xattrcreate
*/
if (fidp->fs.xattr.len < off) {
err = -ENOSPC;
goto out;
}
write_count = fidp->fs.xattr.len - off;
if (write_count > count) {
write_count = count;
}
err = pdu_marshal(pdu, offset, "d", write_count);
if (err < 0) {
return err;
@ -2548,7 +2541,10 @@ static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
err = -ENOENT;
goto out_nofid;
}
BUG_ON(dirfidp->fid_type != P9_FID_NONE);
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
} else {
old_name = fidp->path.data;
@ -2620,7 +2616,10 @@ static void coroutine_fn v9fs_rename(void *opaque)
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
/* if fs driver is not path based, return EOPNOTSUPP */
if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
err = -EOPNOTSUPP;
@ -3190,7 +3189,7 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque)
*/
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = -1;
xattr_fidp->fs.xattr.xattrwalk_fid = true;
if (size) {
xattr_fidp->fs.xattr.value = g_malloc(size);
err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
@ -3223,7 +3222,7 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque)
*/
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = -1;
xattr_fidp->fs.xattr.xattrwalk_fid = true;
if (size) {
xattr_fidp->fs.xattr.value = g_malloc(size);
err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
@ -3255,7 +3254,7 @@ static void coroutine_fn v9fs_xattrcreate(void *opaque)
{
int flags;
int32_t fid;
int64_t size;
uint64_t size;
ssize_t err = 0;
V9fsString name;
size_t offset = 7;
@ -3270,22 +3269,33 @@ static void coroutine_fn v9fs_xattrcreate(void *opaque)
}
trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
if (size > XATTR_SIZE_MAX) {
err = -E2BIG;
goto out_nofid;
}
file_fidp = get_fid(pdu, fid);
if (file_fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (file_fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out_put_fid;
}
/* Make the file fid point to xattr */
xattr_fidp = file_fidp;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = 0;
xattr_fidp->fs.xattr.xattrwalk_fid = false;
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fs.xattr.flags = flags;
v9fs_string_init(&xattr_fidp->fs.xattr.name);
v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
g_free(xattr_fidp->fs.xattr.value);
xattr_fidp->fs.xattr.value = g_malloc0(size);
err = offset;
out_put_fid:
put_fid(pdu, file_fidp);
out_nofid:
pdu_complete(pdu, err);

5
hw/9pfs/9p.h
View File

@ -159,11 +159,12 @@ typedef struct V9fsConf
typedef struct V9fsXattr
{
int64_t copied_len;
int64_t len;
uint64_t copied_len;
uint64_t len;
void *value;
V9fsString name;
int flags;
bool xattrwalk_fid;
} V9fsXattr;
typedef struct V9fsDir {

2
hw/9pfs/trace-events
View File

@ -42,6 +42,6 @@ v9fs_mkdir(uint16_t tag, uint8_t id, int32_t fid, char* name, int mode, uint32_t
v9fs_mkdir_return(uint16_t tag, uint8_t id, int8_t type, int32_t version, int64_t path, int err) "tag %u id %u qid={type %d version %d path %"PRId64"} err %d"
v9fs_xattrwalk(uint16_t tag, uint8_t id, int32_t fid, int32_t newfid, char* name) "tag %d id %d fid %d newfid %d name %s"
v9fs_xattrwalk_return(uint16_t tag, uint8_t id, int64_t size) "tag %d id %d size %"PRId64
v9fs_xattrcreate(uint16_t tag, uint8_t id, int32_t fid, char* name, int64_t size, int flags) "tag %d id %d fid %d name %s size %"PRId64" flags %d"
v9fs_xattrcreate(uint16_t tag, uint8_t id, int32_t fid, char* name, uint64_t size, int flags) "tag %d id %d fid %d name %s size %"PRIu64" flags %d"
v9fs_readlink(uint16_t tag, uint8_t id, int32_t fid) "tag %d id %d fid %d"
v9fs_readlink_return(uint16_t tag, uint8_t id, char* target) "tag %d id %d name %s"