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[virtio-9p] Make rpath thread safe

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Current rpath inline function is heavily used in all system calls.
This function has a static buffer making it a non-thread safe function.
This patch introduces new thread-safe routine and makes use of it.

Signed-off-by: Venkateswararao Jujjuri "<jvrao@linux.vnet.ibm.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-06-01 12:35:14 +05:30
parent 873c321393
commit faa44e3d3e
7 changed files with 98 additions and 92 deletions
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7
fsdev/file-op-9p.h
View File

@ -97,11 +97,4 @@ typedef struct FileOperations
void *opaque;
} FileOperations;
static inline const char *rpath(FsContext *ctx, const char *path)
{
/* FIXME: so wrong... */
static char buffer[4096];
snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
return buffer;
}
#endif

135
hw/9pfs/virtio-9p-local.c
View File

@ -25,7 +25,8 @@
static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{
int err;
err = lstat(rpath(fs_ctx, path), stbuf);
char buffer[PATH_MAX];
err = lstat(rpath(fs_ctx, path, buffer), stbuf);
if (err) {
return err;
}
@ -35,19 +36,19 @@ static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
gid_t tmp_gid;
mode_t tmp_mode;
dev_t tmp_dev;
if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.uid", &tmp_uid,
sizeof(uid_t)) > 0) {
stbuf->st_uid = tmp_uid;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.gid", &tmp_gid,
sizeof(gid_t)) > 0) {
stbuf->st_gid = tmp_gid;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
sizeof(mode_t)) > 0) {
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.mode",
&tmp_mode, sizeof(mode_t)) > 0) {
stbuf->st_mode = tmp_mode;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.rdev", &tmp_dev,
sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
@ -92,10 +93,12 @@ static int local_set_xattr(const char *path, FsCred *credp)
static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
FsCred *credp)
{
if (chmod(rpath(fs_ctx, path), credp->fc_mode & 07777) < 0) {
char buffer[PATH_MAX];
if (chmod(rpath(fs_ctx, path, buffer), credp->fc_mode & 07777) < 0) {
return -1;
}
if (lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid) < 0) {
if (lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid) < 0) {
/*
* If we fail to change ownership and if we are
* using security model none. Ignore the error
@ -111,9 +114,10 @@ static ssize_t local_readlink(FsContext *fs_ctx, const char *path,
char *buf, size_t bufsz)
{
ssize_t tsize = -1;
char buffer[PATH_MAX];
if (fs_ctx->fs_sm == SM_MAPPED) {
int fd;
fd = open(rpath(fs_ctx, path), O_RDONLY);
fd = open(rpath(fs_ctx, path, buffer), O_RDONLY);
if (fd == -1) {
return -1;
}
@ -124,7 +128,7 @@ static ssize_t local_readlink(FsContext *fs_ctx, const char *path,
return tsize;
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
tsize = readlink(rpath(fs_ctx, path), buf, bufsz);
tsize = readlink(rpath(fs_ctx, path, buffer), buf, bufsz);
}
return tsize;
}
@ -141,12 +145,14 @@ static int local_closedir(FsContext *ctx, DIR *dir)
static int local_open(FsContext *ctx, const char *path, int flags)
{
return open(rpath(ctx, path), flags);
char buffer[PATH_MAX];
return open(rpath(ctx, path, buffer), flags);
}
static DIR *local_opendir(FsContext *ctx, const char *path)
{
return opendir(rpath(ctx, path));
char buffer[PATH_MAX];
return opendir(rpath(ctx, path, buffer));
}
static void local_rewinddir(FsContext *ctx, DIR *dir)
@ -201,11 +207,12 @@ static ssize_t local_pwritev(FsContext *ctx, int fd, const struct iovec *iov,
static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp)
{
char buffer[PATH_MAX];
if (fs_ctx->fs_sm == SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path), credp);
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
return chmod(rpath(fs_ctx, path), credp->fc_mode);
return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
}
return -1;
}
@ -214,21 +221,24 @@ static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
{
int err = -1;
int serrno = 0;
char buffer[PATH_MAX];
/* Determine the security model */
if (fs_ctx->fs_sm == SM_MAPPED) {
err = mknod(rpath(fs_ctx, path), SM_LOCAL_MODE_BITS|S_IFREG, 0);
err = mknod(rpath(fs_ctx, path, buffer),
SM_LOCAL_MODE_BITS|S_IFREG, 0);
if (err == -1) {
return err;
}
local_set_xattr(rpath(fs_ctx, path), credp);
local_set_xattr(rpath(fs_ctx, path, buffer), credp);
if (err == -1) {
serrno = errno;
goto err_end;
}
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev);
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode,
credp->fc_rdev);
if (err == -1) {
return err;
}
@ -241,7 +251,7 @@ static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
return err;
err_end:
remove(rpath(fs_ctx, path));
remove(rpath(fs_ctx, path, buffer));
errno = serrno;
return err;
}
@ -250,22 +260,23 @@ static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
{
int err = -1;
int serrno = 0;
char buffer[PATH_MAX];
/* Determine the security model */
if (fs_ctx->fs_sm == SM_MAPPED) {
err = mkdir(rpath(fs_ctx, path), SM_LOCAL_DIR_MODE_BITS);
err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS);
if (err == -1) {
return err;
}
credp->fc_mode = credp->fc_mode|S_IFDIR;
err = local_set_xattr(rpath(fs_ctx, path), credp);
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp);
if (err == -1) {
serrno = errno;
goto err_end;
}
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
err = mkdir(rpath(fs_ctx, path), credp->fc_mode);
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode);
if (err == -1) {
return err;
}
@ -278,7 +289,7 @@ static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
return err;
err_end:
remove(rpath(fs_ctx, path));
remove(rpath(fs_ctx, path, buffer));
errno = serrno;
return err;
}
@ -319,23 +330,24 @@ static int local_open2(FsContext *fs_ctx, const char *path, int flags,
int fd = -1;
int err = -1;
int serrno = 0;
char buffer[PATH_MAX];
/* Determine the security model */
if (fs_ctx->fs_sm == SM_MAPPED) {
fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS);
fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS);
if (fd == -1) {
return fd;
}
credp->fc_mode = credp->fc_mode|S_IFREG;
/* Set cleint credentials in xattr */
err = local_set_xattr(rpath(fs_ctx, path), credp);
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp);
if (err == -1) {
serrno = errno;
goto err_end;
}
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
if (fd == -1) {
return fd;
}
@ -349,7 +361,7 @@ static int local_open2(FsContext *fs_ctx, const char *path, int flags,
err_end:
close(fd);
remove(rpath(fs_ctx, path));
remove(rpath(fs_ctx, path, buffer));
errno = serrno;
return err;
}
@ -360,12 +372,13 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
{
int err = -1;
int serrno = 0;
char buffer[PATH_MAX];
/* Determine the security model */
if (fs_ctx->fs_sm == SM_MAPPED) {
int fd;
ssize_t oldpath_size, write_size;
fd = open(rpath(fs_ctx, newpath), O_CREAT|O_EXCL|O_RDWR,
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR,
SM_LOCAL_MODE_BITS);
if (fd == -1) {
return fd;
@ -385,18 +398,19 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
close(fd);
/* Set cleint credentials in symlink's xattr */
credp->fc_mode = credp->fc_mode|S_IFLNK;
err = local_set_xattr(rpath(fs_ctx, newpath), credp);
err = local_set_xattr(rpath(fs_ctx, newpath, buffer), credp);
if (err == -1) {
serrno = errno;
goto err_end;
}
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
err = symlink(oldpath, rpath(fs_ctx, newpath));
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer));
if (err) {
return err;
}
err = lchown(rpath(fs_ctx, newpath), credp->fc_uid, credp->fc_gid);
err = lchown(rpath(fs_ctx, newpath, buffer), credp->fc_uid,
credp->fc_gid);
if (err == -1) {
/*
* If we fail to change ownership and if we are
@ -412,70 +426,45 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
return err;
err_end:
remove(rpath(fs_ctx, newpath));
remove(rpath(fs_ctx, newpath, buffer));
errno = serrno;
return err;
}
static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
{
char *tmp = qemu_strdup(rpath(ctx, oldpath));
int err, serrno = 0;
char buffer[PATH_MAX], buffer1[PATH_MAX];
if (tmp == NULL) {
return -ENOMEM;
}
err = link(tmp, rpath(ctx, newpath));
if (err == -1) {
serrno = errno;
}
qemu_free(tmp);
if (err == -1) {
errno = serrno;
}
return err;
return link(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
}
static int local_truncate(FsContext *ctx, const char *path, off_t size)
{
return truncate(rpath(ctx, path), size);
char buffer[PATH_MAX];
return truncate(rpath(ctx, path, buffer), size);
}
static int local_rename(FsContext *ctx, const char *oldpath,
const char *newpath)
{
char *tmp;
int err;
tmp = qemu_strdup(rpath(ctx, oldpath));
err = rename(tmp, rpath(ctx, newpath));
if (err == -1) {
int serrno = errno;
qemu_free(tmp);
errno = serrno;
} else {
qemu_free(tmp);
}
return err;
char buffer[PATH_MAX], buffer1[PATH_MAX];
return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
}
static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
{
char buffer[PATH_MAX];
if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
(fs_ctx->fs_sm == SM_PASSTHROUGH)) {
return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
return lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid);
} else if (fs_ctx->fs_sm == SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path), credp);
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
(fs_ctx->fs_sm == SM_NONE)) {
return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
return lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid);
}
return -1;
}
@ -483,12 +472,15 @@ static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
static int local_utimensat(FsContext *s, const char *path,
const struct timespec *buf)
{
return qemu_utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
char buffer[PATH_MAX];
return qemu_utimensat(AT_FDCWD, rpath(s, path, buffer), buf,
AT_SYMLINK_NOFOLLOW);
}
static int local_remove(FsContext *ctx, const char *path)
{
return remove(rpath(ctx, path));
char buffer[PATH_MAX];
return remove(rpath(ctx, path, buffer));
}
static int local_fsync(FsContext *ctx, int fd, int datasync)
@ -502,7 +494,8 @@ static int local_fsync(FsContext *ctx, int fd, int datasync)
static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
{
return statfs(rpath(s, path), stbuf);
char buffer[PATH_MAX];
return statfs(rpath(s, path, buffer), stbuf);
}
static ssize_t local_lgetxattr(FsContext *ctx, const char *path,

20
hw/9pfs/virtio-9p-posix-acl.c
View File

@ -26,7 +26,8 @@
static ssize_t mp_pacl_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
return lgetxattr(rpath(ctx, path), MAP_ACL_ACCESS, value, size);
char buffer[PATH_MAX];
return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value, size);
}
static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
@ -50,14 +51,17 @@ static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
return lsetxattr(rpath(ctx, path), MAP_ACL_ACCESS, value, size, flags);
char buffer[PATH_MAX];
return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value,
size, flags);
}
static int mp_pacl_removexattr(FsContext *ctx,
const char *path, const char *name)
{
int ret;
ret = lremovexattr(rpath(ctx, path), MAP_ACL_ACCESS);
char buffer[PATH_MAX];
ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS);
if (ret == -1 && errno == ENODATA) {
/*
* We don't get ENODATA error when trying to remove a
@ -73,7 +77,8 @@ static int mp_pacl_removexattr(FsContext *ctx,
static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
return lgetxattr(rpath(ctx, path), MAP_ACL_DEFAULT, value, size);
char buffer[PATH_MAX];
return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value, size);
}
static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
@ -97,14 +102,17 @@ static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
return lsetxattr(rpath(ctx, path), MAP_ACL_DEFAULT, value, size, flags);
char buffer[PATH_MAX];
return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value,
size, flags);
}
static int mp_dacl_removexattr(FsContext *ctx,
const char *path, const char *name)
{
int ret;
ret = lremovexattr(rpath(ctx, path), MAP_ACL_DEFAULT);
char buffer[PATH_MAX];
ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT);
if (ret == -1 && errno == ENODATA) {
/*
* We don't get ENODATA error when trying to remove a

9
hw/9pfs/virtio-9p-xattr-user.c
View File

@ -21,6 +21,7 @@
static ssize_t mp_user_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
char buffer[PATH_MAX];
if (strncmp(name, "user.virtfs.", 12) == 0) {
/*
* Don't allow fetch of user.virtfs namesapce
@ -29,7 +30,7 @@ static ssize_t mp_user_getxattr(FsContext *ctx, const char *path,
errno = ENOATTR;
return -1;
}
return lgetxattr(rpath(ctx, path), name, value, size);
return lgetxattr(rpath(ctx, path, buffer), name, value, size);
}
static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
@ -67,6 +68,7 @@ static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
char buffer[PATH_MAX];
if (strncmp(name, "user.virtfs.", 12) == 0) {
/*
* Don't allow fetch of user.virtfs namesapce
@ -75,12 +77,13 @@ static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name,
errno = EACCES;
return -1;
}
return lsetxattr(rpath(ctx, path), name, value, size, flags);
return lsetxattr(rpath(ctx, path, buffer), name, value, size, flags);
}
static int mp_user_removexattr(FsContext *ctx,
const char *path, const char *name)
{
char buffer[PATH_MAX];
if (strncmp(name, "user.virtfs.", 12) == 0) {
/*
* Don't allow fetch of user.virtfs namesapce
@ -89,7 +92,7 @@ static int mp_user_removexattr(FsContext *ctx,
errno = EACCES;
return -1;
}
return lremovexattr(rpath(ctx, path), name);
return lremovexattr(rpath(ctx, path, buffer), name);
}
XattrOperations mapped_user_xattr = {

5
hw/9pfs/virtio-9p-xattr.c
View File

@ -66,20 +66,21 @@ ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
void *value, size_t vsize)
{
ssize_t size = 0;
char buffer[PATH_MAX];
void *ovalue = value;
XattrOperations *xops;
char *orig_value, *orig_value_start;
ssize_t xattr_len, parsed_len = 0, attr_len;
/* Get the actual len */
xattr_len = llistxattr(rpath(ctx, path), value, 0);
xattr_len = llistxattr(rpath(ctx, path, buffer), value, 0);
if (xattr_len <= 0) {
return xattr_len;
}
/* Now fetch the xattr and find the actual size */
orig_value = qemu_malloc(xattr_len);
xattr_len = llistxattr(rpath(ctx, path), orig_value, xattr_len);
xattr_len = llistxattr(rpath(ctx, path, buffer), orig_value, xattr_len);
/* store the orig pointer */
orig_value_start = orig_value;

9
hw/9pfs/virtio-9p-xattr.h
View File

@ -54,20 +54,23 @@ ssize_t pt_listxattr(FsContext *ctx, const char *path, char *name, void *value,
static inline ssize_t pt_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
return lgetxattr(rpath(ctx, path), name, value, size);
char buffer[PATH_MAX];
return lgetxattr(rpath(ctx, path, buffer), name, value, size);
}
static inline int pt_setxattr(FsContext *ctx, const char *path,
const char *name, void *value,
size_t size, int flags)
{
return lsetxattr(rpath(ctx, path), name, value, size, flags);
char buffer[PATH_MAX];
return lsetxattr(rpath(ctx, path, buffer), name, value, size, flags);
}
static inline int pt_removexattr(FsContext *ctx,
const char *path, const char *name)
{
return lremovexattr(rpath(ctx, path), name);
char buffer[PATH_MAX];
return lremovexattr(rpath(ctx, path, buffer), name);
}
static inline ssize_t notsup_getxattr(FsContext *ctx, const char *path,

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

@ -101,6 +101,11 @@ enum p9_proto_version {
#define P9_NOTAG (u16)(~0)
#define P9_NOFID (u32)(~0)
#define P9_MAXWELEM 16
static inline const char *rpath(FsContext *ctx, const char *path, char *buffer)
{
snprintf(buffer, PATH_MAX, "%s/%s", ctx->fs_root, path);
return buffer;
}
/*
* ample room for Twrite/Rread header