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replace do_setxattr() with saner helpers.

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io_uring setxattr logics duplicates stuff from fs/xattr.c; provide
saner helpers (filename_setxattr() and file_setxattr() resp.) and
use them.

NB: putname(ERR_PTR()) is a no-op

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-09-25 23:57:57 -04:00
parent a10c4c5e01
commit 66d7ac6bdb
3 changed files with 54 additions and 62 deletions
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6
fs/internal.h
View File

@ -285,10 +285,10 @@ ssize_t do_getxattr(struct mnt_idmap *idmap,
struct dentry *d,
struct kernel_xattr_ctx *ctx);
int file_setxattr(struct file *file, struct kernel_xattr_ctx *ctx);
int filename_setxattr(int dfd, struct filename *filename,
unsigned int lookup_flags, struct kernel_xattr_ctx *ctx);
int setxattr_copy(const char __user *name, struct kernel_xattr_ctx *ctx);
int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct kernel_xattr_ctx *ctx);
int import_xattr_name(struct xattr_name *kname, const char __user *name);
int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);

69
fs/xattr.c
View File

@ -626,7 +626,7 @@ int setxattr_copy(const char __user *name, struct kernel_xattr_ctx *ctx)
return error;
}
int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
static int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct kernel_xattr_ctx *ctx)
{
if (is_posix_acl_xattr(ctx->kname->name))
@ -637,6 +637,45 @@ int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
ctx->kvalue, ctx->size, ctx->flags);
}
int file_setxattr(struct file *f, struct kernel_xattr_ctx *ctx)
{
int error = mnt_want_write_file(f);
if (!error) {
audit_file(f);
error = do_setxattr(file_mnt_idmap(f), f->f_path.dentry, ctx);
mnt_drop_write_file(f);
}
return error;
}
/* unconditionally consumes filename */
int filename_setxattr(int dfd, struct filename *filename,
unsigned int lookup_flags, struct kernel_xattr_ctx *ctx)
{
struct path path;
int error;
retry:
error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
if (error)
goto out;
error = mnt_want_write(path.mnt);
if (!error) {
error = do_setxattr(mnt_idmap(path.mnt), path.dentry, ctx);
mnt_drop_write(path.mnt);
}
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
out:
putname(filename);
return error;
}
static int path_setxattr(const char __user *pathname,
const char __user *name, const void __user *value,
size_t size, int flags, unsigned int lookup_flags)
@ -649,29 +688,14 @@ static int path_setxattr(const char __user *pathname,
.kname = &kname,
.flags = flags,
};
struct path path;
int error;
error = setxattr_copy(name, &ctx);
if (error)
return error;
retry:
error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
if (error)
goto out;
error = mnt_want_write(path.mnt);
if (!error) {
error = do_setxattr(mnt_idmap(path.mnt), path.dentry, &ctx);
mnt_drop_write(path.mnt);
}
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
out:
error = filename_setxattr(AT_FDCWD, getname(pathname), lookup_flags,
&ctx);
kvfree(ctx.kvalue);
return error;
}
@ -707,17 +731,12 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
if (fd_empty(f))
return -EBADF;
audit_file(fd_file(f));
error = setxattr_copy(name, &ctx);
if (error)
return error;
error = mnt_want_write_file(fd_file(f));
if (!error) {
error = do_setxattr(file_mnt_idmap(fd_file(f)),
fd_file(f)->f_path.dentry, &ctx);
mnt_drop_write_file(fd_file(f));
}
error = file_setxattr(fd_file(f), &ctx);
kvfree(ctx.kvalue);
return error;
}

41
io_uring/xattr.c
View File

@ -187,12 +187,10 @@ int io_setxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
ix->filename = getname(path);
if (IS_ERR(ix->filename)) {
ret = PTR_ERR(ix->filename);
ix->filename = NULL;
}
if (IS_ERR(ix->filename))
return PTR_ERR(ix->filename);
return ret;
return 0;
}
int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
@ -200,28 +198,14 @@ int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return __io_setxattr_prep(req, sqe);
}
static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
const struct path *path)
int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
int ret;
ret = mnt_want_write(path->mnt);
if (!ret) {
ret = do_setxattr(mnt_idmap(path->mnt), path->dentry, &ix->ctx);
mnt_drop_write(path->mnt);
}
return ret;
}
int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
{
int ret;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = __io_setxattr(req, issue_flags, &req->file->f_path);
ret = file_setxattr(req->file, &ix->ctx);
io_xattr_finish(req, ret);
return IOU_OK;
}
@ -229,23 +213,12 @@ int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
unsigned int lookup_flags = LOOKUP_FOLLOW;
struct path path;
int ret;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
retry:
ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
if (!ret) {
ret = __io_setxattr(req, issue_flags, &path);
path_put(&path);
if (retry_estale(ret, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
}
ret = filename_setxattr(AT_FDCWD, ix->filename, LOOKUP_FOLLOW, &ix->ctx);
ix->filename = NULL;
io_xattr_finish(req, ret);
return IOU_OK;
}