sanitize xattr and io_uring interactions with it,

add *xattrat() syscalls, sanitize struct filename handling in there.
 
 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull xattr updates from Al Viro:
 "Sanitize xattr and io_uring interactions with it, add *xattrat()
  syscalls, sanitize struct filename handling in there"

* tag 'pull-xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  xattr: remove redundant check on variable err
  fs/xattr: add *at family syscalls
  new helpers: file_removexattr(), filename_removexattr()
  new helpers: file_listxattr(), filename_listxattr()
  replace do_getxattr() with saner helpers.
  replace do_setxattr() with saner helpers.
  new helper: import_xattr_name()
  fs: rename struct xattr_ctx to kernel_xattr_ctx
  xattr: switch to CLASS(fd)
  io_[gs]etxattr_prep(): just use getname()
  io_uring: IORING_OP_F[GS]ETXATTR is fine with REQ_F_FIXED_FILE
  getname_maybe_null() - the third variant of pathname copy-in
  teach filename_lookup() to treat NULL filename as ""

arch/alpha/kernel/syscalls/syscall.tbl

@@ -502,3 +502,7 @@
 570	common	lsm_set_self_attr		sys_lsm_set_self_attr
 571	common	lsm_list_modules		sys_lsm_list_modules
 572	common  mseal				sys_mseal
+573	common	setxattrat			sys_setxattrat
+574	common	getxattrat			sys_getxattrat
+575	common	listxattrat			sys_listxattrat
+576	common	removexattrat			sys_removexattrat

arch/arm/tools/syscall.tbl

@@ -477,3 +477,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/arm64/tools/syscall_32.tbl

@@ -474,3 +474,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/m68k/kernel/syscalls/syscall.tbl

@@ -462,3 +462,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/microblaze/kernel/syscalls/syscall.tbl

@@ -468,3 +468,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/mips/kernel/syscalls/syscall_n32.tbl

@@ -401,3 +401,7 @@
 460	n32	lsm_set_self_attr		sys_lsm_set_self_attr
 461	n32	lsm_list_modules		sys_lsm_list_modules
 462	n32	mseal				sys_mseal
+463	n32	setxattrat			sys_setxattrat
+464	n32	getxattrat			sys_getxattrat
+465	n32	listxattrat			sys_listxattrat
+466	n32	removexattrat			sys_removexattrat

arch/mips/kernel/syscalls/syscall_n64.tbl

@@ -377,3 +377,7 @@
 460	n64	lsm_set_self_attr		sys_lsm_set_self_attr
 461	n64	lsm_list_modules		sys_lsm_list_modules
 462	n64	mseal				sys_mseal
+463	n64	setxattrat			sys_setxattrat
+464	n64	getxattrat			sys_getxattrat
+465	n64	listxattrat			sys_listxattrat
+466	n64	removexattrat			sys_removexattrat

arch/mips/kernel/syscalls/syscall_o32.tbl

@@ -450,3 +450,7 @@
 460	o32	lsm_set_self_attr		sys_lsm_set_self_attr
 461	o32	lsm_list_modules		sys_lsm_list_modules
 462	o32	mseal				sys_mseal
+463	o32	setxattrat			sys_setxattrat
+464	o32	getxattrat			sys_getxattrat
+465	o32	listxattrat			sys_listxattrat
+466	o32	removexattrat			sys_removexattrat

arch/parisc/kernel/syscalls/syscall.tbl

@@ -461,3 +461,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/powerpc/kernel/syscalls/syscall.tbl

@@ -553,3 +553,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/s390/kernel/syscalls/syscall.tbl

@@ -465,3 +465,7 @@
 460  common	lsm_set_self_attr	sys_lsm_set_self_attr		sys_lsm_set_self_attr
 461  common	lsm_list_modules	sys_lsm_list_modules		sys_lsm_list_modules
 462  common	mseal			sys_mseal			sys_mseal
+463  common	setxattrat		sys_setxattrat			sys_setxattrat
+464  common	getxattrat		sys_getxattrat			sys_getxattrat
+465  common	listxattrat		sys_listxattrat			sys_listxattrat
+466  common	removexattrat		sys_removexattrat		sys_removexattrat

arch/sh/kernel/syscalls/syscall.tbl

@@ -466,3 +466,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/sparc/kernel/syscalls/syscall.tbl

@@ -508,3 +508,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal 				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

arch/x86/entry/syscalls/syscall_32.tbl

@@ -468,3 +468,7 @@
 460	i386	lsm_set_self_attr	sys_lsm_set_self_attr
 461	i386	lsm_list_modules	sys_lsm_list_modules
 462	i386	mseal 			sys_mseal
+463	i386	setxattrat		sys_setxattrat
+464	i386	getxattrat		sys_getxattrat
+465	i386	listxattrat		sys_listxattrat
+466	i386	removexattrat		sys_removexattrat

arch/x86/entry/syscalls/syscall_64.tbl

@@ -386,6 +386,10 @@
 460	common	lsm_set_self_attr	sys_lsm_set_self_attr
 461	common	lsm_list_modules	sys_lsm_list_modules
 462 	common  mseal			sys_mseal
+463	common	setxattrat		sys_setxattrat
+464	common	getxattrat		sys_getxattrat
+465	common	listxattrat		sys_listxattrat
+466	common	removexattrat		sys_removexattrat
 
 #
 # Due to a historical design error, certain syscalls are numbered differently

arch/xtensa/kernel/syscalls/syscall.tbl

@@ -433,3 +433,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal 				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat

fs/internal.h

@@ -267,7 +267,7 @@ struct xattr_name {
 	char name[XATTR_NAME_MAX + 1];
 };
 
-struct xattr_ctx {
+struct kernel_xattr_ctx {
 	/* Value of attribute */
 	union {
 		const void __user *cvalue;
@@ -280,14 +280,15 @@ struct xattr_ctx {
 	unsigned int flags;
 };
 
+ssize_t file_getxattr(struct file *file, struct kernel_xattr_ctx *ctx);
+ssize_t filename_getxattr(int dfd, struct filename *filename,
+			  unsigned int lookup_flags, 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 import_xattr_name(struct xattr_name *kname, const char __user *name);
 
-ssize_t do_getxattr(struct mnt_idmap *idmap,
-		    struct dentry *d,
-		    struct xattr_ctx *ctx);
-
-int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
-int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
-		struct xattr_ctx *ctx);
 int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
 
 #ifdef CONFIG_FS_POSIX_ACL

fs/namei.c

@@ -211,22 +211,38 @@ getname_flags(const char __user *filename, int flags)
 	return result;
 }
 
-struct filename *
+struct filename *getname_uflags(const char __user *filename, int uflags)
-getname_uflags(const char __user *filename, int uflags)
 {
 	int flags = (uflags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;
 
 	return getname_flags(filename, flags);
 }
 
-struct filename *
+struct filename *getname(const char __user * filename)
-getname(const char __user * filename)
 {
 	return getname_flags(filename, 0);
 }
 
-struct filename *
+struct filename *__getname_maybe_null(const char __user *pathname)
-getname_kernel(const char * filename)
+{
+	struct filename *name;
+	char c;
+
+	/* try to save on allocations; loss on um, though */
+	if (get_user(c, pathname))
+		return ERR_PTR(-EFAULT);
+	if (!c)
+		return NULL;
+
+	name = getname_flags(pathname, LOOKUP_EMPTY);
+	if (!IS_ERR(name) && !(name->name[0])) {
+		putname(name);
+		name = NULL;
+	}
+	return name;
+}
+
+struct filename *getname_kernel(const char * filename)
 {
 	struct filename *result;
 	int len = strlen(filename) + 1;
@@ -264,7 +280,7 @@ EXPORT_SYMBOL(getname_kernel);
 
 void putname(struct filename *name)
 {
-	if (IS_ERR(name))
+	if (IS_ERR_OR_NULL(name))
 		return;
 
 	if (WARN_ON_ONCE(!atomic_read(&name->refcnt)))
@@ -629,6 +645,7 @@ struct nameidata {
 		unsigned seq;
 	} *stack, internal[EMBEDDED_LEVELS];
 	struct filename	*name;
+	const char *pathname;
 	struct nameidata *saved;
 	unsigned	root_seq;
 	int		dfd;
@@ -647,6 +664,7 @@ static void __set_nameidata(struct nameidata *p, int dfd, struct filename *name)
 	p->depth = 0;
 	p->dfd = dfd;
 	p->name = name;
+	p->pathname = likely(name) ? name->name : "";
 	p->path.mnt = NULL;
 	p->path.dentry = NULL;
 	p->total_link_count = old ? old->total_link_count : 0;
@@ -2480,7 +2498,7 @@ OK:
 static const char *path_init(struct nameidata *nd, unsigned flags)
 {
 	int error;
-	const char *s = nd->name->name;
+	const char *s = nd->pathname;
 
 	/* LOOKUP_CACHED requires RCU, ask caller to retry */
 	if ((flags & (LOOKUP_RCU | LOOKUP_CACHED)) == LOOKUP_CACHED)

fs/stat.c

@@ -368,18 +368,11 @@ int vfs_fstatat(int dfd, const char __user *filename,
 {
 	int ret;
 	int statx_flags = flags | AT_NO_AUTOMOUNT;
-	struct filename *name;
+	struct filename *name = getname_maybe_null(filename, flags);
 
-	/*
+	if (!name && dfd >= 0)
-	 * Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
-	 *
-	 * If AT_EMPTY_PATH is set, we expect the common case to be that
-	 * empty path, and avoid doing all the extra pathname work.
-	 */
-	if (flags == AT_EMPTY_PATH && vfs_empty_path(dfd, filename))
 		return vfs_fstat(dfd, stat);
 
-	name = getname_flags(filename, getname_statx_lookup_flags(statx_flags));
 	ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
 	putname(name);
 
@@ -816,24 +809,11 @@ SYSCALL_DEFINE5(statx,
 		struct statx __user *, buffer)
 {
 	int ret;
-	unsigned lflags;
+	struct filename *name = getname_maybe_null(filename, flags);
-	struct filename *name;
 
-	/*
+	if (!name && dfd >= 0)
-	 * Short-circuit handling of NULL and "" paths.
-	 *
-	 * For a NULL path we require and accept only the AT_EMPTY_PATH flag
-	 * (possibly |'d with AT_STATX flags).
-	 *
-	 * However, glibc on 32-bit architectures implements fstatat as statx
-	 * with the "" pathname and AT_NO_AUTOMOUNT | AT_EMPTY_PATH flags.
-	 * Supporting this results in the uglification below.
-	 */
-	lflags = flags & ~(AT_NO_AUTOMOUNT | AT_STATX_SYNC_TYPE);
-	if (lflags == AT_EMPTY_PATH && vfs_empty_path(dfd, filename))
 		return do_statx_fd(dfd, flags & ~AT_NO_AUTOMOUNT, mask, buffer);
 
-	name = getname_flags(filename, getname_statx_lookup_flags(flags));
 	ret = do_statx(dfd, name, flags, mask, buffer);
 	putname(name);
 

fs/xattr.c

@@ -586,25 +586,32 @@ retry_deleg:
 }
 EXPORT_SYMBOL_GPL(vfs_removexattr);
 
+int import_xattr_name(struct xattr_name *kname, const char __user *name)
+{
+	int error = strncpy_from_user(kname->name, name,
+					sizeof(kname->name));
+	if (error == 0 || error == sizeof(kname->name))
+		return -ERANGE;
+	if (error < 0)
+		return error;
+	return 0;
+}
+
 /*
  * Extended attribute SET operations
  */
 
-int setxattr_copy(const char __user *name, struct xattr_ctx *ctx)
+int setxattr_copy(const char __user *name, struct kernel_xattr_ctx *ctx)
 {
 	int error;
 
 	if (ctx->flags & ~(XATTR_CREATE|XATTR_REPLACE))
 		return -EINVAL;
 
-	error = strncpy_from_user(ctx->kname->name, name,
+	error = import_xattr_name(ctx->kname, name);
-				sizeof(ctx->kname->name));
+	if (error)
-	if (error == 0 || error == sizeof(ctx->kname->name))
-		return  -ERANGE;
-	if (error < 0)
 		return error;
 
-	error = 0;
 	if (ctx->size) {
 		if (ctx->size > XATTR_SIZE_MAX)
 			return -E2BIG;
@@ -619,8 +626,8 @@ int setxattr_copy(const char __user *name, struct 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 xattr_ctx *ctx)
+		struct kernel_xattr_ctx *ctx)
 {
 	if (is_posix_acl_xattr(ctx->kname->name))
 		return do_set_acl(idmap, dentry, ctx->kname->name,
@@ -630,32 +637,32 @@ int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
 			ctx->kvalue, ctx->size, ctx->flags);
 }
 
-static int path_setxattr(const char __user *pathname,
+int file_setxattr(struct file *f, struct kernel_xattr_ctx *ctx)
-			 const char __user *name, const void __user *value,
+{
-			 size_t size, int flags, unsigned int lookup_flags)
+	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 xattr_name kname;
-	struct xattr_ctx ctx = {
-		.cvalue   = value,
-		.kvalue   = NULL,
-		.size     = size,
-		.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);
+	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);
+		error = do_setxattr(mnt_idmap(path.mnt), path.dentry, ctx);
 		mnt_drop_write(path.mnt);
 	}
 	path_put(&path);
@@ -665,80 +672,121 @@ retry:
 	}
 
 out:
+	putname(filename);
+	return error;
+}
+
+static int path_setxattrat(int dfd, const char __user *pathname,
+			   unsigned int at_flags, const char __user *name,
+			   const void __user *value, size_t size, int flags)
+{
+	struct xattr_name kname;
+	struct kernel_xattr_ctx ctx = {
+		.cvalue	= value,
+		.kvalue	= NULL,
+		.size	= size,
+		.kname	= &kname,
+		.flags	= flags,
+	};
+	struct filename *filename;
+	unsigned int lookup_flags = 0;
+	int error;
+
+	if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+		return -EINVAL;
+
+	if (!(at_flags & AT_SYMLINK_NOFOLLOW))
+		lookup_flags = LOOKUP_FOLLOW;
+
+	error = setxattr_copy(name, &ctx);
+	if (error)
+		return error;
+
+	filename = getname_maybe_null(pathname, at_flags);
+	if (!filename) {
+		CLASS(fd, f)(dfd);
+		if (fd_empty(f))
+			error = -EBADF;
+		else
+			error = file_setxattr(fd_file(f), &ctx);
+	} else {
+		error = filename_setxattr(dfd, filename, lookup_flags, &ctx);
+	}
 	kvfree(ctx.kvalue);
 	return error;
 }
 
+SYSCALL_DEFINE6(setxattrat, int, dfd, const char __user *, pathname, unsigned int, at_flags,
+		const char __user *, name, const struct xattr_args __user *, uargs,
+		size_t, usize)
+{
+	struct xattr_args args = {};
+	int error;
+
+	BUILD_BUG_ON(sizeof(struct xattr_args) < XATTR_ARGS_SIZE_VER0);
+	BUILD_BUG_ON(sizeof(struct xattr_args) != XATTR_ARGS_SIZE_LATEST);
+
+	if (unlikely(usize < XATTR_ARGS_SIZE_VER0))
+		return -EINVAL;
+	if (usize > PAGE_SIZE)
+		return -E2BIG;
+
+	error = copy_struct_from_user(&args, sizeof(args), uargs, usize);
+	if (error)
+		return error;
+
+	return path_setxattrat(dfd, pathname, at_flags, name,
+			       u64_to_user_ptr(args.value), args.size,
+			       args.flags);
+}
+
 SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
 		const char __user *, name, const void __user *, value,
 		size_t, size, int, flags)
 {
-	return path_setxattr(pathname, name, value, size, flags, LOOKUP_FOLLOW);
+	return path_setxattrat(AT_FDCWD, pathname, 0, name, value, size, flags);
 }
 
 SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname,
 		const char __user *, name, const void __user *, value,
 		size_t, size, int, flags)
 {
-	return path_setxattr(pathname, name, value, size, flags, 0);
+	return path_setxattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, name,
+			       value, size, flags);
 }
 
 SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
 		const void __user *,value, size_t, size, int, flags)
 {
-	struct xattr_name kname;
+	return path_setxattrat(fd, NULL, AT_EMPTY_PATH, name,
-	struct xattr_ctx ctx = {
+			       value, size, flags);
-		.cvalue   = value,
-		.kvalue   = NULL,
-		.size     = size,
-		.kname    = &kname,
-		.flags    = flags,
-	};
-	int error;
-
-	CLASS(fd, f)(fd);
-	if (!fd_file(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));
-	}
-	kvfree(ctx.kvalue);
-	return error;
 }
 
 /*
  * Extended attribute GET operations
  */
-ssize_t
+static ssize_t
 do_getxattr(struct mnt_idmap *idmap, struct dentry *d,
-	struct xattr_ctx *ctx)
+	struct kernel_xattr_ctx *ctx)
 {
 	ssize_t error;
 	char *kname = ctx->kname->name;
+	void *kvalue = NULL;
 
 	if (ctx->size) {
 		if (ctx->size > XATTR_SIZE_MAX)
 			ctx->size = XATTR_SIZE_MAX;
-		ctx->kvalue = kvzalloc(ctx->size, GFP_KERNEL);
+		kvalue = kvzalloc(ctx->size, GFP_KERNEL);
-		if (!ctx->kvalue)
+		if (!kvalue)
 			return -ENOMEM;
 	}
 
-	if (is_posix_acl_xattr(ctx->kname->name))
+	if (is_posix_acl_xattr(kname))
-		error = do_get_acl(idmap, d, kname, ctx->kvalue, ctx->size);
+		error = do_get_acl(idmap, d, kname, kvalue, ctx->size);
 	else
-		error = vfs_getxattr(idmap, d, kname, ctx->kvalue, ctx->size);
+		error = vfs_getxattr(idmap, d, kname, kvalue, ctx->size);
 	if (error > 0) {
-		if (ctx->size && copy_to_user(ctx->value, ctx->kvalue, error))
+		if (ctx->size && copy_to_user(ctx->value, kvalue, error))
 			error = -EFAULT;
 	} else if (error == -ERANGE && ctx->size >= XATTR_SIZE_MAX) {
 		/* The file system tried to returned a value bigger
@@ -746,79 +794,114 @@ do_getxattr(struct mnt_idmap *idmap, struct dentry *d,
 		error = -E2BIG;
 	}
 
+	kvfree(kvalue);
 	return error;
 }
 
-static ssize_t
+ssize_t file_getxattr(struct file *f, struct kernel_xattr_ctx *ctx)
-getxattr(struct mnt_idmap *idmap, struct dentry *d,
-	 const char __user *name, void __user *value, size_t size)
 {
-	ssize_t error;
+	audit_file(f);
-	struct xattr_name kname;
+	return do_getxattr(file_mnt_idmap(f), f->f_path.dentry, ctx);
-	struct xattr_ctx ctx = {
-		.value    = value,
-		.kvalue   = NULL,
-		.size     = size,
-		.kname    = &kname,
-		.flags    = 0,
-	};
-
-	error = strncpy_from_user(kname.name, name, sizeof(kname.name));
-	if (error == 0 || error == sizeof(kname.name))
-		error = -ERANGE;
-	if (error < 0)
-		return error;
-
-	error =  do_getxattr(idmap, d, &ctx);
-
-	kvfree(ctx.kvalue);
-	return error;
 }
 
-static ssize_t path_getxattr(const char __user *pathname,
+/* unconditionally consumes filename */
-			     const char __user *name, void __user *value,
+ssize_t filename_getxattr(int dfd, struct filename *filename,
-			     size_t size, unsigned int lookup_flags)
+			  unsigned int lookup_flags, struct kernel_xattr_ctx *ctx)
 {
 	struct path path;
 	ssize_t error;
 retry:
-	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+	error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
 	if (error)
-		return error;
+		goto out;
-	error = getxattr(mnt_idmap(path.mnt), path.dentry, name, value, size);
+	error = do_getxattr(mnt_idmap(path.mnt), path.dentry, ctx);
 	path_put(&path);
 	if (retry_estale(error, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;
 		goto retry;
 	}
+out:
+	putname(filename);
 	return error;
 }
 
+static ssize_t path_getxattrat(int dfd, const char __user *pathname,
+			       unsigned int at_flags, const char __user *name,
+			       void __user *value, size_t size)
+{
+	struct xattr_name kname;
+	struct kernel_xattr_ctx ctx = {
+		.value    = value,
+		.size     = size,
+		.kname    = &kname,
+		.flags    = 0,
+	};
+	struct filename *filename;
+	ssize_t error;
+
+	if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+		return -EINVAL;
+
+	error = import_xattr_name(&kname, name);
+	if (error)
+		return error;
+
+	filename = getname_maybe_null(pathname, at_flags);
+	if (!filename) {
+		CLASS(fd, f)(dfd);
+		if (fd_empty(f))
+			return -EBADF;
+		return file_getxattr(fd_file(f), &ctx);
+	} else {
+		int lookup_flags = 0;
+		if (!(at_flags & AT_SYMLINK_NOFOLLOW))
+			lookup_flags = LOOKUP_FOLLOW;
+		return filename_getxattr(dfd, filename, lookup_flags, &ctx);
+	}
+}
+
+SYSCALL_DEFINE6(getxattrat, int, dfd, const char __user *, pathname, unsigned int, at_flags,
+		const char __user *, name, struct xattr_args __user *, uargs, size_t, usize)
+{
+	struct xattr_args args = {};
+	int error;
+
+	BUILD_BUG_ON(sizeof(struct xattr_args) < XATTR_ARGS_SIZE_VER0);
+	BUILD_BUG_ON(sizeof(struct xattr_args) != XATTR_ARGS_SIZE_LATEST);
+
+	if (unlikely(usize < XATTR_ARGS_SIZE_VER0))
+		return -EINVAL;
+	if (usize > PAGE_SIZE)
+		return -E2BIG;
+
+	error = copy_struct_from_user(&args, sizeof(args), uargs, usize);
+	if (error)
+		return error;
+
+	if (args.flags != 0)
+		return -EINVAL;
+
+	return path_getxattrat(dfd, pathname, at_flags, name,
+			       u64_to_user_ptr(args.value), args.size);
+}
+
 SYSCALL_DEFINE4(getxattr, const char __user *, pathname,
 		const char __user *, name, void __user *, value, size_t, size)
 {
-	return path_getxattr(pathname, name, value, size, LOOKUP_FOLLOW);
+	return path_getxattrat(AT_FDCWD, pathname, 0, name, value, size);
 }
 
 SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname,
 		const char __user *, name, void __user *, value, size_t, size)
 {
-	return path_getxattr(pathname, name, value, size, 0);
+	return path_getxattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, name,
+			       value, size);
 }
 
 SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
 		void __user *, value, size_t, size)
 {
-	struct fd f = fdget(fd);
+	return path_getxattrat(fd, NULL, AT_EMPTY_PATH, name, value, size);
-	ssize_t error = -EBADF;
-
-	if (!fd_file(f))
-		return error;
-	audit_file(fd_file(f));
-	error = getxattr(file_mnt_idmap(fd_file(f)), fd_file(f)->f_path.dentry,
-			 name, value, size);
-	fdput(f);
-	return error;
 }
 
 /*
@@ -853,47 +936,80 @@ listxattr(struct dentry *d, char __user *list, size_t size)
 	return error;
 }
 
-static ssize_t path_listxattr(const char __user *pathname, char __user *list,
+static
-			      size_t size, unsigned int lookup_flags)
+ssize_t file_listxattr(struct file *f, char __user *list, size_t size)
+{
+	audit_file(f);
+	return listxattr(f->f_path.dentry, list, size);
+}
+
+/* unconditionally consumes filename */
+static
+ssize_t filename_listxattr(int dfd, struct filename *filename,
+			   unsigned int lookup_flags,
+			   char __user *list, size_t size)
 {
 	struct path path;
 	ssize_t error;
 retry:
-	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+	error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
 	if (error)
-		return error;
+		goto out;
 	error = listxattr(path.dentry, list, size);
 	path_put(&path);
 	if (retry_estale(error, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;
 		goto retry;
 	}
+out:
+	putname(filename);
 	return error;
 }
 
+static ssize_t path_listxattrat(int dfd, const char __user *pathname,
+				unsigned int at_flags, char __user *list,
+				size_t size)
+{
+	struct filename *filename;
+	int lookup_flags;
+
+	if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+		return -EINVAL;
+
+	filename = getname_maybe_null(pathname, at_flags);
+	if (!filename) {
+		CLASS(fd, f)(dfd);
+		if (fd_empty(f))
+			return -EBADF;
+		return file_listxattr(fd_file(f), list, size);
+	}
+
+	lookup_flags = (at_flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+	return filename_listxattr(dfd, filename, lookup_flags, list, size);
+}
+
+SYSCALL_DEFINE5(listxattrat, int, dfd, const char __user *, pathname,
+		unsigned int, at_flags,
+		char __user *, list, size_t, size)
+{
+	return path_listxattrat(dfd, pathname, at_flags, list, size);
+}
+
 SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,
 		size_t, size)
 {
-	return path_listxattr(pathname, list, size, LOOKUP_FOLLOW);
+	return path_listxattrat(AT_FDCWD, pathname, 0, list, size);
 }
 
 SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list,
 		size_t, size)
 {
-	return path_listxattr(pathname, list, size, 0);
+	return path_listxattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, list, size);
 }
 
 SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
 {
-	struct fd f = fdget(fd);
+	return path_listxattrat(fd, NULL, AT_EMPTY_PATH, list, size);
-	ssize_t error = -EBADF;
-
-	if (!fd_file(f))
-		return error;
-	audit_file(fd_file(f));
-	error = listxattr(fd_file(f)->f_path.dentry, list, size);
-	fdput(f);
-	return error;
 }
 
 /*
@@ -907,25 +1023,33 @@ removexattr(struct mnt_idmap *idmap, struct dentry *d, const char *name)
 	return vfs_removexattr(idmap, d, name);
 }
 
-static int path_removexattr(const char __user *pathname,
+static int file_removexattr(struct file *f, struct xattr_name *kname)
-			    const char __user *name, unsigned int lookup_flags)
+{
+	int error = mnt_want_write_file(f);
+
+	if (!error) {
+		audit_file(f);
+		error = removexattr(file_mnt_idmap(f),
+				    f->f_path.dentry, kname->name);
+		mnt_drop_write_file(f);
+	}
+	return error;
+}
+
+/* unconditionally consumes filename */
+static int filename_removexattr(int dfd, struct filename *filename,
+				unsigned int lookup_flags, struct xattr_name *kname)
 {
 	struct path path;
 	int error;
-	char kname[XATTR_NAME_MAX + 1];
 
-	error = strncpy_from_user(kname, name, sizeof(kname));
-	if (error == 0 || error == sizeof(kname))
-		error = -ERANGE;
-	if (error < 0)
-		return error;
 retry:
-	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+	error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
 	if (error)
-		return error;
+		goto out;
 	error = mnt_want_write(path.mnt);
 	if (!error) {
-		error = removexattr(mnt_idmap(path.mnt), path.dentry, kname);
+		error = removexattr(mnt_idmap(path.mnt), path.dentry, kname->name);
 		mnt_drop_write(path.mnt);
 	}
 	path_put(&path);
@@ -933,45 +1057,58 @@ retry:
 		lookup_flags |= LOOKUP_REVAL;
 		goto retry;
 	}
+out:
+	putname(filename);
 	return error;
 }
 
+static int path_removexattrat(int dfd, const char __user *pathname,
+			      unsigned int at_flags, const char __user *name)
+{
+	struct xattr_name kname;
+	struct filename *filename;
+	unsigned int lookup_flags;
+	int error;
+
+	if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+		return -EINVAL;
+
+	error = import_xattr_name(&kname, name);
+	if (error)
+		return error;
+
+	filename = getname_maybe_null(pathname, at_flags);
+	if (!filename) {
+		CLASS(fd, f)(dfd);
+		if (fd_empty(f))
+			return -EBADF;
+		return file_removexattr(fd_file(f), &kname);
+	}
+	lookup_flags = (at_flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+	return filename_removexattr(dfd, filename, lookup_flags, &kname);
+}
+
+SYSCALL_DEFINE4(removexattrat, int, dfd, const char __user *, pathname,
+		unsigned int, at_flags, const char __user *, name)
+{
+	return path_removexattrat(dfd, pathname, at_flags, name);
+}
+
 SYSCALL_DEFINE2(removexattr, const char __user *, pathname,
 		const char __user *, name)
 {
-	return path_removexattr(pathname, name, LOOKUP_FOLLOW);
+	return path_removexattrat(AT_FDCWD, pathname, 0, name);
 }
 
 SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname,
 		const char __user *, name)
 {
-	return path_removexattr(pathname, name, 0);
+	return path_removexattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, name);
 }
 
 SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
 {
-	struct fd f = fdget(fd);
+	return path_removexattrat(fd, NULL, AT_EMPTY_PATH, name);
-	char kname[XATTR_NAME_MAX + 1];
-	int error = -EBADF;
-
-	if (!fd_file(f))
-		return error;
-	audit_file(fd_file(f));
-
-	error = strncpy_from_user(kname, name, sizeof(kname));
-	if (error == 0 || error == sizeof(kname))
-		error = -ERANGE;
-	if (error < 0)
-		return error;
-
-	error = mnt_want_write_file(fd_file(f));
-	if (!error) {
-		error = removexattr(file_mnt_idmap(fd_file(f)),
-				    fd_file(f)->f_path.dentry, kname);
-		mnt_drop_write_file(fd_file(f));
-	}
-	fdput(f);
-	return error;
 }
 
 int xattr_list_one(char **buffer, ssize_t *remaining_size, const char *name)
@@ -1005,9 +1142,10 @@ generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 {
 	const struct xattr_handler *handler, * const *handlers = dentry->d_sb->s_xattr;
 	ssize_t remaining_size = buffer_size;
-	int err = 0;
 
 	for_each_xattr_handler(handlers, handler) {
+		int err;
+
 		if (!handler->name || (handler->list && !handler->list(dentry)))
 			continue;
 		err = xattr_list_one(&buffer, &remaining_size, handler->name);
@@ -1015,7 +1153,7 @@ generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 			return err;
 	}
 
-	return err ? err : buffer_size - remaining_size;
+	return buffer_size - remaining_size;
 }
 EXPORT_SYMBOL(generic_listxattr);
 

include/asm-generic/audit_change_attr.h

@@ -11,9 +11,15 @@ __NR_lchown,
 __NR_fchown,
 #endif
 __NR_setxattr,
+#ifdef __NR_setxattrat
+__NR_setxattrat,
+#endif
 __NR_lsetxattr,
 __NR_fsetxattr,
 __NR_removexattr,
+#ifdef __NR_removexattrat
+__NR_removexattrat,
+#endif
 __NR_lremovexattr,
 __NR_fremovexattr,
 #ifdef __NR_fchownat

include/linux/fs.h

@@ -2789,6 +2789,16 @@ extern struct filename *getname_flags(const char __user *, int);
 extern struct filename *getname_uflags(const char __user *, int);
 extern struct filename *getname(const char __user *);
 extern struct filename *getname_kernel(const char *);
+extern struct filename *__getname_maybe_null(const char __user *);
+static inline struct filename *getname_maybe_null(const char __user *name, int flags)
+{
+	if (!(flags & AT_EMPTY_PATH))
+		return getname(name);
+
+	if (!name)
+		return NULL;
+	return __getname_maybe_null(name);
+}
 extern void putname(struct filename *name);
 
 extern int finish_open(struct file *file, struct dentry *dentry,

include/linux/syscalls.h

@@ -77,6 +77,7 @@ struct cachestat_range;
 struct cachestat;
 struct statmount;
 struct mnt_id_req;
+struct xattr_args;
 
 #include <linux/types.h>
 #include <linux/aio_abi.h>
@@ -338,23 +339,35 @@ asmlinkage long sys_io_uring_register(unsigned int fd, unsigned int op,
 				void __user *arg, unsigned int nr_args);
 asmlinkage long sys_setxattr(const char __user *path, const char __user *name,
 			     const void __user *value, size_t size, int flags);
+asmlinkage long sys_setxattrat(int dfd, const char __user *path, unsigned int at_flags,
+			       const char __user *name,
+			       const struct xattr_args __user *args, size_t size);
 asmlinkage long sys_lsetxattr(const char __user *path, const char __user *name,
 			      const void __user *value, size_t size, int flags);
 asmlinkage long sys_fsetxattr(int fd, const char __user *name,
 			      const void __user *value, size_t size, int flags);
 asmlinkage long sys_getxattr(const char __user *path, const char __user *name,
 			     void __user *value, size_t size);
+asmlinkage long sys_getxattrat(int dfd, const char __user *path, unsigned int at_flags,
+			       const char __user *name,
+			       struct xattr_args __user *args, size_t size);
 asmlinkage long sys_lgetxattr(const char __user *path, const char __user *name,
 			      void __user *value, size_t size);
 asmlinkage long sys_fgetxattr(int fd, const char __user *name,
 			      void __user *value, size_t size);
 asmlinkage long sys_listxattr(const char __user *path, char __user *list,
 			      size_t size);
+asmlinkage long sys_listxattrat(int dfd, const char __user *path,
+				unsigned int at_flags,
+				char __user *list, size_t size);
 asmlinkage long sys_llistxattr(const char __user *path, char __user *list,
 			       size_t size);
 asmlinkage long sys_flistxattr(int fd, char __user *list, size_t size);
 asmlinkage long sys_removexattr(const char __user *path,
 				const char __user *name);
+asmlinkage long sys_removexattrat(int dfd, const char __user *path,
+				  unsigned int at_flags,
+				  const char __user *name);
 asmlinkage long sys_lremovexattr(const char __user *path,
 				 const char __user *name);
 asmlinkage long sys_fremovexattr(int fd, const char __user *name);

include/linux/xattr.h

@@ -19,6 +19,10 @@
 #include <linux/user_namespace.h>
 #include <uapi/linux/xattr.h>
 
+/* List of all open_how "versions". */
+#define XATTR_ARGS_SIZE_VER0	16 /* sizeof first published struct */
+#define XATTR_ARGS_SIZE_LATEST	XATTR_ARGS_SIZE_VER0
+
 struct inode;
 struct dentry;
 

include/uapi/asm-generic/unistd.h

@@ -841,8 +841,17 @@ __SYSCALL(__NR_lsm_list_modules, sys_lsm_list_modules)
 #define __NR_mseal 462
 __SYSCALL(__NR_mseal, sys_mseal)
 
+#define __NR_setxattrat 463
+__SYSCALL(__NR_setxattrat, sys_setxattrat)
+#define __NR_getxattrat 464
+__SYSCALL(__NR_getxattrat, sys_getxattrat)
+#define __NR_listxattrat 465
+__SYSCALL(__NR_listxattrat, sys_listxattrat)
+#define __NR_removexattrat 466
+__SYSCALL(__NR_removexattrat, sys_removexattrat)
+
 #undef __NR_syscalls
-#define __NR_syscalls 463
+#define __NR_syscalls 467
 
 /*
  * 32 bit systems traditionally used different

include/uapi/linux/xattr.h

@@ -11,6 +11,7 @@
 */
 
 #include <linux/libc-compat.h>
+#include <linux/types.h>
 
 #ifndef _UAPI_LINUX_XATTR_H
 #define _UAPI_LINUX_XATTR_H
@@ -20,6 +21,12 @@
 
 #define XATTR_CREATE	0x1	/* set value, fail if attr already exists */
 #define XATTR_REPLACE	0x2	/* set value, fail if attr does not exist */
+
+struct xattr_args {
+	__aligned_u64 __user value;
+	__u32 size;
+	__u32 flags;
+};
 #endif
 
 /* Namespaces */

io_uring/xattr.c

@@ -18,7 +18,7 @@
 
 struct io_xattr {
 	struct file			*file;
-	struct xattr_ctx		ctx;
+	struct kernel_xattr_ctx		ctx;
 	struct filename			*filename;
 };
 
@@ -48,13 +48,10 @@ static int __io_getxattr_prep(struct io_kiocb *req,
 	const char __user *name;
 	int ret;
 
-	if (unlikely(req->flags & REQ_F_FIXED_FILE))
-		return -EBADF;
-
 	ix->filename = NULL;
 	ix->ctx.kvalue = NULL;
 	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+	ix->ctx.value = u64_to_user_ptr(READ_ONCE(sqe->addr2));
 	ix->ctx.size = READ_ONCE(sqe->len);
 	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
 
@@ -65,11 +62,8 @@ static int __io_getxattr_prep(struct io_kiocb *req,
 	if (!ix->ctx.kname)
 		return -ENOMEM;
 
-	ret = strncpy_from_user(ix->ctx.kname->name, name,
+	ret = import_xattr_name(ix->ctx.kname, name);
-				sizeof(ix->ctx.kname->name));
+	if (ret) {
-	if (!ret || ret == sizeof(ix->ctx.kname->name))
-		ret = -ERANGE;
-	if (ret < 0) {
 		kfree(ix->ctx.kname);
 		return ret;
 	}
@@ -90,19 +84,20 @@ int io_getxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	const char __user *path;
 	int ret;
 
+	if (unlikely(req->flags & REQ_F_FIXED_FILE))
+		return -EBADF;
+
 	ret = __io_getxattr_prep(req, sqe);
 	if (ret)
 		return ret;
 
 	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
 
-	ix->filename = getname_flags(path, LOOKUP_FOLLOW);
+	ix->filename = getname(path);
-	if (IS_ERR(ix->filename)) {
+	if (IS_ERR(ix->filename))
-		ret = PTR_ERR(ix->filename);
+		return PTR_ERR(ix->filename);
-		ix->filename = NULL;
-	}
 
-	return ret;
+	return 0;
 }
 
 int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
@@ -112,10 +107,7 @@ int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
 
 	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
 
-	ret = do_getxattr(file_mnt_idmap(req->file),
+	ret = file_getxattr(req->file, &ix->ctx);
-			req->file->f_path.dentry,
-			&ix->ctx);
-
 	io_xattr_finish(req, ret);
 	return IOU_OK;
 }
@@ -123,24 +115,12 @@ int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
 int io_getxattr(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_getxattr(AT_FDCWD, ix->filename, LOOKUP_FOLLOW, &ix->ctx);
-	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+	ix->filename = NULL;
-	if (!ret) {
-		ret = do_getxattr(mnt_idmap(path.mnt), path.dentry, &ix->ctx);
-
-		path_put(&path);
-		if (retry_estale(ret, lookup_flags)) {
-			lookup_flags |= LOOKUP_REVAL;
-			goto retry;
-		}
-	}
-
 	io_xattr_finish(req, ret);
 	return IOU_OK;
 }
@@ -152,9 +132,6 @@ static int __io_setxattr_prep(struct io_kiocb *req,
 	const char __user *name;
 	int ret;
 
-	if (unlikely(req->flags & REQ_F_FIXED_FILE))
-		return -EBADF;
-
 	ix->filename = NULL;
 	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
 	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
@@ -183,19 +160,20 @@ int io_setxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	const char __user *path;
 	int ret;
 
+	if (unlikely(req->flags & REQ_F_FIXED_FILE))
+		return -EBADF;
+
 	ret = __io_setxattr_prep(req, sqe);
 	if (ret)
 		return ret;
 
 	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
 
-	ix->filename = getname_flags(path, LOOKUP_FOLLOW);
+	ix->filename = getname(path);
-	if (IS_ERR(ix->filename)) {
+	if (IS_ERR(ix->filename))
-		ret = PTR_ERR(ix->filename);
+		return PTR_ERR(ix->filename);
-		ix->filename = NULL;
-	}
 
-	return ret;
+	return 0;
 }
 
 int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
@@ -203,28 +181,14 @@ 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,
+int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
-			const struct path *path)
 {
 	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;
 }
@@ -232,23 +196,12 @@ 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_setxattr(AT_FDCWD, ix->filename, LOOKUP_FOLLOW, &ix->ctx);
-	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+	ix->filename = 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;
-		}
-	}
-
 	io_xattr_finish(req, ret);
 	return IOU_OK;
 }

scripts/syscall.tbl

@@ -403,3 +403,7 @@
 460	common	lsm_set_self_attr		sys_lsm_set_self_attr
 461	common	lsm_list_modules		sys_lsm_list_modules
 462	common	mseal				sys_mseal
+463	common	setxattrat			sys_setxattrat
+464	common	getxattrat			sys_getxattrat
+465	common	listxattrat			sys_listxattrat
+466	common	removexattrat			sys_removexattrat