From 3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 2 Sep 2026 15:31:14 -0700 Subject: treewide: refresh kmalloc_obj() conversions This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook --- fs/nullfs.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 fs/nullfs.c (limited to 'fs/nullfs.c') diff --git a/fs/nullfs.c b/fs/nullfs.c new file mode 100644 index 000000000..e06352c7b --- /dev/null +++ b/fs/nullfs.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2026 Christian Brauner */ +#include +#include +#include + +#include "mount.h" + +static const struct super_operations nullfs_super_operations = { + .statfs = simple_statfs, +}; + +static int nullfs_fs_fill_super(struct super_block *s, struct fs_context *fc) +{ + struct inode *inode; + + s->s_maxbytes = MAX_LFS_FILESIZE; + s->s_blocksize = PAGE_SIZE; + s->s_blocksize_bits = PAGE_SHIFT; + s->s_magic = NULL_FS_MAGIC; + s->s_op = &nullfs_super_operations; + s->s_export_op = NULL; + s->s_xattr = NULL; + s->s_time_gran = 1; + s->s_d_flags = 0; + + inode = new_inode(s); + if (!inode) + return -ENOMEM; + + /* nullfs is permanently empty... */ + make_empty_dir_inode(inode); + simple_inode_init_ts(inode); + inode->i_ino = 1; + /* ... and immutable. */ + inode->i_flags |= S_IMMUTABLE; + + s->s_root = d_make_root(inode); + if (!s->s_root) + return -ENOMEM; + + return 0; +} + +static int nullfs_fs_get_tree(struct fs_context *fc) +{ + return get_tree_nodev(fc, nullfs_fs_fill_super); +} + +static const struct fs_context_operations nullfs_fs_context_ops = { + .get_tree = nullfs_fs_get_tree, +}; + +static int nullfs_init_fs_context(struct fs_context *fc) +{ + fc->ops = &nullfs_fs_context_ops; + fc->sb_flags |= SB_NOUSER; + fc->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; + return 0; +} + +struct file_system_type nullfs_fs_type = { + .name = "nullfs", + .init_fs_context = nullfs_init_fs_context, + .kill_sb = kill_anon_super, +}; -- cgit v1.3.1