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/ext4/Kconfig | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 fs/ext4/Kconfig (limited to 'fs/ext4/Kconfig') diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig new file mode 100644 index 000000000..01873c2a3 --- /dev/null +++ b/fs/ext4/Kconfig @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: GPL-2.0-only +config EXT4_FS + tristate "The Extended 4 (ext4) filesystem" + select BUFFER_HEAD + select JBD2 + select CRC16 + select CRC32 + select FS_IOMAP + select FS_ENCRYPTION_ALGS if FS_ENCRYPTION + help + This is the next generation of the ext3 filesystem. + + Unlike the change from ext2 filesystem to ext3 filesystem, + the on-disk format of ext4 is not forwards compatible with + ext3; it is based on extent maps and it supports 48-bit + physical block numbers. The ext4 filesystem also supports delayed + allocation, persistent preallocation, high resolution time stamps, + and a number of other features to improve performance and speed + up fsck time. For more information, please see the web pages at + http://ext4.wiki.kernel.org. + + The ext4 filesystem supports mounting an ext3 filesystem; while there + are some performance gains from the delayed allocation and inode + table readahead, the best performance gains require enabling ext4 + features in the filesystem using tune2fs, or formatting a new + filesystem as an ext4 filesystem initially. Without explicit enabling + of ext4 features, the on disk filesystem format stays fully backward + compatible. + + To compile this file system support as a module, choose M here. The + module will be called ext4. + + If unsure, say N. + +config EXT4_USE_FOR_EXT2 + bool "Use ext4 for ext2 file systems" + depends on EXT4_FS + depends on EXT2_FS=n + default y + help + Allow the ext4 file system driver code to be used for ext2 + file system mounts. This allows users to reduce their + compiled kernel size by using one file system driver for + ext2, ext3, and ext4 file systems. + +config EXT4_FS_POSIX_ACL + bool "Ext4 POSIX Access Control Lists" + depends on EXT4_FS + select FS_POSIX_ACL + help + POSIX Access Control Lists (ACLs) support permissions for users and + groups beyond the owner/group/world scheme. + + If you don't know what Access Control Lists are, say N + +config EXT4_FS_SECURITY + bool "Ext4 Security Labels" + depends on EXT4_FS + help + Security labels support alternative access control models + implemented by security modules like SELinux. This option + enables an extended attribute handler for file security + labels in the ext4 filesystem. + + If you are not using a security module that requires using + extended attributes for file security labels, say N. + +config EXT4_DEBUG + bool "Ext4 debugging support" + depends on EXT4_FS + help + Enables run-time debugging support for the ext4 filesystem. + + If you select Y here, then you will be able to turn on debugging + using dynamic debug control for mb_debug() / ext_debug() msgs. + +config EXT4_KUNIT_TESTS + tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS + depends on EXT4_FS && KUNIT + default KUNIT_ALL_TESTS + help + This builds the ext4 KUnit tests. + + KUnit tests run during boot and output the results to the debug log + in TAP format (https://testanything.org/). Only useful for kernel devs + running KUnit test harness and are not for inclusion into a production + build. + + For more information on KUnit and unit tests in general please refer + to the KUnit documentation in Documentation/dev-tools/kunit/. + + If unsure, say N. -- cgit v1.3.1