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nilfs2: fix CFI failure when accessing /sys/fs/nilfs2/features/*

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When accessing one of the files under /sys/fs/nilfs2/features when
CONFIG_CFI_CLANG is enabled, there is a CFI violation:

  CFI failure at kobj_attr_show+0x59/0x80 (target: nilfs_feature_revision_show+0x0/0x30; expected type: 0xfc392c4d)
  ...
  Call Trace:
   <TASK>
   sysfs_kf_seq_show+0x2a6/0x390
   ? __cfi_kobj_attr_show+0x10/0x10
   kernfs_seq_show+0x104/0x15b
   seq_read_iter+0x580/0xe2b
  ...

When the kobject of the kset for /sys/fs/nilfs2 is initialized, its ktype
is set to kset_ktype, which has a ->sysfs_ops of kobj_sysfs_ops.  When
nilfs_feature_attr_group is added to that kobject via
sysfs_create_group(), the kernfs_ops of each files is sysfs_file_kfops_rw,
which will call sysfs_kf_seq_show() when ->seq_show() is called. 
sysfs_kf_seq_show() in turn calls kobj_attr_show() through
->sysfs_ops->show().  kobj_attr_show() casts the provided attribute out to
a 'struct kobj_attribute' via container_of() and calls ->show(), resulting
in the CFI violation since neither nilfs_feature_revision_show() nor
nilfs_feature_README_show() match the prototype of ->show() in 'struct
kobj_attribute'.

Resolve the CFI violation by adjusting the second parameter in
nilfs_feature_{revision,README}_show() from 'struct attribute' to 'struct
kobj_attribute' to match the expected prototype.

Link: https://lkml.kernel.org/r/20250906144410.22511-1-konishi.ryusuke@gmail.com
Fixes: aebe17f684 ("nilfs2: add /sys/fs/nilfs2/features group")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202509021646.bc78d9ef-lkp@intel.com/
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nathan Chancellor 2025-09-06 23:43:34 +09:00 • committed by Andrew Morton
parent c62cff4048
commit 025e87f8ea
2 changed files with 6 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
fs/nilfs2/sysfs.c
View file

@ -1075,7 +1075,7 @@ void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
************************************************************************/
static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
struct attribute *attr, char *buf)
struct kobj_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d.%d\n",
NILFS_CURRENT_REV, NILFS_MINOR_REV);
@ -1087,7 +1087,7 @@ static const char features_readme_str[] =
"(1) revision\n\tshow current revision of NILFS file system driver.\n";
static ssize_t nilfs_feature_README_show(struct kobject *kobj,
struct attribute *attr,
struct kobj_attribute *attr,
char *buf)
{
return sysfs_emit(buf, features_readme_str);

8
fs/nilfs2/sysfs.h
View file

@ -50,16 +50,16 @@ struct nilfs_sysfs_dev_subgroups {
struct completion sg_segments_kobj_unregister;
};
#define NILFS_COMMON_ATTR_STRUCT(name) \
#define NILFS_KOBJ_ATTR_STRUCT(name) \
struct nilfs_##name##_attr { \
struct attribute attr; \
ssize_t (*show)(struct kobject *, struct attribute *, \
ssize_t (*show)(struct kobject *, struct kobj_attribute *, \
char *); \
ssize_t (*store)(struct kobject *, struct attribute *, \
ssize_t (*store)(struct kobject *, struct kobj_attribute *, \
const char *, size_t); \
}
NILFS_COMMON_ATTR_STRUCT(feature);
NILFS_KOBJ_ATTR_STRUCT(feature);
#define NILFS_DEV_ATTR_STRUCT(name) \
struct nilfs_##name##_attr { \