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kernel: pkg_observer: Add (half) older kernel compatibility support (#181)

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* Pre Linux 5.9, handle_inode_event did not exist. This is was covered by handle_event.
* handle_event have a lot of changes, neither in arguments counts and arguments arrangements.
* Use fsnotify_add_mark_locked instead of fsnotify_add_inode_mark for kernel pre 4.12

NOTE: fsnotify_add_mark_locked is not tested! Report bugs if you found it!

Signed-off-by: Faris <rissu.ntk@gmail.com>
This commit is contained in:
Faris
2025-11-01 17:24:59 +07:00
committed by ShirkNeko
parent afc8b53ca6
commit e0aafc66c6
1 changed files with 70 additions and 8 deletions
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78
kernel/pkg_observer.c
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@@ -2,8 +2,9 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/fsnotify_backend.h>
#include <linux/fsnotify.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/rculist.h>
#include <linux/version.h>
#include "klog.h" // IWYU pragma: keep
@@ -23,6 +24,7 @@ struct watch_dir {
static struct fsnotify_group *g;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
static int ksu_handle_inode_event(struct fsnotify_mark *mark, u32 mask,
struct inode *inode, struct inode *dir,
const struct qstr *file_name, u32 cookie)
@@ -41,9 +43,58 @@ static int ksu_handle_inode_event(struct fsnotify_mark *mark, u32 mask,
}
return 0;
}
#else
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
static int ksu_handle_event(struct fsnotify_group *group,
struct inode *inode, u32 mask, const void *data, int data_type,
const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
static int ksu_handle_event(struct fsnotify_group *group,
struct inode *inode, u32 mask, const void *data, int data_type,
const unsigned char *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
static int ksu_handle_event(struct fsnotify_group *group,
struct inode *inode, struct fsnotify_mark *inode_mark,
struct fsnotify_mark *vfsmount_mark,
u32 mask, const void *data, int data_type,
const unsigned char *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
#else
static int ksu_handle_event(struct fsnotify_group *group,
struct inode *inode,
struct fsnotify_mark *inode_mark,
struct fsnotify_mark *vfsmount_mark,
u32 mask, void *data, int data_type,
const unsigned char *file_name, u32 cookie)
#endif
{
if (!file_name)
return 0;
if (mask & FS_ISDIR)
return 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
if (file_name->len == 13 &&
!memcmp(file_name->name, "packages.list", 13)) {
#else
if (strlen(file_name) == 13 &&
!memcmp(file_name, "packages.list", 13)) {
#endif
pr_info("packages.list detected: %d\n", mask);
track_throne();
}
return 0;
}
#endif
static const struct fsnotify_ops ksu_ops = {
.handle_inode_event = ksu_handle_inode_event,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
.handle_inode_event = ksu_handle_inode_event,
#else
.handle_event = ksu_handle_event,
#endif
};
static int add_mark_on_inode(struct inode *inode, u32 mask,
@@ -58,12 +109,23 @@ static int add_mark_on_inode(struct inode *inode, u32 mask,
fsnotify_init_mark(m, g);
m->mask = mask;
if (fsnotify_add_inode_mark(m, inode, 0)) {
fsnotify_put_mark(m);
return -EINVAL;
}
*out = m;
return 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
if (fsnotify_add_inode_mark(m, inode, 0)) {
fsnotify_put_mark(m);
return -EINVAL;
}
#else /* TODO: Need more tests on k4.4 and k4.9! */
mutex_lock(&g->mark_mutex);
if (fsnotify_add_mark_locked(m, g, inode, NULL, 0)) {
fsnotify_put_mark(m);
mutex_unlock(&g->mark_mutex);
return -EINVAL;
}
mutex_unlock(&g->mark_mutex);
#endif
*out = m;
return 0;
}
static int watch_one_dir(struct watch_dir *wd)