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kernel: throne_tracker: resolve s_magic for < 3.9

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throne_tracker, cross-fs avoidance:
f_inode is f_path.dentry->d_inode
so file->f_inode->i_sb->s_magic is file->f_path.dentry->d_inode->i_sb->s_magic

Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
This commit is contained in:
backslashxx
2025-06-13 18:59:08 +08:00
committed by Rifat Azad
parent f15d9b18e9
commit 600d9ce5d2
1 changed files with 11 additions and 4 deletions
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15
kernel/throne_tracker.c
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@@ -249,6 +249,13 @@ bool is_lock_held(const char *path)
return false;
}
// compat: https://elixir.bootlin.com/linux/v3.9/source/include/linux/fs.h#L771
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)
#define S_MAGIC_COMPAT(x) ((x)->f_inode->i_sb->s_magic)
#else
#define S_MAGIC_COMPAT(x) ((x)->f_path.dentry->d_inode->i_sb->s_magic)
#endif
void search_manager(const char *path, int depth, struct list_head *uid_data)
{
int i, stop = 0;
@@ -293,8 +300,8 @@ void search_manager(const char *path, int depth, struct list_head *uid_data)
// grab magic on first folder, which is /data/app
if (!data_app_magic) {
if (file->f_inode->i_sb->s_magic) {
data_app_magic = file->f_inode->i_sb->s_magic;
if (S_MAGIC_COMPAT(file)) {
data_app_magic = S_MAGIC_COMPAT(file);
pr_info("%s: dir: %s got magic! 0x%lx\n", __func__, pos->dirpath, data_app_magic);
} else {
filp_close(file, NULL);
@@ -302,9 +309,9 @@ void search_manager(const char *path, int depth, struct list_head *uid_data)
}
}
if (file->f_inode->i_sb->s_magic != data_app_magic) {
if (S_MAGIC_COMPAT(file) != data_app_magic) {
pr_info("%s: skip: %s magic: 0x%lx expected: 0x%lx\n", __func__, pos->dirpath,
file->f_inode->i_sb->s_magic, data_app_magic);
S_MAGIC_COMPAT(file), data_app_magic);
filp_close(file, NULL);
goto skip_iterate;
}