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kernel: Optimize prctl filtering

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ShirkNeko
2025-10-15 04:46:13 +08:00
parent 37300fefd4
commit 761b5ee687
1 changed files with 13 additions and 12 deletions
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23
kernel/core_hook.c
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@@ -39,6 +39,7 @@
#ifdef CONFIG_KSU_SUSFS
#include <linux/susfs.h>
#include <linux/susfs_def.h>
#endif // #ifdef CONFIG_KSU_SUSFS
#include "allowlist.h"
@@ -524,20 +525,16 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
#endif
#ifdef CONFIG_KSU_SUSFS
bool saved_umount_flag = false;
#ifdef CONFIG_KSU_MANUAL_SU
if (is_manual_su_cmd || is_system_uid()) {
saved_umount_flag = test_and_clear_ti_thread_flag(&current->thread_info, TIF_PROC_UMOUNTED);
}
#endif
// - We straight up check if process is supposed to be umounted, return 0 if so
// - This is to prevent side channel attack as much as possible
#ifdef CONFIG_KSU_MANUAL_SU
if (is_manual_su_cmd) {
if (!is_system_uid())
if (likely(!saved_umount_flag && susfs_is_current_proc_umounted()))
return 0;
} else {
if (likely(susfs_is_current_proc_umounted()))
return 0;
}
#else
if (likely(susfs_is_current_proc_umounted()))
return 0;
#endif
#endif
// if success, we modify the arg5 as result!
@@ -1377,6 +1374,10 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
}
return 0;
}
#if defined(CONFIG_KSU_SUSFS) && defined(CONFIG_KSU_MANUAL_SU)
if (unlikely(saved_umount_flag))
set_ti_thread_flag(&current->thread_info, TIF_PROC_UMOUNTED);
#endif
return 0;
}