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kernel: Fix execve filename access on ARM64

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weishu
2025-11-27 03:17:59 +00:00
committed by shirkneko
parent 3a97e6580f
commit 5e64eee624
6 changed files with 135 additions and 92 deletions
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87
kernel/sucompat.c
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@@ -18,28 +18,13 @@
#include "ksud.h"
#include "sucompat.h"
#include "app_profile.h"
#include "util.h"
#include "sulog.h"
#define SU_PATH "/system/bin/su"
#define SH_PATH "/system/bin/sh"
#ifndef preempt_enable_no_resched_notrace
#define preempt_enable_no_resched_notrace() \
do { \
barrier(); \
__preempt_count_dec(); \
} while (0)
#endif
#ifndef preempt_disable_notrace
#define preempt_disable_notrace() \
do { \
__preempt_count_inc(); \
barrier(); \
} while (0)
#endif
bool ksu_su_compat_enabled __read_mostly = true;
static int su_compat_feature_get(u64 *value)
@@ -86,76 +71,6 @@ static char __user *ksud_user_path(void)
return userspace_stack_buffer(ksud_path, sizeof(ksud_path));
}
static bool try_set_access_flag(unsigned long addr)
{
#ifdef CONFIG_ARM64
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *ptep, pte;
spinlock_t *ptl;
bool ret = false;
if (!mm)
return false;
if (!mmap_read_trylock(mm))
return false;
vma = find_vma(mm, addr);
if (!vma || addr < vma->vm_start)
goto out_unlock;
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
goto out_unlock;
p4d = p4d_offset(pgd, addr);
if (!p4d_present(*p4d))
goto out_unlock;
pud = pud_offset(p4d, addr);
if (!pud_present(*pud))
goto out_unlock;
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd))
goto out_unlock;
if (pmd_trans_huge(*pmd))
goto out_unlock;
ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
if (!ptep)
goto out_unlock;
pte = *ptep;
if (!pte_present(pte))
goto out_pte_unlock;
if (pte_young(pte)) {
ret = true;
goto out_pte_unlock;
}
ptep_set_access_flags(vma, addr, ptep, pte_mkyoung(pte), 0);
pr_info("set AF for addr %lx\n", addr);
ret = true;
out_pte_unlock:
pte_unmap_unlock(ptep, ptl);
out_unlock:
mmap_read_unlock(mm);
return ret;
#else
return false;
#endif
}
int ksu_handle_faccessat(int *dfd, const char __user **filename_user, int *mode,
int *__unused_flags)
{