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kernel: expose allowlist workaround as Kconfig option

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Useful for situations where the SU allowlist is not kept after a reboot.
As per upstream this is only used for < 4.10 and Huawei HiSilicon devices.
but theres user reports having issues even on 4.14/4.19 samsung kernels.
Expose this option so users affected can opt-in.

Discussion:
	tiann#1249
	tiann#1346

References:
	tiann@f57d351
	tiann@b61cb30

Credits to respective authors:
	rhjdvsgsgks
	ExtremeXT
This commit is contained in:
ExtremeXT
2024-12-17 20:18:30 +06:00
committed by Rifat Azad
parent 9c6d2bd0e3
commit 72739facc8
4 changed files with 13 additions and 6 deletions
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4
kernel/core_hook.c
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@@ -634,7 +634,7 @@ static int ksu_task_prctl(int option, unsigned long arg2, unsigned long arg3,
return -ENOSYS;
}
// kernel 4.4 and 4.9
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI) || defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
static int ksu_key_permission(key_ref_t key_ref, const struct cred *cred,
unsigned perm)
{
@@ -667,7 +667,7 @@ static struct security_hook_list ksu_hooks[] = {
LSM_HOOK_INIT(task_prctl, ksu_task_prctl),
LSM_HOOK_INIT(inode_rename, ksu_inode_rename),
LSM_HOOK_INIT(task_fix_setuid, ksu_task_fix_setuid),
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI) || defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
LSM_HOOK_INIT(key_permission, ksu_key_permission)
#endif
};