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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 a5ca4f861c
commit 5f2c1eef9c
4 changed files with 13 additions and 5 deletions
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4
kernel/kernel_compat.c
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@@ -9,7 +9,7 @@
#include <linux/uaccess.h>
#include "klog.h" // IWYU pragma: keep
#include "kernel_compat.h" // Add check Huawei Device
#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)
#include <linux/key.h>
#include <linux/errno.h>
#include <linux/cred.h>
@@ -84,7 +84,7 @@ int ksu_access_ok(const void *addr, unsigned long size) {
struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
{
#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)
if (init_session_keyring != NULL && !current_cred()->session_keyring &&
(current->flags & PF_WQ_WORKER)) {
pr_info("installing init session keyring for older kernel\n");