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kernel: backport to 4.4 (#166)

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These changes make KernelSU work on kernel4.4
[link](https://github.com/F-19-F/android_kernel_oneplus_msm8998).
LINUX_VERSION_CODE macro changes have been vertied on 4.4 4.9 4.14.
For kernel 4.4,just pick two commits
* [introduce
KernelSU](2993524f2f)
* [allow init exec ksud under
nosuid](3df9df42a6)
This commit is contained in:
f19
2023-02-01 19:48:36 +08:00
committed by GitHub
parent 417ff8a6c5
commit 4f2b8b7077
10 changed files with 104 additions and 32 deletions
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24
kernel/allowlist.c
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@@ -4,9 +4,10 @@
#include "linux/list.h"
#include "linux/printk.h"
#include "linux/slab.h"
#include "linux/version.h"
#include "klog.h" // IWYU pragma: keep
#include "selinux/selinux.h"
#include "kernel_compat.h"
#define FILE_MAGIC 0x7f4b5355 // ' KSU', u32
#define FILE_FORMAT_VERSION 1 // u32
@@ -21,7 +22,12 @@ struct perm_data {
static struct list_head allow_list;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
#define KERNEL_SU_ALLOWLIST "/data/adb/ksu/.allowlist"
#else
// filp_open return error if under encryption dir on Kernel4.4
#define KERNEL_SU_ALLOWLIST "/data/user_de/.ksu_allowlist"
#endif
static struct work_struct ksu_save_work;
static struct work_struct ksu_load_work;
@@ -128,12 +134,12 @@ void do_persistent_allow_list(struct work_struct *work)
}
// store magic and version
if (kernel_write(fp, &magic, sizeof(magic), &off) != sizeof(magic)) {
if (kernel_write_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic)) {
pr_err("save_allow_list write magic failed.\n");
goto exit;
}
if (kernel_write(fp, &version, sizeof(version), &off) !=
if (kernel_write_compat(fp, &version, sizeof(version), &off) !=
sizeof(version)) {
pr_err("save_allow_list write version failed.\n");
goto exit;
@@ -143,8 +149,8 @@ void do_persistent_allow_list(struct work_struct *work)
p = list_entry(pos, struct perm_data, list);
pr_info("save allow list uid :%d, allow: %d\n", p->uid,
p->allow);
kernel_write(fp, &p->uid, sizeof(p->uid), &off);
kernel_write(fp, &p->allow, sizeof(p->allow), &off);
kernel_write_compat(fp, &p->uid, sizeof(p->uid), &off);
kernel_write_compat(fp, &p->allow, sizeof(p->allow), &off);
}
exit:
@@ -194,13 +200,13 @@ void do_load_allow_list(struct work_struct *work)
}
// verify magic
if (kernel_read(fp, &magic, sizeof(magic), &off) != sizeof(magic) ||
if (kernel_read_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic) ||
magic != FILE_MAGIC) {
pr_err("allowlist file invalid: %d!\n", magic);
goto exit;
}
if (kernel_read(fp, &version, sizeof(version), &off) !=
if (kernel_read_compat(fp, &version, sizeof(version), &off) !=
sizeof(version)) {
pr_err("allowlist read version: %d failed\n", version);
goto exit;
@@ -211,12 +217,12 @@ void do_load_allow_list(struct work_struct *work)
while (true) {
u32 uid;
bool allow = false;
ret = kernel_read(fp, &uid, sizeof(uid), &off);
ret = kernel_read_compat(fp, &uid, sizeof(uid), &off);
if (ret <= 0) {
pr_info("load_allow_list read err: %d\n", ret);
break;
}
ret = kernel_read(fp, &allow, sizeof(allow), &off);
ret = kernel_read_compat(fp, &allow, sizeof(allow), &off);
pr_info("load_allow_uid: %d, allow: %d\n", uid, allow);