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[1.0] Drop Non-GKI Support (#1483)

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Co-authored-by: weishu <twsxtd@gmail.com>
This commit is contained in:
Ylarod 2024-06-01 14:50:46 +08:00 committed by GitHub
parent b766b98513
commit 898e9d4f8c
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GPG Key ID: B5690EEEBB952194
14 changed files with 11 additions and 581 deletions
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15
kernel/Makefile
View File

@ -29,14 +29,6 @@ $(warning "KSU_GIT_VERSION not defined! It is better to make KernelSU a git subm
ccflags-y += -DKSU_VERSION=16
endif
ifeq ($(shell grep -q " current_sid(void)" $(srctree)/security/selinux/include/objsec.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_CURRENT_SID
endif
ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/include/security.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
endif
ifndef KSU_EXPECTED_SIZE
KSU_EXPECTED_SIZE := 0x033b
endif
@ -56,13 +48,6 @@ $(info -- KernelSU Manager signature hash: $(KSU_EXPECTED_HASH))
ccflags-y += -DEXPECTED_SIZE=$(KSU_EXPECTED_SIZE)
ccflags-y += -DEXPECTED_HASH=\"$(KSU_EXPECTED_HASH)\"
ifeq ($(shell grep -q "int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
ccflags-y += -DKSU_UMOUNT
else
$(info -- Did you know you can backport path_umount to fs/namespace.c from 5.9?)
$(info -- Read: https://kernelsu.org/guide/how-to-integrate-for-non-gki.html#how-to-backport-path-umount)
endif
ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat
ccflags-y += -Wno-declaration-after-statement -Wno-unused-function

2
kernel/allowlist.c
View File

@ -7,9 +7,7 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
#include <linux/compiler_types.h>
#endif
#include "ksu.h"
#include "klog.h" // IWYU pragma: keep

20
kernel/arch.h
View File

@ -18,19 +18,11 @@
#define __PT_SP_REG sp
#define __PT_IP_REG pc
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#define PRCTL_SYMBOL "__arm64_sys_prctl"
#define SYS_READ_SYMBOL "__arm64_sys_read"
#define SYS_NEWFSTATAT_SYMBOL "__arm64_sys_newfstatat"
#define SYS_FACCESSAT_SYMBOL "__arm64_sys_faccessat"
#define SYS_EXECVE_SYMBOL "__arm64_sys_execve"
#else
#define PRCTL_SYMBOL "sys_prctl"
#define SYS_READ_SYMBOL "sys_read"
#define SYS_NEWFSTATAT_SYMBOL "sys_newfstatat"
#define SYS_FACCESSAT_SYMBOL "sys_faccessat"
#define SYS_EXECVE_SYMBOL "sys_execve"
#endif
#elif defined(__x86_64__)
@ -47,19 +39,11 @@
#define __PT_RC_REG ax
#define __PT_SP_REG sp
#define __PT_IP_REG ip
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#define PRCTL_SYMBOL "__x64_sys_prctl"
#define SYS_READ_SYMBOL "__x64_sys_read"
#define SYS_NEWFSTATAT_SYMBOL "__x64_sys_newfstatat"
#define SYS_FACCESSAT_SYMBOL "__x64_sys_faccessat"
#define SYS_EXECVE_SYMBOL "__x64_sys_execve"
#else
#define PRCTL_SYMBOL "sys_prctl"
#define SYS_READ_SYMBOL "sys_read"
#define SYS_NEWFSTATAT_SYMBOL "sys_newfstatat"
#define SYS_FACCESSAT_SYMBOL "sys_faccessat"
#define SYS_EXECVE_SYMBOL "sys_execve"
#endif
#else
#error "Unsupported arch"
@ -83,10 +67,6 @@
#define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG)
#define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#define PT_REAL_REGS(regs) ((struct pt_regs *)PT_REGS_PARM1(regs))
#else
#define PT_REAL_REGS(regs) ((regs))
#endif
#endif

53
kernel/core_hook.c
View File

@ -98,11 +98,7 @@ static void setup_groups(struct root_profile *profile, struct cred *cred)
put_group_info(group_info);
return;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
group_info->gid[i] = kgid;
#else
GROUP_AT(group_info, i) = kgid;
#endif
}
groups_sort(group_info);
@ -449,14 +445,12 @@ static bool should_umount(struct path *path)
return false;
}
static int ksu_umount_mnt(struct path *path, int flags)
static void ksu_umount_mnt(struct path *path, int flags)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0) || defined(KSU_UMOUNT)
return path_umount(path, flags);
#else
// TODO: umount for non GKI kernel
return -ENOSYS;
#endif
int err = path_umount(path, flags);
if (err) {
pr_info("umount %s failed: %d\n", path->dentry->d_iname, err);
}
}
static void try_umount(const char *mnt, bool check_mnt, int flags)
@ -477,10 +471,7 @@ static void try_umount(const char *mnt, bool check_mnt, int flags)
return;
}
err = ksu_umount_mnt(&path, flags);
if (err) {
pr_warn("umount %s failed: %d\n", mnt, err);
}
ksu_umount_mnt(&path, flags);
}
int ksu_handle_setuid(struct cred *new, const struct cred *old)
@ -557,14 +548,8 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
int option = (int)PT_REGS_PARM1(real_regs);
unsigned long arg2 = (unsigned long)PT_REGS_PARM2(real_regs);
unsigned long arg3 = (unsigned long)PT_REGS_PARM3(real_regs);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
// PRCTL_SYMBOL is the arch-specificed one, which receive raw pt_regs from syscall
unsigned long arg4 = (unsigned long)PT_REGS_SYSCALL_PARM4(real_regs);
#else
// PRCTL_SYMBOL is the common one, called by C convention in do_syscall_64
// https://elixir.bootlin.com/linux/v4.15.18/source/arch/x86/entry/common.c#L287
unsigned long arg4 = (unsigned long)PT_REGS_CCALL_PARM4(real_regs);
#endif
unsigned long arg5 = (unsigned long)PT_REGS_PARM5(real_regs);
return ksu_handle_prctl(option, arg2, arg3, arg4, arg5);
@ -624,23 +609,7 @@ static int ksu_task_prctl(int option, unsigned long arg2, unsigned long arg3,
ksu_handle_prctl(option, arg2, arg3, arg4, arg5);
return -ENOSYS;
}
// kernel 4.4 and 4.9
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI)
static int ksu_key_permission(key_ref_t key_ref, const struct cred *cred,
unsigned perm)
{
if (init_session_keyring != NULL) {
return 0;
}
if (strcmp(current->comm, "init")) {
// we are only interested in `init` process
return 0;
}
init_session_keyring = cred->session_keyring;
pr_info("kernel_compat: got init_session_keyring\n");
return 0;
}
#endif
static int ksu_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
struct inode *new_inode, struct dentry *new_dentry)
{
@ -658,19 +627,11 @@ 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)
LSM_HOOK_INIT(key_permission, ksu_key_permission)
#endif
};
void __init ksu_lsm_hook_init(void)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
security_add_hooks(ksu_hooks, ARRAY_SIZE(ksu_hooks), "ksu");
#else
// https://elixir.bootlin.com/linux/v4.10.17/source/include/linux/lsm_hooks.h#L1892
security_add_hooks(ksu_hooks, ARRAY_SIZE(ksu_hooks));
#endif
}
#else

90
kernel/kernel_compat.c
View File

@ -1,39 +1,10 @@
#include <linux/version.h>
#include <linux/fs.h>
#include <linux/nsproxy.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
#include <linux/sched/task.h>
#else
#include <linux/sched.h>
#endif
#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)
#include <linux/key.h>
#include <linux/errno.h>
#include <linux/cred.h>
struct key *init_session_keyring = NULL;
static inline int install_session_keyring(struct key *keyring)
{
struct cred *new;
int ret;
new = prepare_creds();
if (!new)
return -ENOMEM;
ret = install_session_keyring_to_cred(new, keyring);
if (ret < 0) {
abort_creds(new);
return ret;
}
return commit_creds(new);
}
#endif
#include "kernel_compat.h"
extern struct task_struct init_task;
@ -79,13 +50,6 @@ void ksu_android_ns_fs_check()
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 (init_session_keyring != NULL && !current_cred()->session_keyring &&
(current->flags & PF_WQ_WORKER)) {
pr_info("installing init session keyring for older kernel\n");
install_session_keyring(init_session_keyring);
}
#endif
// switch mnt_ns even if current is not wq_worker, to ensure what we open is the correct file in android mnt_ns, rather than user created mnt_ns
struct ksu_ns_fs_saved saved;
if (android_context_saved_enabled) {
@ -108,69 +72,17 @@ struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
loff_t *pos)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
return kernel_read(p, buf, count, pos);
#else
loff_t offset = pos ? *pos : 0;
ssize_t result = kernel_read(p, offset, (char *)buf, count);
if (pos && result > 0) {
*pos = offset + result;
}
return result;
#endif
}
ssize_t ksu_kernel_write_compat(struct file *p, const void *buf, size_t count,
loff_t *pos)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
return kernel_write(p, buf, count, pos);
#else
loff_t offset = pos ? *pos : 0;
ssize_t result = kernel_write(p, buf, count, offset);
if (pos && result > 0) {
*pos = offset + result;
}
return result;
#endif
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{
return strncpy_from_user_nofault(dst, unsafe_addr, count);
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 3, 0)
long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{
return strncpy_from_unsafe_user(dst, unsafe_addr, count);
}
#else
// Copied from: https://elixir.bootlin.com/linux/v4.9.337/source/mm/maccess.c#L201
long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{
mm_segment_t old_fs = get_fs();
long ret;
if (unlikely(count <= 0))
return 0;
set_fs(USER_DS);
pagefault_disable();
ret = strncpy_from_user(dst, unsafe_addr, count);
pagefault_enable();
set_fs(old_fs);
if (ret >= count) {
ret = count;
dst[ret - 1] = '\0';
} else if (ret > 0) {
ret++;
}
return ret;
}
#endif

4
kernel/kernel_compat.h
View File

@ -24,10 +24,6 @@ extern long ksu_strncpy_from_user_nofault(char *dst,
const void __user *unsafe_addr,
long count);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI)
extern struct key *init_session_keyring;
#endif
extern void ksu_android_ns_fs_check();
extern struct file *ksu_filp_open_compat(const char *filename, int flags,
umode_t mode);

3
kernel/ksu.c
View File

@ -94,7 +94,4 @@ module_exit(kernelsu_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("weishu");
MODULE_DESCRIPTION("Android KernelSU");
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
#endif

61
kernel/ksud.c
View File

@ -6,14 +6,7 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)
#include <linux/input-event-codes.h>
#else
#include <uapi/linux/input.h>
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)
#include <linux/aio.h>
#endif
#include <linux/kprobes.h>
#include <linux/printk.h>
#include <linux/types.h>
@ -470,27 +463,6 @@ bool ksu_is_safe_mode()
#ifdef CONFIG_KPROBES
// https://elixir.bootlin.com/linux/v5.10.158/source/fs/exec.c#L1864
static int execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
int *fd = (int *)&PT_REGS_PARM1(regs);
struct filename **filename_ptr =
(struct filename **)&PT_REGS_PARM2(regs);
struct user_arg_ptr argv;
#ifdef CONFIG_COMPAT
argv.is_compat = PT_REGS_PARM3(regs);
if (unlikely(argv.is_compat)) {
argv.ptr.compat = PT_REGS_CCALL_PARM4(regs);
} else {
argv.ptr.native = PT_REGS_CCALL_PARM4(regs);
}
#else
argv.ptr.native = PT_REGS_PARM3(regs);
#endif
return ksu_handle_execveat_ksud(fd, filename_ptr, &argv, NULL, NULL);
}
static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
@ -514,18 +486,6 @@ static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
NULL);
}
// remove this later!
__maybe_unused static int vfs_read_handler_pre(struct kprobe *p,
struct pt_regs *regs)
{
struct file **file_ptr = (struct file **)&PT_REGS_PARM1(regs);
char __user **buf_ptr = (char **)&PT_REGS_PARM2(regs);
size_t *count_ptr = (size_t *)&PT_REGS_PARM3(regs);
loff_t **pos_ptr = (loff_t **)&PT_REGS_CCALL_PARM4(regs);
return ksu_handle_vfs_read(file_ptr, buf_ptr, count_ptr, pos_ptr);
}
static int sys_read_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
@ -545,35 +505,16 @@ static int input_handle_event_handler_pre(struct kprobe *p,
return ksu_handle_input_handle_event(type, code, value);
}
#if 1
static struct kprobe execve_kp = {
.symbol_name = SYS_EXECVE_SYMBOL,
.pre_handler = sys_execve_handler_pre,
};
#else
static struct kprobe execve_kp = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
.symbol_name = "do_execveat_common",
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
.symbol_name = "__do_execve_file",
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
.symbol_name = "do_execveat_common",
#endif
.pre_handler = execve_handler_pre,
};
#endif
#if 1
static struct kprobe vfs_read_kp = {
.symbol_name = SYS_READ_SYMBOL,
.pre_handler = sys_read_handler_pre,
};
#else
static struct kprobe vfs_read_kp = {
.symbol_name = "vfs_read",
.pre_handler = vfs_read_handler_pre,
};
#endif
static struct kprobe input_event_kp = {
.symbol_name = "input_event",

15
kernel/selinux/rules.c
View File

@ -9,9 +9,7 @@
#include "linux/lsm_audit.h"
#include "xfrm.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
#define SELINUX_POLICY_INSTEAD_SELINUX_SS
#endif
#define KERNEL_SU_DOMAIN "su"
#define KERNEL_SU_FILE "ksu_file"
@ -21,18 +19,8 @@
static struct policydb *get_policydb(void)
{
struct policydb *db;
// selinux_state does not exists before 4.19
#ifdef KSU_COMPAT_USE_SELINUX_STATE
#ifdef SELINUX_POLICY_INSTEAD_SELINUX_SS
struct selinux_policy *policy = rcu_dereference(selinux_state.policy);
db = &policy->policydb;
#else
struct selinux_ss *ss = rcu_dereference(selinux_state.ss);
db = &ss->policydb;
#endif
#else
db = &policydb;
#endif
return db;
}
@ -181,8 +169,7 @@ static int get_object(char *buf, char __user *user_object, size_t buf_sz,
// reset avc cache table, otherwise the new rules will not take effect if already denied
static void reset_avc_cache()
{
#if ((!defined(KSU_COMPAT_USE_SELINUX_STATE)) || \
LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0))
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0))
avc_ss_reset(0);
selnl_notify_policyload(0);
selinux_status_update_policyload(0);

15
kernel/selinux/selinux.c
View File

@ -2,9 +2,6 @@
#include "objsec.h"
#include "linux/version.h"
#include "../klog.h" // IWYU pragma: keep
#ifndef KSU_COMPAT_USE_SELINUX_STATE
#include "avc.h"
#endif
#define KERNEL_SU_DOMAIN "u:r:su:s0"
@ -55,32 +52,20 @@ if (!is_domain_permissive) {
void setenforce(bool enforce)
{
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
#ifdef KSU_COMPAT_USE_SELINUX_STATE
selinux_state.enforcing = enforce;
#else
selinux_enforcing = enforce;
#endif
#endif
}
bool getenforce()
{
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
#ifdef KSU_COMPAT_USE_SELINUX_STATE
if (selinux_state.disabled) {
#else
if (selinux_disabled) {
#endif
return false;
}
#endif
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
#ifdef KSU_COMPAT_USE_SELINUX_STATE
return selinux_state.enforcing;
#else
return selinux_enforcing;
#endif
#else
return true;
#endif

4
kernel/selinux/selinux.h
View File

@ -4,10 +4,6 @@
#include "linux/types.h"
#include "linux/version.h"
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)) || defined(KSU_COMPAT_HAS_SELINUX_STATE)
#define KSU_COMPAT_USE_SELINUX_STATE
#endif
void setup_selinux(const char *);
void setenforce(bool);

217
kernel/selinux/sepolicy.c
View File

@ -524,7 +524,6 @@ static bool add_filename_trans(struct policydb *db, const char *s,
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0)
struct filename_trans_key key;
key.ttype = tgt->value;
key.tclass = cls->value;
@ -532,13 +531,8 @@ static bool add_filename_trans(struct policydb *db, const char *s,
struct filename_trans_datum *last = NULL;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
struct filename_trans_datum *trans =
policydb_filenametr_search(db, &key);
#else
struct filename_trans_datum *trans =
hashtab_search(&db->filename_trans, &key);
#endif
while (trans) {
if (ebitmap_get_bit(&trans->stypes, src->value - 1)) {
// Duplicate, overwrite existing data and return
@ -567,39 +561,6 @@ static bool add_filename_trans(struct policydb *db, const char *s,
db->compat_filename_trans_count++;
return ebitmap_set_bit(&trans->stypes, src->value - 1, 1) == 0;
#else // < 5.7.0, has no filename_trans_key, but struct filename_trans
struct filename_trans key;
key.ttype = tgt->value;
key.tclass = cls->value;
key.name = (char *)o;
struct filename_trans_datum *trans =
hashtab_search(db->filename_trans, &key);
if (trans == NULL) {
trans = (struct filename_trans_datum *)kcalloc(sizeof(*trans),
1, GFP_ATOMIC);
if (!trans) {
pr_err("add_filename_trans: Failed to alloc datum\n");
return false;
}
struct filename_trans *new_key =
(struct filename_trans *)kmalloc(sizeof(*new_key),
GFP_ATOMIC);
if (!new_key) {
pr_err("add_filename_trans: Failed to alloc new_key\n");
return false;
}
*new_key = key;
new_key->name = kstrdup(key.name, GFP_ATOMIC);
trans->otype = def->value;
hashtab_insert(db->filename_trans, new_key, trans);
}
return ebitmap_set_bit(&db->filename_trans_ttypes, src->value - 1, 1) ==
0;
#endif
}
static bool add_genfscon(struct policydb *db, const char *fs_name,
@ -626,7 +587,6 @@ static void *ksu_realloc(void *old, size_t new_size, size_t old_size)
static bool add_type(struct policydb *db, const char *type_name, bool attr)
{
#ifdef KSU_SUPPORT_ADD_TYPE
struct type_datum *type = symtab_search(&db->p_types, type_name);
if (type) {
pr_warn("Type %s already exists\n", type_name);
@ -656,7 +616,6 @@ static bool add_type(struct policydb *db, const char *type_name, bool attr)
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
struct ebitmap *new_type_attr_map_array =
ksu_realloc(db->type_attr_map_array,
value * sizeof(struct ebitmap),
@ -703,171 +662,6 @@ static bool add_type(struct policydb *db, const char *type_name, bool attr)
}
return true;
#elif defined(CONFIG_IS_HW_HISI)
/*
* Huawei use type_attr_map and type_val_to_struct.
* And use ebitmap not flex_array.
*/
size_t new_size = sizeof(struct ebitmap) * db->p_types.nprim;
struct ebitmap *new_type_attr_map =
(krealloc(db->type_attr_map, new_size, GFP_ATOMIC));
struct type_datum **new_type_val_to_struct =
krealloc(db->type_val_to_struct,
sizeof(*db->type_val_to_struct) * db->p_types.nprim,
GFP_ATOMIC);
if (!new_type_attr_map) {
pr_err("add_type: alloc type_attr_map failed\n");
return false;
}
if (!new_type_val_to_struct) {
pr_err("add_type: alloc type_val_to_struct failed\n");
return false;
}
char **new_val_to_name_types =
krealloc(db->sym_val_to_name[SYM_TYPES],
sizeof(char *) * db->symtab[SYM_TYPES].nprim,
GFP_KERNEL);
if (!new_val_to_name_types) {
pr_err("add_type: alloc val_to_name failed\n");
return false;
}
db->type_attr_map = new_type_attr_map;
ebitmap_init(&db->type_attr_map[value - 1], HISI_SELINUX_EBITMAP_RO);
ebitmap_set_bit(&db->type_attr_map[value - 1], value - 1, 1);
db->type_val_to_struct = new_type_val_to_struct;
db->type_val_to_struct[value - 1] = type;
db->sym_val_to_name[SYM_TYPES] = new_val_to_name_types;
db->sym_val_to_name[SYM_TYPES][value - 1] = key;
int i;
for (i = 0; i < db->p_roles.nprim; ++i) {
ebitmap_set_bit(&db->role_val_to_struct[i]->types, value - 1,
1);
}
return true;
#else
// flex_array is not extensible, we need to create a new bigger one instead
struct flex_array *new_type_attr_map_array =
flex_array_alloc(sizeof(struct ebitmap), db->p_types.nprim,
GFP_ATOMIC | __GFP_ZERO);
struct flex_array *new_type_val_to_struct =
flex_array_alloc(sizeof(struct type_datum *), db->p_types.nprim,
GFP_ATOMIC | __GFP_ZERO);
struct flex_array *new_val_to_name_types =
flex_array_alloc(sizeof(char *), db->symtab[SYM_TYPES].nprim,
GFP_ATOMIC | __GFP_ZERO);
if (!new_type_attr_map_array) {
pr_err("add_type: alloc type_attr_map_array failed\n");
return false;
}
if (!new_type_val_to_struct) {
pr_err("add_type: alloc type_val_to_struct failed\n");
return false;
}
if (!new_val_to_name_types) {
pr_err("add_type: alloc val_to_name failed\n");
return false;
}
// preallocate so we don't have to worry about the put ever failing
if (flex_array_prealloc(new_type_attr_map_array, 0, db->p_types.nprim,
GFP_ATOMIC | __GFP_ZERO)) {
pr_err("add_type: prealloc type_attr_map_array failed\n");
return false;
}
if (flex_array_prealloc(new_type_val_to_struct, 0, db->p_types.nprim,
GFP_ATOMIC | __GFP_ZERO)) {
pr_err("add_type: prealloc type_val_to_struct_array failed\n");
return false;
}
if (flex_array_prealloc(new_val_to_name_types, 0,
db->symtab[SYM_TYPES].nprim,
GFP_ATOMIC | __GFP_ZERO)) {
pr_err("add_type: prealloc val_to_name_types failed\n");
return false;
}
int j;
void *old_elem;
// copy the old data or pointers to new flex arrays
for (j = 0; j < db->type_attr_map_array->total_nr_elements; j++) {
old_elem = flex_array_get(db->type_attr_map_array, j);
if (old_elem)
flex_array_put(new_type_attr_map_array, j, old_elem,
GFP_ATOMIC | __GFP_ZERO);
}
for (j = 0; j < db->type_val_to_struct_array->total_nr_elements; j++) {
old_elem = flex_array_get_ptr(db->type_val_to_struct_array, j);
if (old_elem)
flex_array_put_ptr(new_type_val_to_struct, j, old_elem,
GFP_ATOMIC | __GFP_ZERO);
}
for (j = 0; j < db->symtab[SYM_TYPES].nprim; j++) {
old_elem =
flex_array_get_ptr(db->sym_val_to_name[SYM_TYPES], j);
if (old_elem)
flex_array_put_ptr(new_val_to_name_types, j, old_elem,
GFP_ATOMIC | __GFP_ZERO);
}
// store the pointer of old flex arrays first, when assigning new ones we
// should free it
struct flex_array *old_fa;
old_fa = db->type_attr_map_array;
db->type_attr_map_array = new_type_attr_map_array;
if (old_fa) {
flex_array_free(old_fa);
}
ebitmap_init(flex_array_get(db->type_attr_map_array, value - 1));
ebitmap_set_bit(flex_array_get(db->type_attr_map_array, value - 1),
value - 1, 1);
old_fa = db->type_val_to_struct_array;
db->type_val_to_struct_array = new_type_val_to_struct;
if (old_fa) {
flex_array_free(old_fa);
}
flex_array_put_ptr(db->type_val_to_struct_array, value - 1, type,
GFP_ATOMIC | __GFP_ZERO);
old_fa = db->sym_val_to_name[SYM_TYPES];
db->sym_val_to_name[SYM_TYPES] = new_val_to_name_types;
if (old_fa) {
flex_array_free(old_fa);
}
flex_array_put_ptr(db->sym_val_to_name[SYM_TYPES], value - 1, key,
GFP_ATOMIC | __GFP_ZERO);
int i;
for (i = 0; i < db->p_roles.nprim; ++i) {
ebitmap_set_bit(&db->role_val_to_struct[i]->types, value - 1,
1);
}
return true;
#endif
#else
return false;
#endif
}
static bool set_type_state(struct policydb *db, const char *type_name,
@ -902,18 +696,7 @@ static bool set_type_state(struct policydb *db, const char *type_name,
static void add_typeattribute_raw(struct policydb *db, struct type_datum *type,
struct type_datum *attr)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
struct ebitmap *sattr = &db->type_attr_map_array[type->value - 1];
#elif defined(CONFIG_IS_HW_HISI)
/*
* HISI_SELINUX_EBITMAP_RO is Huawei's unique features.
*/
struct ebitmap *sattr = &db->type_attr_map[type->value - 1],
HISI_SELINUX_EBITMAP_RO;
#else
struct ebitmap *sattr =
flex_array_get(db->type_attr_map_array, type->value - 1);
#endif
ebitmap_set_bit(sattr, attr->value - 1, 1);
struct hashtab_node *node;

89
kernel/sucompat.c
View File

@ -8,11 +8,7 @@
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
#include <linux/sched/task_stack.h>
#else
#include <linux/sched.h>
#endif
#include "objsec.h"
#include "allowlist.h"
@ -184,12 +180,7 @@ int ksu_handle_devpts(struct inode *inode)
return 0;
if (ksu_devpts_sid) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
struct inode_security_struct *sec = selinux_inode(inode);
#else
struct inode_security_struct *sec =
(struct inode_security_struct *)inode->i_security;
#endif
if (sec) {
sec->sid = ksu_devpts_sid;
}
@ -200,18 +191,6 @@ int ksu_handle_devpts(struct inode *inode)
#ifdef CONFIG_KPROBES
__maybe_unused static int faccessat_handler_pre(struct kprobe *p,
struct pt_regs *regs)
{
int *dfd = (int *)&PT_REGS_PARM1(regs);
const char __user **filename_user = (const char **)&PT_REGS_PARM2(regs);
int *mode = (int *)&PT_REGS_PARM3(regs);
// Both sys_ and do_ is C function
int *flags = (int *)&PT_REGS_CCALL_PARM4(regs);
return ksu_handle_faccessat(dfd, filename_user, mode, flags);
}
static int sys_faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
@ -223,43 +202,16 @@ static int sys_faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
return ksu_handle_faccessat(dfd, filename_user, mode, NULL);
}
__maybe_unused static int newfstatat_handler_pre(struct kprobe *p,
struct pt_regs *regs)
{
int *dfd = (int *)&PT_REGS_PARM1(regs);
const char __user **filename_user = (const char **)&PT_REGS_PARM2(regs);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
// static int vfs_statx(int dfd, const char __user *filename, int flags, struct kstat *stat, u32 request_mask)
int *flags = (int *)&PT_REGS_PARM3(regs);
#else
// int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,int flag)
int *flags = (int *)&PT_REGS_CCALL_PARM4(regs);
#endif
return ksu_handle_stat(dfd, filename_user, flags);
}
static int sys_newfstatat_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
int *dfd = (int *)&PT_REGS_PARM1(real_regs);
const char __user **filename_user =
(const char **)&PT_REGS_PARM2(real_regs);
const char __user **filename_user = (const char **)&PT_REGS_PARM2(real_regs);
int *flags = (int *)&PT_REGS_SYSCALL_PARM4(real_regs);
return ksu_handle_stat(dfd, filename_user, flags);
}
// https://elixir.bootlin.com/linux/v5.10.158/source/fs/exec.c#L1864
static int execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
int *fd = (int *)&PT_REGS_PARM1(regs);
struct filename **filename_ptr =
(struct filename **)&PT_REGS_PARM2(regs);
return ksu_handle_execveat_sucompat(fd, filename_ptr, NULL, NULL, NULL);
}
static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
@ -270,65 +222,26 @@ static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
NULL);
}
#if 1
static struct kprobe faccessat_kp = {
.symbol_name = SYS_FACCESSAT_SYMBOL,
.pre_handler = sys_faccessat_handler_pre,
};
#else
static struct kprobe faccessat_kp = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
.symbol_name = "do_faccessat",
#else
.symbol_name = "sys_faccessat",
#endif
.pre_handler = faccessat_handler_pre,
};
#endif
#if 1
static struct kprobe newfstatat_kp = {
.symbol_name = SYS_NEWFSTATAT_SYMBOL,
.pre_handler = sys_newfstatat_handler_pre,
};
#else
static struct kprobe newfstatat_kp = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
.symbol_name = "vfs_statx",
#else
.symbol_name = "vfs_fstatat",
#endif
.pre_handler = newfstatat_handler_pre,
};
#endif
#if 1
static struct kprobe execve_kp = {
.symbol_name = SYS_EXECVE_SYMBOL,
.pre_handler = sys_execve_handler_pre,
};
#else
static struct kprobe execve_kp = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
.symbol_name = "do_execveat_common",
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
.symbol_name = "__do_execve_file",
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
.symbol_name = "do_execveat_common",
#endif
.pre_handler = execve_handler_pre,
};
#endif
static int pts_unix98_lookup_pre(struct kprobe *p, struct pt_regs *regs)
{
struct inode *inode;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
struct file *file = (struct file *)PT_REGS_PARM2(regs);
inode = file->f_path.dentry->d_inode;
#else
inode = (struct inode *)PT_REGS_PARM2(regs);
#endif
return ksu_handle_devpts(inode);
}

4
kernel/throne_tracker.c
View File

@ -170,11 +170,7 @@ FILLDIR_RETURN_TYPE my_actor(struct dir_context *ctx, const char *name,
} else {
if ((namelen == 8) && (strncmp(name, "base.apk", namelen) == 0)) {
struct apk_path_hash *pos, *n;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
unsigned int hash = full_name_hash(dirpath, strlen(dirpath));
#else
unsigned int hash = full_name_hash(NULL, dirpath, strlen(dirpath));
#endif
list_for_each_entry(pos, &apk_path_hash_list, list) {
if (hash == pos->hash) {
pos->exists = true;