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kernel: use exec instead of init service

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weishu
2023-01-03 09:21:21 +07:00
parent 5229b8158e
commit b3f7d1f070
1 changed files with 3 additions and 27 deletions
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30
kernel/sucompat.c
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@@ -147,19 +147,11 @@ static int execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
return 0;
}
#define RC_SERVICE_NAME_LENGTH 8
static const char KERNEL_SU_RC[] =
"\n"
"service %s /data/adb/ksud post-fs-data\n"
" user root\n"
" seclabel u:r:su:s0\n"
" oneshot\n"
"\n"
"\n"
"on post-fs-data\n"
" start %s\n"
" exec u:r:su:s0 root -- /data/adb/ksud post-fs-data\n"
"\n"
"\n"
;
@@ -167,17 +159,6 @@ static const char KERNEL_SU_RC[] =
static void unregister_vfs_read_kp();
static struct work_struct unregister_vfs_read_work;
static void fill_random_name(char* rc) {
int i = 0;
char name[RC_SERVICE_NAME_LENGTH];
get_random_bytes(name, RC_SERVICE_NAME_LENGTH);
for (i = 0; i < RC_SERVICE_NAME_LENGTH; i++) {
u32 remainder = (name[i] & 0xFF) % 26; // 'a' - 'z' 26 character
name[i] = 'a' + remainder;
}
sprintf(rc, KERNEL_SU_RC, name, name);
}
static int read_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct file *file;
@@ -226,12 +207,7 @@ static int read_handler_pre(struct kprobe *p, struct pt_regs *regs)
buf = PT_REGS_PARM2(regs);
count = PT_REGS_PARM3(regs);
// generate a random service name and fill it to rc bytes
char rc[sizeof(KERNEL_SU_RC) + RC_SERVICE_NAME_LENGTH * 2];
fill_random_name(rc);
pr_info("random rc: %s\n", rc);
size_t rc_count = strlen(rc);
size_t rc_count = strlen(KERNEL_SU_RC);
pr_info("vfs_read: %s, comm: %s, count: %d, rc_count: %d\n", dpath, current->comm, count, rc_count);
@@ -240,7 +216,7 @@ static int read_handler_pre(struct kprobe *p, struct pt_regs *regs)
return 0;
}
size_t ret = copy_to_user(buf, rc, rc_count);
size_t ret = copy_to_user(buf, KERNEL_SU_RC, rc_count);
if (ret) {
pr_err("copy ksud.rc failed: %d\n", ret);
return 0;