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docs: Add devpts description for non gki

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weishu
2024-05-09 11:47:34 +08:00
parent a943528d82
commit 109442f8c4
3 changed files with 101 additions and 32 deletions
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55
kernel/sucompat.c
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@@ -168,6 +168,37 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
return 0;
}
int ksu_handle_devpts(struct inode *inode)
{
if (!current->mm) {
return 0;
}
uid_t uid = current_uid().val;
if (uid % 100000 < 10000) {
// not untrusted_app, ignore it
return 0;
}
if (!ksu_is_allow_uid(uid))
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;
inode->i_uid.val = 0;
inode->i_gid.val = 0;
}
}
return 0;
}
#ifdef CONFIG_KPROBES
__maybe_unused static int faccessat_handler_pre(struct kprobe *p,
@@ -292,19 +323,6 @@ static struct kprobe execve_kp = {
static int devpts_get_priv_pre(struct kprobe *p, struct pt_regs *regs)
{
if (!current->mm) {
return 0;
}
uid_t uid = current_uid().val;
if (uid % 100000 < 10000) {
// not untrusted_app, ignore it
return 0;
}
if (!ksu_is_allow_uid(uid))
return 0;
struct inode *inode;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
struct dentry *dentry = (struct dentry *)PT_REGS_PARM1(regs);
@@ -313,16 +331,7 @@ static int devpts_get_priv_pre(struct kprobe *p, struct pt_regs *regs)
inode = (struct inode *)PT_REGS_PARM1(real_regs);
#endif
if (ksu_devpts_sid) {
struct inode_security_struct *sec = selinux_inode(inode);
if (sec) {
sec->sid = ksu_devpts_sid;
inode->i_uid.val = 0;
inode->i_gid.val = 0;
}
}
return 0;
return ksu_handle_devpts(inode);
}
static struct kprobe devpts_get_priv_kp = { .symbol_name = "devpts_get_priv",