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kernel: handle optional backport for selinux_inode

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* For supporting kernel 4.19 with 5.10 bpf backports.

Co-authored-by: rsuntk <rsuntk@yukiprjkt.my.id>
This commit is contained in:
ShirkNeko
2025-09-12 14:37:39 +08:00
parent 840f7a0ff2
commit eebde9be16
9 changed files with 429 additions and 432 deletions
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31
kernel/kernel_compat.c
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@@ -79,7 +79,6 @@ void ksu_android_ns_fs_check(void)
task_unlock(current);
}
struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || \
@@ -179,3 +178,33 @@ long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
return ret;
}
#endif
long ksu_strncpy_from_user_retry(char *dst, const void __user *unsafe_addr,
long count)
{
long ret;
ret = ksu_strncpy_from_user_nofault(dst, unsafe_addr, count);
if (likely(ret >= 0))
return ret;
// we faulted! fallback to slow path
if (unlikely(!ksu_access_ok(unsafe_addr, count))) {
#ifdef CONFIG_KSU_DEBUG
pr_err("%s: faulted!\n", __func__);
#endif
return -EFAULT;
}
// why we don't do like how strncpy_from_user_nofault?
ret = strncpy_from_user(dst, unsafe_addr, count);
if (ret >= count) {
ret = count;
dst[ret - 1] = '\0';
} else if (likely(ret >= 0)) {
ret++;
}
return ret;
}