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lkm: guard avc_has_perm patches behind selinux_state readback #172

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Merged
diabl0w merged 1 commit into from
Oct 21, 2026
+16 −14
Merged

lkm: guard avc_has_perm patches behind selinux_state readback #172

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30 changes: 16 additions & 14 deletions lkm/dfroot.c
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Original file line number Diff line number Diff line change
Expand Up @@ -106,20 +106,22 @@ static int __nocfi __init dfroot_init(void)
// Some kernels ship CONFIG_SECURITY_SELINUX_DEVELOP=n, so the selinux_state
// write above is a no-op there — patch the SELinux checks themselves instead
// (both: most denials surface through the noaudit path first).
avc_fn = (void *)get_addr("avc_has_perm");
if (!avc_fn)
pr_err("dfroot: avc_has_perm not found, skipping\n");
else {
patch_fn_ret_zero(avc_fn);
pr_info("dfroot: avc_has_perm patched\n");
}

avc_noaudit_fn = (void *)get_addr("avc_has_perm_noaudit");
if (!avc_noaudit_fn)
pr_err("dfroot: avc_has_perm_noaudit not found, skipping\n");
else {
patch_fn_ret_zero(avc_noaudit_fn);
pr_info("dfroot: avc_has_perm_noaudit patched\n");
if (READ_ONCE(*selinux_state)) {
avc_fn = (void *)get_addr("avc_has_perm");
if (!avc_fn)
pr_err("dfroot: avc_has_perm not found, skipping\n");
else {
patch_fn_ret_zero(avc_fn);
pr_info("dfroot: avc_has_perm patched\n");
}

avc_noaudit_fn = (void *)get_addr("avc_has_perm_noaudit");
if (!avc_noaudit_fn)
pr_err("dfroot: avc_has_perm_noaudit not found, skipping\n");
else {
patch_fn_ret_zero(avc_noaudit_fn);
pr_info("dfroot: avc_has_perm_noaudit patched\n");
}
}

// Oppo/OnePlus
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