fix: bypass Samsung DEFEX by loading libzygisk.so via remote memfd - #380
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ducthoe wants to merge 1 commit into
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fix: bypass Samsung DEFEX by loading libzygisk.so via remote memfd#380ducthoe wants to merge 1 commit into
ducthoe wants to merge 1 commit into
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Samsung DEFEX blocks app_process64 from open()ing /data/adb/modules paths, so the remote openat of libzygisk.so inside the zygote fails with -1 and injection aborts. Instead of openat on the module path, create an anonymous memfd inside the target with memfd_create and fill it from the tracer (root) via /proc/<pid>/fd/<n>. Anonymous memory has no filesystem path, so path-based kernel checks (DEFEX, other LSMs) cannot block it. Works identically on devices without such restrictions. Also add late-load.sh bootstrap for KernelSU late-load mode: it only starts the ptrace monitor when missing; the user is expected to trigger a soft reboot (ksud soft-reboot) themselves.
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ducthoe
marked this pull request as draft
August 6, 2026 14:46
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Samsung DEFEX blocks app_process64 from open()ing
/data/adb/modules paths, so the remote openat of libzygisk.so inside the zygote fails with -1 and injection aborts.
Instead of openat on the module path, create an anonymous memfd inside the target with memfd_create and fill it from the tracer (root) via /proc//fd/. Anonymous memory has no filesystem path, so path-based kernel checks (DEFEX, other LSMs) cannot block it. Works identically on devices without such restrictions.
Also add late-load.sh bootstrap for KernelSU late-load mode: it only starts the ptrace monitor when missing; the user is expected to trigger a soft reboot (ksud soft-reboot) themselves.