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Fix C23: vnode_getattr string anchor resolved to wrong function (AppleImage4)

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Root cause: find_string("vnode_getattr") matched "%s: vnode_getattr: %d"
format string inside an AppleImage4 function. The old code then took that
function as vnode_getattr itself, causing BL to call into AppleImage4 with
wrong arguments → PAC failure on indirect branch at a2+48.

Fix: _find_vnode_getattr_via_string() now scans backward from the string
ref for a BL instruction and extracts its target — the real vnode_getattr
(sub_FFFFFE0007CCD1B4 at foff 0xCC91B4).

Bisection confirmed: variants A (stack frame) and B (+ tpidr_el1) boot OK,
variant C (+ BL vnode_getattr) panics with old resolution, boots OK with fix.

Boot-tested: full C23 patch with corrected vnode_getattr — BOOTS OK.
This commit is contained in:
Lakr
2026-03-04 21:21:23 +08:00
parent 916c9c2168
commit 894c2d1551
5 changed files with 437 additions and 12 deletions
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Makefile
+4 -1
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@@ -222,7 +222,7 @@ restore:
# Ramdisk
# ═══════════════════════════════════════════════════════════════════
.PHONY: ramdisk_build ramdisk_send testing_ramdisk_build testing_ramdisk_send testing_do testing_do_save testing_kernel_patch testing_do_patch
.PHONY: ramdisk_build ramdisk_send testing_ramdisk_build testing_ramdisk_send testing_do testing_do_save testing_kernel_patch testing_do_patch testing_c23_bisect
ramdisk_build:
cd $(VM_DIR) && $(PYTHON) "$(CURDIR)/$(SCRIPTS)/ramdisk_build.py" .
@@ -251,6 +251,9 @@ testing_do_patch:
testing_batch:
zsh "$(CURDIR)/$(SCRIPTS)/testing_batch.sh" $(PATCHES)
testing_c23_bisect:
cd $(VM_DIR) && $(PYTHON) "$(CURDIR)/$(SCRIPTS)/testing_c23_bisect.py" . $(VARIANT)
# ═══════════════════════════════════════════════════════════════════
# CFW
# ═══════════════════════════════════════════════════════════════════