ohhhhhhhhhhh (exclude linux-extra-rootfs.img build artifact)

2026-10-01 23:13:42 +08:00
parent 737a2cb0db
commit 1074962546
533 changed files with 133239 additions and 5460 deletions
@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+# Full ELF health scan of the extra-rootfs /usr/lib (read-only loop mount).
+# Detects: non-ELF files, smashed headers (e_entry=0), truncated files
+# (any PT_LOAD p_offset+p_filesz > file size -> ld.so SIGBUS on mmap tail).
+set -uo pipefail
+IMG="${1:?usage: tmp_elf_scan.sh IMG}"
+L=$(losetup --find --show --partscan "$IMG" 2>/dev/null) || { echo LOSETUP_FAIL; exit 1; }
+sleep 0.3
+M=$(mktemp -d)
+mount -o ro "${L}p1" "$M" || { echo ESP_MOUNT_FAIL; exit 1; }
+R=$(mktemp -d)
+mount -o loop,ro "$M/boot/linux-extra-rootfs.img" "$R" || { echo EXTRA_MOUNT_FAIL; exit 1; }
+
+python3 - "$R" <<'PY'
+import os, struct, sys
+root = sys.argv[1]
+dirs = [os.path.join(root, "usr", "lib"), os.path.join(root, "lib")]
+bad = {}
+checked = 0
+for d in dirs:
+    if not os.path.isdir(d):
+        continue
+    for name in sorted(os.listdir(d)):
+        p = os.path.join(d, name)
+        if os.path.islink(p) or not os.path.isfile(p):
+            continue
+        if not (name.endswith(".so") or ".so." in name):
+            continue
+        checked += 1
+        try:
+            sz = os.path.getsize(p)
+            with open(p, "rb") as f:
+                hdr = f.read(64)
+            if len(hdr) < 64 or hdr[:4] != b"\x7fELF":
+                bad[p] = "NOT-ELF(%d)" % sz
+                continue
+            if hdr[4] != 2 or hdr[5] != 1:  # 64-bit LE
+                bad[p] = "BAD-CLASS"
+                continue
+            # Explicit offsets: e_type@16 e_entry@24 e_phoff@32
+            # e_phentsize@54 e_phnum@56 (ELF64 little-endian)
+            e_type = struct.unpack_from("<H", hdr, 16)[0]
+            e_entry = struct.unpack_from("<Q", hdr, 24)[0]
+            e_phoff = struct.unpack_from("<Q", hdr, 32)[0]
+            e_phentsize = struct.unpack_from("<H", hdr, 54)[0]
+            e_phnum = struct.unpack_from("<H", hdr, 56)[0]
+            if e_type not in (2, 3):  # ET_EXEC / ET_DYN
+                bad[p] = "BAD-TYPE(%d)" % e_type
+                continue
+            if e_entry == 0 and e_type == 3:  # ET_DYN with null entry
+                bad[p] = "ENTRY0"
+            if e_phentsize < 56 or e_phnum == 0 or e_phnum > 128:
+                bad[p] = "PHDR-GARBAGE(phentsize=%d phnum=%d)" % (e_phentsize, e_phnum)
+                continue
+            end = 0
+            with open(p, "rb") as f:
+                f.seek(e_phoff)
+                ph = f.read(e_phentsize * e_phnum)
+            if len(ph) < e_phentsize * e_phnum:
+                bad[p] = "TRUNCATED(phdr table file=%d)" % sz
+                continue
+            for i in range(e_phnum):
+                off = i * e_phentsize
+                p_type, p_flags = struct.unpack_from("<II", ph, off)
+                p_offset = struct.unpack_from("<Q", ph, off + 8)[0]
+                # ELF64 Phdr: p_offset@8 p_vaddr@16 p_paddr@24
+                # p_filesz@32 p_memsz@40 p_align@48
+                p_filesz = struct.unpack_from("<Q", ph, off + 32)[0]
+                if p_type == 1:  # PT_LOAD
+                    end = max(end, p_offset + p_filesz)
+            if end > sz:
+                bad.setdefault(p, "TRUNCATED(phdr=%d file=%d short=%d)" % (end, sz, end - sz))
+        except OSError as e:
+            bad[p] = "IOERR:%s" % e
+print("checked=%d bad=%d" % (checked, len(bad)))
+for p, why in sorted(bad.items()):
+    print("BAD %-12s %s" % (why, os.path.basename(p)))
+PY
+
+umount "$R"; rmdir "$R"
+umount "$M"; rmdir "$M"
+losetup -d "$L"