contrib/elf2dmp: add PE name check and Windows Server 2022 support

Since its inception elf2dmp has checked MZ signatures within an
address space above IDT[0] interrupt vector and took first PE image
found as Windows Kernel.
But in Windows Server 2022 memory dump this address space range is
full of invalid PE fragments and the tool must check that PE image
is 'ntoskrnl.exe' actually.
So, introduce additional validation by checking image name from
Export Directory against 'ntoskrnl.exe'.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Tested-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Reviewed-by: Annie Li <annie.li@oracle.com>
Message-id: 20230222211246.883679-4-viktor@daynix.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 26 insertions, 2 deletions

diff --git a/contrib/elf2dmp/main.c b/contrib/elf2dmp/main.c
index 2f6028d8eb..89f0c69ab0 100644
--- a/contrib/elf2dmp/main.c
+++ b/contrib/elf2dmp/main.c
@@ -17,6 +17,7 @@
 
 #define SYM_URL_BASE    "https://msdl.microsoft.com/download/symbols/"
 #define PDB_NAME    "ntkrnlmp.pdb"
+#define PE_NAME     "ntoskrnl.exe"
 
 #define INITIAL_MXCSR   0x1f80
 
@@ -405,6 +406,25 @@ static int write_dump(struct pa_space *ps,
     return fclose(dmp_file);
 }
 
+static bool pe_check_export_name(uint64_t base, void *start_addr,
+        struct va_space *vs)
+{
+    IMAGE_EXPORT_DIRECTORY export_dir;
+    const char *pe_name;
+
+    if (pe_get_data_dir_entry(base, start_addr, IMAGE_FILE_EXPORT_DIRECTORY,
+                &export_dir, sizeof(export_dir), vs)) {
+        return false;
+    }
+
+    pe_name = va_space_resolve(vs, base + export_dir.Name);
+    if (!pe_name) {
+        return false;
+    }
+
+    return !strcmp(pe_name, PE_NAME);
+}
+
 static int pe_get_pdb_symstore_hash(uint64_t base, void *start_addr,
         char *hash, struct va_space *vs)
 {
@@ -489,6 +509,7 @@ int main(int argc, char *argv[])
     uint64_t KdDebuggerDataBlock;
     KDDEBUGGER_DATA64 *kdbg;
     uint64_t KdVersionBlock;
+    bool kernel_found = false;
 
     if (argc != 3) {
         eprintf("usage:\n\t%s elf_file dmp_file\n", argv[0]);
@@ -536,11 +557,14 @@ int main(int argc, char *argv[])
         }
 
         if (*(uint16_t *)nt_start_addr == 0x5a4d) { /* MZ */
-            break;
+            if (pe_check_export_name(KernBase, nt_start_addr, &vs)) {
+                kernel_found = true;
+                break;
+            }
         }
     }
 
-    if (!nt_start_addr) {
+    if (!kernel_found) {
         eprintf("Failed to find NT kernel image\n");
         err = 1;
         goto out_ps;