From d399d6b179f07b9904de0e76d06c77a3d0a66b51 Mon Sep 17 00:00:00 2001 From: Viktor Prutyanov Date: Thu, 23 Feb 2023 00:12:46 +0300 Subject: [PATCH] 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 Tested-by: Yuri Benditovich Reviewed-by: Annie Li Message-id: 20230222211246.883679-4-viktor@daynix.com Signed-off-by: Peter Maydell --- contrib/elf2dmp/main.c | 28 ++++++++++++++++++++++++++-- contrib/elf2dmp/pe.h | 15 +++++++++++++++ 2 files changed, 41 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; diff --git a/contrib/elf2dmp/pe.h b/contrib/elf2dmp/pe.h index 807d006364..71126af1ac 100644 --- a/contrib/elf2dmp/pe.h +++ b/contrib/elf2dmp/pe.h @@ -88,6 +88,20 @@ typedef struct IMAGE_NT_HEADERS64 { IMAGE_OPTIONAL_HEADER64 OptionalHeader; } __attribute__ ((packed)) IMAGE_NT_HEADERS64; +typedef struct IMAGE_EXPORT_DIRECTORY { + uint32_t Characteristics; + uint32_t TimeDateStamp; + uint16_t MajorVersion; + uint16_t MinorVersion; + uint32_t Name; + uint32_t Base; + uint32_t NumberOfFunctions; + uint32_t NumberOfNames; + uint32_t AddressOfFunctions; + uint32_t AddressOfNames; + uint32_t AddressOfNameOrdinals; +} __attribute__ ((packed)) IMAGE_EXPORT_DIRECTORY; + typedef struct IMAGE_DEBUG_DIRECTORY { uint32_t Characteristics; uint32_t TimeDateStamp; @@ -102,6 +116,7 @@ typedef struct IMAGE_DEBUG_DIRECTORY { #define IMAGE_DEBUG_TYPE_CODEVIEW 2 #endif +#define IMAGE_FILE_EXPORT_DIRECTORY 0 #define IMAGE_FILE_DEBUG_DIRECTORY 6 typedef struct guid_t {