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

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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>
This commit is contained in:
Viktor Prutyanov 2023-02-23 00:12:46 +03:00 committed by Peter Maydell
parent 06ac60b73e
commit d399d6b179
2 changed files with 41 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
contrib/elf2dmp/main.c
View File

@ -17,6 +17,7 @@
#define SYM_URL_BASE "https://msdl.microsoft.com/download/symbols/" #define SYM_URL_BASE "https://msdl.microsoft.com/download/symbols/"
#define PDB_NAME "ntkrnlmp.pdb" #define PDB_NAME "ntkrnlmp.pdb"
#define PE_NAME "ntoskrnl.exe"
#define INITIAL_MXCSR 0x1f80 #define INITIAL_MXCSR 0x1f80
@ -405,6 +406,25 @@ static int write_dump(struct pa_space *ps,
return fclose(dmp_file); 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, static int pe_get_pdb_symstore_hash(uint64_t base, void *start_addr,
char *hash, struct va_space *vs) char *hash, struct va_space *vs)
{ {
@ -489,6 +509,7 @@ int main(int argc, char *argv[])
uint64_t KdDebuggerDataBlock; uint64_t KdDebuggerDataBlock;
KDDEBUGGER_DATA64 *kdbg; KDDEBUGGER_DATA64 *kdbg;
uint64_t KdVersionBlock; uint64_t KdVersionBlock;
bool kernel_found = false;
if (argc != 3) { if (argc != 3) {
eprintf("usage:\n\t%s elf_file dmp_file\n", argv[0]); 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 */ 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"); eprintf("Failed to find NT kernel image\n");
err = 1; err = 1;
goto out_ps; goto out_ps;

15
contrib/elf2dmp/pe.h
View File

@ -88,6 +88,20 @@ typedef struct IMAGE_NT_HEADERS64 {
IMAGE_OPTIONAL_HEADER64 OptionalHeader; IMAGE_OPTIONAL_HEADER64 OptionalHeader;
} __attribute__ ((packed)) IMAGE_NT_HEADERS64; } __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 { typedef struct IMAGE_DEBUG_DIRECTORY {
uint32_t Characteristics; uint32_t Characteristics;
uint32_t TimeDateStamp; uint32_t TimeDateStamp;
@ -102,6 +116,7 @@ typedef struct IMAGE_DEBUG_DIRECTORY {
#define IMAGE_DEBUG_TYPE_CODEVIEW 2 #define IMAGE_DEBUG_TYPE_CODEVIEW 2
#endif #endif
#define IMAGE_FILE_EXPORT_DIRECTORY 0
#define IMAGE_FILE_DEBUG_DIRECTORY 6 #define IMAGE_FILE_DEBUG_DIRECTORY 6
typedef struct guid_t { typedef struct guid_t {