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/* |
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* Copyright (C) 2007-2009 Sourcefire, Inc. |
| 2023340a |
*
* Authors: Tomasz Kojm |
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*
* This program is free software; you can redistribute it and/or modify |
| bb34cb31 |
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. |
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*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA. |
| 6ed894e0 |
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stat.h> |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#include <time.h>
#include "cltypes.h"
#include "elf.h"
#include "clamav.h" |
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#include "execs.h" |
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#include "matcher.h" |
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|
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#define EC16(v, conv) (conv ? cbswap16(v) : v)
#define EC32(v, conv) (conv ? cbswap32(v) : v) |
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|
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static uint32_t cli_rawaddr(uint32_t vaddr, struct elf_program_hdr32 *ph, uint16_t phnum, uint8_t conv, uint8_t *err)
{
uint16_t i, found = 0;
for(i = 0; i < phnum; i++) {
if(EC32(ph[i].p_vaddr, conv) <= vaddr && EC32(ph[i].p_vaddr, conv) + EC32(ph[i].p_memsz, conv) > vaddr) {
found = 1;
break;
}
}
if(!found) {
*err = 1;
return 0;
}
*err = 0;
return vaddr - EC32(ph[i].p_vaddr, conv) + EC32(ph[i].p_offset, conv);
}
|
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int cli_scanelf(cli_ctx *ctx) |
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{
struct elf_file_hdr32 file_hdr; |
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struct elf_section_hdr32 *section_hdr = NULL;
struct elf_program_hdr32 *program_hdr = NULL; |
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uint16_t shnum, phnum, shentsize, phentsize;
uint32_t entry, fentry, shoff, phoff, i;
uint8_t conv = 0, err; |
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unsigned int format; |
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fmap_t *map = *ctx->fmap; |
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|
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|
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cli_dbgmsg("in cli_scanelf\n"); |
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|
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if(fmap_readn(map, &file_hdr, 0, sizeof(file_hdr)) != sizeof(file_hdr)) { |
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/* Not an ELF file? */
cli_dbgmsg("ELF: Can't read file header\n");
return CL_CLEAN;
}
if(memcmp(file_hdr.e_ident, "\x7f\x45\x4c\x46", 4)) {
cli_dbgmsg("ELF: Not an ELF file\n");
return CL_CLEAN;
}
|
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format = file_hdr.e_ident[4];
if(format != 1 && format != 2) {
cli_dbgmsg("ELF: Unknown ELF class (%u)\n", file_hdr.e_ident[4]);
return CL_EFORMAT;
}
if(format == 2) {
struct elf_file_hdr64 file_hdr64; |
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if(fmap_readn(map, &file_hdr64, 0, sizeof(file_hdr64)) != sizeof(file_hdr64)) { |
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/* Not an ELF file? */
cli_dbgmsg("ELF: Can't read file header\n");
return CL_CLEAN;
}
/* it's enough for us to handle ELF64 as 32 */
file_hdr.e_entry = file_hdr64.e_entry;
file_hdr.e_phoff = file_hdr64.e_phoff;
file_hdr.e_shoff = file_hdr64.e_shoff;
file_hdr.e_flags = file_hdr64.e_flags;
file_hdr.e_ehsize = file_hdr64.e_ehsize;
file_hdr.e_phentsize = file_hdr64.e_phentsize;
if(file_hdr.e_phentsize == sizeof(struct elf_program_hdr64))
file_hdr.e_phentsize = sizeof(struct elf_program_hdr32);
file_hdr.e_phnum = file_hdr64.e_phnum;
file_hdr.e_shentsize = file_hdr64.e_shentsize;
if(file_hdr.e_shentsize == sizeof(struct elf_section_hdr64))
file_hdr.e_shentsize = sizeof(struct elf_section_hdr32);
file_hdr.e_shnum = file_hdr64.e_shnum;
file_hdr.e_shstrndx = file_hdr64.e_shstrndx; |
| 961db639 |
}
if(file_hdr.e_ident[5] == 1) {
#if WORDS_BIGENDIAN == 0
cli_dbgmsg("ELF: File is little-endian - conversion not required\n");
#else
cli_dbgmsg("ELF: File is little-endian - data conversion enabled\n"); |
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conv = 1; |
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#endif
} else {
#if WORDS_BIGENDIAN == 0
cli_dbgmsg("ELF: File is big-endian - data conversion enabled\n"); |
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conv = 1; |
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#else
cli_dbgmsg("ELF: File is big-endian - conversion not required\n");
#endif
}
|
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switch(EC16(file_hdr.e_type, conv)) { |
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case 0x0: /* ET_NONE */
cli_dbgmsg("ELF: File type: None\n");
break;
case 0x1: /* ET_REL */
cli_dbgmsg("ELF: File type: Relocatable\n");
break;
case 0x2: /* ET_EXEC */
cli_dbgmsg("ELF: File type: Executable\n");
break;
case 0x3: /* ET_DYN */
cli_dbgmsg("ELF: File type: Core\n");
break;
case 0x4: /* ET_CORE */
cli_dbgmsg("ELF: File type: Core\n");
break;
default: |
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cli_dbgmsg("ELF: File type: Unknown (%d)\n", EC16(file_hdr.e_type, conv)); |
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}
|
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switch(EC16(file_hdr.e_machine, conv)) { |
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/* Due to a huge list, we only include the most popular machines here */ |
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case 0: /* EM_NONE */ |
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cli_dbgmsg("ELF: Machine type: None\n");
break; |
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case 2: /* EM_SPARC */ |
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cli_dbgmsg("ELF: Machine type: SPARC\n");
break; |
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case 3: /* EM_386 */ |
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cli_dbgmsg("ELF: Machine type: Intel 80386\n");
break; |
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case 4: /* EM_68K */ |
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cli_dbgmsg("ELF: Machine type: Motorola 68000\n");
break; |
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case 8: /* EM_MIPS */ |
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cli_dbgmsg("ELF: Machine type: MIPS RS3000\n");
break; |
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case 9: /* EM_S370 */
cli_dbgmsg("ELF: Machine type: IBM System/370\n");
break;
case 15: /* EM_PARISC */ |
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cli_dbgmsg("ELF: Machine type: HPPA\n");
break; |
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case 20: /* EM_PPC */ |
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cli_dbgmsg("ELF: Machine type: PowerPC\n");
break; |
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case 21: /* EM_PPC64 */ |
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cli_dbgmsg("ELF: Machine type: PowerPC 64-bit\n");
break; |
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case 22: /* EM_S390 */ |
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cli_dbgmsg("ELF: Machine type: IBM S390\n");
break; |
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case 40: /* EM_ARM */ |
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cli_dbgmsg("ELF: Machine type: ARM\n");
break; |
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case 41: /* EM_FAKE_ALPHA */ |
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cli_dbgmsg("ELF: Machine type: Digital Alpha\n");
break; |
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case 43: /* EM_SPARCV9 */ |
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cli_dbgmsg("ELF: Machine type: SPARC v9 64-bit\n");
break; |
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case 50: /* EM_IA_64 */ |
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cli_dbgmsg("ELF: Machine type: IA64\n");
break; |
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case 62: /* EM_X86_64 */
cli_dbgmsg("ELF: Machine type: AMD x86-64\n");
break; |
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default: |
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cli_dbgmsg("ELF: Machine type: Unknown (0x%x)\n", EC16(file_hdr.e_machine, conv)); |
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}
|
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entry = EC32(file_hdr.e_entry, conv); |
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/* Program headers */
phnum = EC16(file_hdr.e_phnum, conv);
cli_dbgmsg("ELF: Number of program headers: %d\n", phnum);
if(phnum > 128) {
cli_dbgmsg("ELF: Suspicious number of program headers\n");
if(DETECT_BROKEN) {
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 939b015c |
}
return CL_EFORMAT;
}
if(phnum && entry) {
phentsize = EC16(file_hdr.e_phentsize, conv);
if(phentsize != sizeof(struct elf_program_hdr32)) {
cli_dbgmsg("ELF: phentsize != sizeof(struct elf_program_hdr32)\n");
if(DETECT_BROKEN) {
if(ctx->virname) |
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*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 939b015c |
}
return CL_EFORMAT;
}
phoff = EC32(file_hdr.e_phoff, conv);
cli_dbgmsg("ELF: Program header table offset: %d\n", phoff);
|
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if(phnum) {
program_hdr = (struct elf_program_hdr32 *) cli_calloc(phnum, phentsize);
if(!program_hdr) {
cli_errmsg("ELF: Can't allocate memory for program headers\n");
return CL_EMEM;
}
cli_dbgmsg("------------------------------------\n"); |
| 939b015c |
}
for(i = 0; i < phnum; i++) { |
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err = 0;
if(format == 1) { |
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if(fmap_readn(map, &program_hdr[i], phoff, sizeof(struct elf_program_hdr32)) != sizeof(struct elf_program_hdr32)) |
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err = 1; |
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phoff += sizeof(struct elf_program_hdr32); |
| a140a928 |
} else {
struct elf_program_hdr64 program_hdr64;
|
| 90b75c27 |
if(fmap_readn(map, &program_hdr64, phoff, sizeof(program_hdr64)) != sizeof(program_hdr64)) { |
| a140a928 |
err = 1;
} else {
program_hdr[i].p_type = program_hdr64.p_type;
program_hdr[i].p_offset = program_hdr64.p_offset;
program_hdr[i].p_vaddr = program_hdr64.p_vaddr;
program_hdr[i].p_paddr = program_hdr64.p_paddr;
program_hdr[i].p_filesz = program_hdr64.p_filesz;
program_hdr[i].p_memsz = program_hdr64.p_memsz;
program_hdr[i].p_flags = program_hdr64.p_flags;
program_hdr[i].p_align = program_hdr64.p_align;
} |
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phoff += sizeof(program_hdr64); |
| a140a928 |
} |
| 939b015c |
|
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if(err) { |
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cli_dbgmsg("ELF: Can't read segment #%d\n", i);
cli_dbgmsg("ELF: Possibly broken ELF file\n");
free(program_hdr);
if(DETECT_BROKEN) {
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 939b015c |
}
return CL_CLEAN;
}
cli_dbgmsg("ELF: Segment #%d\n", i);
cli_dbgmsg("ELF: Segment type: 0x%x\n", EC32(program_hdr[i].p_type, conv));
cli_dbgmsg("ELF: Segment offset: 0x%x\n", EC32(program_hdr[i].p_offset, conv));
cli_dbgmsg("ELF: Segment virtual address: 0x%x\n", EC32(program_hdr[i].p_vaddr, conv));
cli_dbgmsg("ELF: Segment real size: 0x%x\n", EC32(program_hdr[i].p_filesz, conv));
cli_dbgmsg("ELF: Segment virtual size: 0x%x\n", EC32(program_hdr[i].p_memsz, conv));
cli_dbgmsg("------------------------------------\n");
}
fentry = cli_rawaddr(entry, program_hdr, phnum, conv, &err);
free(program_hdr);
if(err) {
cli_dbgmsg("ELF: Can't calculate file offset of entry point\n");
if(DETECT_BROKEN) {
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 939b015c |
}
return CL_EFORMAT;
}
cli_dbgmsg("ELF: Entry point address: 0x%.8x\n", entry);
cli_dbgmsg("ELF: Entry point offset: 0x%.8x (%d)\n", fentry, fentry);
}
/* Sections */ |
| 6ed894e0 |
|
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shnum = EC16(file_hdr.e_shnum, conv); |
| 6ed894e0 |
cli_dbgmsg("ELF: Number of sections: %d\n", shnum);
if(shnum > 256) {
cli_dbgmsg("ELF: Suspicious number of sections\n");
if(DETECT_BROKEN) { |
| 3c91998b |
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 6ed894e0 |
}
return CL_EFORMAT;
}
|
| 3071071e |
shentsize = EC16(file_hdr.e_shentsize, conv); |
| 6ed894e0 |
if(shentsize != sizeof(struct elf_section_hdr32)) { |
| 01302683 |
cli_dbgmsg("ELF: shentsize != sizeof(struct elf_section_hdr32)\n"); |
| 6ed894e0 |
if(DETECT_BROKEN) { |
| 3c91998b |
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 6ed894e0 |
}
return CL_EFORMAT;
}
|
| 3071071e |
shoff = EC32(file_hdr.e_shoff, conv); |
| 6ed894e0 |
cli_dbgmsg("ELF: Section header table offset: %d\n", shoff);
|
| 87374bc0 |
if(shnum) {
section_hdr = (struct elf_section_hdr32 *) cli_calloc(shnum, shentsize);
if(!section_hdr) {
cli_errmsg("ELF: Can't allocate memory for section headers\n");
return CL_EMEM;
}
cli_dbgmsg("------------------------------------\n"); |
| 6ed894e0 |
}
for(i = 0; i < shnum; i++) { |
| a140a928 |
err = 0;
if(format == 1) { |
| 90b75c27 |
if(fmap_readn(map, §ion_hdr[i], shoff, sizeof(struct elf_section_hdr32)) != sizeof(struct elf_section_hdr32)) |
| a140a928 |
err = 1; |
| 90b75c27 |
shoff += sizeof(struct elf_section_hdr32); |
| a140a928 |
} else {
struct elf_section_hdr64 section_hdr64;
|
| 90b75c27 |
if(fmap_readn(map, §ion_hdr64, shoff, sizeof(section_hdr64)) != sizeof(section_hdr64)) { |
| a140a928 |
err = 1;
} else {
section_hdr[i].sh_name = section_hdr64.sh_name;
section_hdr[i].sh_type = section_hdr64.sh_type;
section_hdr[i].sh_flags = section_hdr64.sh_flags;
section_hdr[i].sh_addr = section_hdr64.sh_addr;
section_hdr[i].sh_offset = section_hdr64.sh_offset;
section_hdr[i].sh_size = section_hdr64.sh_size;
section_hdr[i].sh_link = section_hdr64.sh_link;
section_hdr[i].sh_info = section_hdr64.sh_info;
section_hdr[i].sh_addralign = section_hdr64.sh_addralign;
section_hdr[i].sh_entsize = section_hdr64.sh_entsize;
} |
| 90b75c27 |
shoff += sizeof(section_hdr64); |
| a140a928 |
} |
| 6ed894e0 |
|
| a140a928 |
if(err) { |
| 6ed894e0 |
cli_dbgmsg("ELF: Can't read section header\n");
cli_dbgmsg("ELF: Possibly broken ELF file\n");
free(section_hdr);
if(DETECT_BROKEN) { |
| 3c91998b |
if(ctx->virname) |
| 4a01b4ef |
*ctx->virname = "Heuristics.Broken.Executable"; |
| 6416cdef |
return CL_VIRUS; |
| 6ed894e0 |
}
return CL_CLEAN;
}
cli_dbgmsg("ELF: Section %d\n", i); |
| 3071071e |
cli_dbgmsg("ELF: Section offset: %d\n", EC32(section_hdr[i].sh_offset, conv));
cli_dbgmsg("ELF: Section size: %d\n", EC32(section_hdr[i].sh_size, conv)); |
| 6ed894e0 |
|
| 3071071e |
switch(EC32(section_hdr[i].sh_type, conv)) { |
| 6ed894e0 |
case 0x6: /* SHT_DYNAMIC */
cli_dbgmsg("ELF: Section type: Dynamic linking information\n");
break;
case 0xb: /* SHT_DYNSYM */
cli_dbgmsg("ELF: Section type: Symbols for dynamic linking\n");
break;
case 0xf: /* SHT_FINI_ARRAY */
cli_dbgmsg("ELF: Section type: Array of pointers to termination functions\n");
break;
case 0x5: /* SHT_HASH */
cli_dbgmsg("ELF: Section type: Symbol hash table\n");
break;
case 0xe: /* SHT_INIT_ARRAY */
cli_dbgmsg("ELF: Section type: Array of pointers to initialization functions\n");
break;
case 0x8: /* SHT_NOBITS */
cli_dbgmsg("ELF: Section type: Empty section (NOBITS)\n");
break;
case 0x7: /* SHT_NOTE */
cli_dbgmsg("ELF: Section type: Note section\n");
break;
case 0x0: /* SHT_NULL */
cli_dbgmsg("ELF: Section type: Null (no associated section)\n");
break;
case 0x10: /* SHT_PREINIT_ARRAY */
cli_dbgmsg("ELF: Section type: Array of pointers to preinit functions\n");
break;
case 0x1: /* SHT_PROGBITS */
cli_dbgmsg("ELF: Section type: Program information\n");
break;
case 0x9: /* SHT_REL */
cli_dbgmsg("ELF: Section type: Relocation entries w/o explicit addends\n");
break;
case 0x4: /* SHT_RELA */
cli_dbgmsg("ELF: Section type: Relocation entries with explicit addends\n");
break;
case 0x3: /* SHT_STRTAB */
cli_dbgmsg("ELF: Section type: String table\n");
break;
case 0x2: /* SHT_SYMTAB */
cli_dbgmsg("ELF: Section type: Symbol table\n");
break;
case 0x6ffffffd: /* SHT_GNU_verdef */
cli_dbgmsg("ELF: Section type: Provided symbol versions\n");
break;
case 0x6ffffffe: /* SHT_GNU_verneed */
cli_dbgmsg("ELF: Section type: Required symbol versions\n");
break;
case 0x6fffffff: /* SHT_GNU_versym */
cli_dbgmsg("ELF: Section type: Symbol Version Table\n");
break;
default :
cli_dbgmsg("ELF: Section type: Unknown\n");
}
|
| 3071071e |
if(EC32(section_hdr[i].sh_flags, conv) & 0x1) /* SHF_WRITE */ |
| 6ed894e0 |
cli_dbgmsg("ELF: Section contains writable data\n");
|
| 3071071e |
if(EC32(section_hdr[i].sh_flags, conv) & 0x2) /* SHF_ALLOC */ |
| 6ed894e0 |
cli_dbgmsg("ELF: Section occupies memory\n");
|
| 3071071e |
if(EC32(section_hdr[i].sh_flags, conv) & 0x4) /* SHF_EXECINSTR */ |
| 6ed894e0 |
cli_dbgmsg("ELF: Section contains executable code\n");
cli_dbgmsg("------------------------------------\n");
}
free(section_hdr);
return CL_CLEAN;
} |
| 01302683 |
|
| 49cc1e3c |
int cli_elfheader(fmap_t *map, struct cli_exe_info *elfinfo) |
| 01302683 |
{
struct elf_file_hdr32 file_hdr; |
| 87374bc0 |
struct elf_section_hdr32 *section_hdr = NULL;
struct elf_program_hdr32 *program_hdr = NULL; |
| 939b015c |
uint16_t shnum, phnum, shentsize, phentsize, i;
uint32_t entry, fentry = 0, shoff, phoff;
uint8_t conv = 0, err; |
| a140a928 |
unsigned int format; |
| 01302683 |
cli_dbgmsg("in cli_elfheader\n");
|
| 90b75c27 |
if(fmap_readn(map, &file_hdr, 0, sizeof(file_hdr)) != sizeof(file_hdr)) { |
| 01302683 |
/* Not an ELF file? */
cli_dbgmsg("ELF: Can't read file header\n");
return -1;
}
if(memcmp(file_hdr.e_ident, "\x7f\x45\x4c\x46", 4)) {
cli_dbgmsg("ELF: Not an ELF file\n");
return -1;
}
|
| a140a928 |
format = file_hdr.e_ident[4];
if(format != 1 && format != 2) {
cli_dbgmsg("ELF: Unknown ELF class (%u)\n", file_hdr.e_ident[4]); |
| 01302683 |
return -1;
}
|
| a140a928 |
if(format == 2) {
struct elf_file_hdr64 file_hdr64; |
| 90b75c27 |
if(!fmap_readn(map, &file_hdr64, 0, sizeof(file_hdr64)) != sizeof(file_hdr64)) { |
| a140a928 |
/* Not an ELF file? */
cli_dbgmsg("ELF: Can't read file header\n");
return -1;
}
/* it's enough for us to handle ELF64 as 32 */
file_hdr.e_entry = file_hdr64.e_entry;
file_hdr.e_phoff = file_hdr64.e_phoff;
file_hdr.e_shoff = file_hdr64.e_shoff;
file_hdr.e_flags = file_hdr64.e_flags;
file_hdr.e_ehsize = file_hdr64.e_ehsize;
file_hdr.e_phentsize = file_hdr64.e_phentsize;
if(file_hdr.e_phentsize == sizeof(struct elf_program_hdr64))
file_hdr.e_phentsize = sizeof(struct elf_program_hdr32);
file_hdr.e_phnum = file_hdr64.e_phnum;
file_hdr.e_shentsize = file_hdr64.e_shentsize;
if(file_hdr.e_shentsize == sizeof(struct elf_section_hdr64))
file_hdr.e_shentsize = sizeof(struct elf_section_hdr32);
file_hdr.e_shnum = file_hdr64.e_shnum;
file_hdr.e_shstrndx = file_hdr64.e_shstrndx;
}
|
| 01302683 |
if(file_hdr.e_ident[5] == 1) {
#if WORDS_BIGENDIAN == 1 |
| 3071071e |
conv = 1; |
| 01302683 |
#endif
} else {
#if WORDS_BIGENDIAN == 0 |
| 3071071e |
conv = 1; |
| 01302683 |
#endif
}
|
| 939b015c |
phnum = EC16(file_hdr.e_phnum, conv);
if(phnum > 128) {
cli_dbgmsg("ELF: Suspicious number of program headers\n");
return -1;
} |
| 3071071e |
entry = EC32(file_hdr.e_entry, conv); |
| 01302683 |
|
| 939b015c |
if(phnum && entry) {
phentsize = EC16(file_hdr.e_phentsize, conv);
if(phentsize != sizeof(struct elf_program_hdr32)) {
cli_dbgmsg("ELF: phentsize != sizeof(struct elf_program_hdr32)\n");
return -1;
}
phoff = EC32(file_hdr.e_phoff, conv);
program_hdr = (struct elf_program_hdr32 *) cli_calloc(phnum, phentsize);
if(!program_hdr) {
cli_errmsg("ELF: Can't allocate memory for program headers\n");
return -1;
}
for(i = 0; i < phnum; i++) { |
| a140a928 |
err = 0;
if(format == 1) { |
| 90b75c27 |
if(fmap_readn(map, &program_hdr[i], phoff, sizeof(struct elf_program_hdr32)) != sizeof(struct elf_program_hdr32)) |
| a140a928 |
err = 1; |
| 90b75c27 |
phoff += sizeof(struct elf_program_hdr32); |
| a140a928 |
} else {
struct elf_program_hdr64 program_hdr64;
|
| 90b75c27 |
if(fmap_readn(map, &program_hdr64, phoff, sizeof(program_hdr64)) != sizeof(program_hdr64)) { |
| a140a928 |
err = 1;
} else {
program_hdr[i].p_type = program_hdr64.p_type;
program_hdr[i].p_offset = program_hdr64.p_offset;
program_hdr[i].p_vaddr = program_hdr64.p_vaddr;
program_hdr[i].p_paddr = program_hdr64.p_paddr;
program_hdr[i].p_filesz = program_hdr64.p_filesz;
program_hdr[i].p_memsz = program_hdr64.p_memsz;
program_hdr[i].p_flags = program_hdr64.p_flags;
program_hdr[i].p_align = program_hdr64.p_align;
} |
| 90b75c27 |
phoff += sizeof(program_hdr64); |
| a140a928 |
}
if(err) { |
| 939b015c |
cli_dbgmsg("ELF: Can't read segment #%d\n", i);
free(program_hdr);
return -1;
}
}
fentry = cli_rawaddr(entry, program_hdr, phnum, conv, &err);
free(program_hdr);
if(err) {
cli_dbgmsg("ELF: Can't calculate file offset of entry point\n");
return -1;
}
}
elfinfo->ep = fentry;
|
| 3071071e |
shnum = EC16(file_hdr.e_shnum, conv); |
| 01302683 |
if(shnum > 256) {
cli_dbgmsg("ELF: Suspicious number of sections\n");
return -1;
}
elfinfo->nsections = shnum;
|
| 3071071e |
shentsize = EC16(file_hdr.e_shentsize, conv); |
| 01302683 |
if(shentsize != sizeof(struct elf_section_hdr32)) {
cli_dbgmsg("ELF: shentsize != sizeof(struct elf_section_hdr32)\n");
return -1;
}
|
| 3071071e |
shoff = EC32(file_hdr.e_shoff, conv); |
| 01302683 |
elfinfo->section = (struct cli_exe_section *) cli_calloc(elfinfo->nsections, sizeof(struct cli_exe_section));
if(!elfinfo->section) {
cli_dbgmsg("ELF: Can't allocate memory for section headers\n");
return -1;
}
|
| 87374bc0 |
if(shnum) {
section_hdr = (struct elf_section_hdr32 *) cli_calloc(shnum, shentsize);
if(!section_hdr) {
cli_errmsg("ELF: Can't allocate memory for section headers\n");
free(elfinfo->section);
elfinfo->section = NULL;
return -1;
} |
| 01302683 |
}
for(i = 0; i < shnum; i++) { |
| a140a928 |
err = 0;
if(format == 1) { |
| 90b75c27 |
if(fmap_readn(map, §ion_hdr[i], shoff, sizeof(struct elf_section_hdr32)) != sizeof(struct elf_section_hdr32)) |
| a140a928 |
err = 1; |
| 90b75c27 |
shoff += sizeof(struct elf_section_hdr32); |
| a140a928 |
} else {
struct elf_section_hdr64 section_hdr64;
|
| 90b75c27 |
if(fmap_readn(map, §ion_hdr64, shoff, sizeof(section_hdr64)) != sizeof(section_hdr64)) { |
| a140a928 |
err = 1;
} else {
section_hdr[i].sh_name = section_hdr64.sh_name;
section_hdr[i].sh_type = section_hdr64.sh_type;
section_hdr[i].sh_flags = section_hdr64.sh_flags;
section_hdr[i].sh_addr = section_hdr64.sh_addr;
section_hdr[i].sh_offset = section_hdr64.sh_offset;
section_hdr[i].sh_size = section_hdr64.sh_size;
section_hdr[i].sh_link = section_hdr64.sh_link;
section_hdr[i].sh_info = section_hdr64.sh_info;
section_hdr[i].sh_addralign = section_hdr64.sh_addralign;
section_hdr[i].sh_entsize = section_hdr64.sh_entsize;
} |
| 90b75c27 |
shoff += sizeof(section_hdr64); |
| a140a928 |
} |
| 01302683 |
|
| a140a928 |
if(err) {
cli_dbgmsg("ELF: Can't read section header\n"); |
| 01302683 |
free(section_hdr);
free(elfinfo->section); |
| 841161e0 |
elfinfo->section = NULL; |
| 01302683 |
return -1;
} |
| 3071071e |
elfinfo->section[i].rva = EC32(section_hdr[i].sh_addr, conv);
elfinfo->section[i].raw = EC32(section_hdr[i].sh_offset, conv);
elfinfo->section[i].rsz = EC32(section_hdr[i].sh_size, conv); |
| 01302683 |
}
free(section_hdr);
return 0;
} |