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Ventoy/VtoyTool/vtoykmod.c

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/******************************************************************************
* vtoykmod.c ---- ventoy kmod
*
* Copyright (c) 2021, longpanda <admin@ventoy.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef VTOY_X86_64
#include <cpuid.h>
#endif
#define _ull unsigned long long
#define magic_sig 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF
#define EI_NIDENT (16)
#define EI_MAG0 0 /* e_ident[] indexes */
#define EI_MAG1 1
#define EI_MAG2 2
#define EI_MAG3 3
#define EI_CLASS 4
#define EI_DATA 5
#define EI_VERSION 6
#define EI_OSABI 7
#define EI_PAD 8
#define ELFMAG0 0x7f /* EI_MAG */
#define ELFMAG1 'E'
#define ELFMAG2 'L'
#define ELFMAG3 'F'
#define ELFMAG "\177ELF"
#define SELFMAG 4
#define ELFCLASSNONE 0 /* EI_CLASS */
#define ELFCLASS32 1
#define ELFCLASS64 2
#define ELFCLASSNUM 3
#define ELFDATANONE 0 /* e_ident[EI_DATA] */
#define ELFDATA2LSB 1
#define ELFDATA2MSB 2
#define EV_NONE 0 /* e_version, EI_VERSION */
#define EV_CURRENT 1
#define EV_NUM 2
#define ELFOSABI_NONE 0
#define ELFOSABI_LINUX 3
#define SHT_STRTAB 3
#pragma pack(1)
typedef struct
{
unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
uint16_t e_type; /* Object file type */
uint16_t e_machine; /* Architecture */
uint32_t e_version; /* Object file version */
uint32_t e_entry; /* Entry point virtual address */
uint32_t e_phoff; /* Program header table file offset */
uint32_t e_shoff; /* Section header table file offset */
uint32_t e_flags; /* Processor-specific flags */
uint16_t e_ehsize; /* ELF header size in bytes */
uint16_t e_phentsize; /* Program header table entry size */
uint16_t e_phnum; /* Program header table entry count */
uint16_t e_shentsize; /* Section header table entry size */
uint16_t e_shnum; /* Section header table entry count */
uint16_t e_shstrndx; /* Section header string table index */
} Elf32_Ehdr;
typedef struct
{
unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
uint16_t e_type; /* Object file type */
uint16_t e_machine; /* Architecture */
uint32_t e_version; /* Object file version */
uint64_t e_entry; /* Entry point virtual address */
uint64_t e_phoff; /* Program header table file offset */
uint64_t e_shoff; /* Section header table file offset */
uint32_t e_flags; /* Processor-specific flags */
uint16_t e_ehsize; /* ELF header size in bytes */
uint16_t e_phentsize; /* Program header table entry size */
uint16_t e_phnum; /* Program header table entry count */
uint16_t e_shentsize; /* Section header table entry size */
uint16_t e_shnum; /* Section header table entry count */
uint16_t e_shstrndx; /* Section header string table index */
} Elf64_Ehdr;
typedef struct
{
uint32_t sh_name; /* Section name (string tbl index) */
uint32_t sh_type; /* Section type */
uint32_t sh_flags; /* Section flags */
uint32_t sh_addr; /* Section virtual addr at execution */
uint32_t sh_offset; /* Section file offset */
uint32_t sh_size; /* Section size in bytes */
uint32_t sh_link; /* Link to another section */
uint32_t sh_info; /* Additional section information */
uint32_t sh_addralign; /* Section alignment */
uint32_t sh_entsize; /* Entry size if section holds table */
} Elf32_Shdr;
typedef struct
{
uint32_t sh_name; /* Section name (string tbl index) */
uint32_t sh_type; /* Section type */
uint64_t sh_flags; /* Section flags */
uint64_t sh_addr; /* Section virtual addr at execution */
uint64_t sh_offset; /* Section file offset */
uint64_t sh_size; /* Section size in bytes */
uint32_t sh_link; /* Link to another section */
uint32_t sh_info; /* Additional section information */
uint64_t sh_addralign; /* Section alignment */
uint64_t sh_entsize; /* Entry size if section holds table */
} Elf64_Shdr;
typedef struct elf32_rel {
uint32_t r_offset;
uint32_t r_info;
} Elf32_Rel;
typedef struct elf64_rel {
uint64_t r_offset; /* Location at which to apply the action */
uint64_t r_info; /* index and type of relocation */
} Elf64_Rel;
typedef struct elf32_rela{
uint32_t r_offset;
uint32_t r_info;
int32_t r_addend;
} Elf32_Rela;
typedef struct elf64_rela {
uint64_t r_offset; /* Location at which to apply the action */
uint64_t r_info; /* index and type of relocation */
int64_t r_addend; /* Constant addend used to compute value */
} Elf64_Rela;
struct modversion_info {
unsigned long crc;
char name[64 - sizeof(unsigned long)];
};
struct modversion_info2 {
/* Offset of the next modversion entry in relation to this one. */
uint32_t next;
uint32_t crc;
char name[0];
};
typedef struct ko_param
{
unsigned char magic[16];
unsigned long struct_size;
unsigned long pgsize;
unsigned long printk_addr;
unsigned long ro_addr;
unsigned long rw_addr;
unsigned long reg_kprobe_addr;
unsigned long unreg_kprobe_addr;
unsigned long sym_get_addr;
unsigned long sym_get_size;
unsigned long sym_put_addr;
unsigned long sym_put_size;
unsigned long kv_major;
unsigned long ibt;
unsigned long padding[1];
}ko_param;
#pragma pack()
static int verbose = 0;
#define debug(fmt, ...) if(verbose) printf(fmt, ##__VA_ARGS__)
static int vtoykmod_write_file(char *name, void *buf, int size)
{
FILE *fp;
fp = fopen(name, "wb+");
if (!fp)
{
return -1;
}
fwrite(buf, 1, size, fp);
fclose(fp);
return 0;
}
static int vtoykmod_read_file(char *name, char **buf)
{
int size;
FILE *fp;
char *databuf;
fp = fopen(name, "rb");
if (!fp)
{
debug("failed to open %s %d\n", name, errno);
return -1;
}
fseek(fp, 0, SEEK_END);
size = (int)ftell(fp);
fseek(fp, 0, SEEK_SET);
databuf = malloc(size);
if (!databuf)
{
debug("failed to open malloc %d\n", size);
return -1;
}
fread(databuf, 1, size, fp);
fclose(fp);
*buf = databuf;
return size;
}
static int vtoykmod_find_section64(char *buf, char *section, int *offset, int *len)
{
uint16_t i;
int cmplen;
char *name = NULL;
char *strtbl = NULL;
Elf64_Ehdr *elf = NULL;
Elf64_Shdr *sec = NULL;
cmplen = (int)strlen(section);
elf = (Elf64_Ehdr *)buf;
sec = (Elf64_Shdr *)(buf + elf->e_shoff);
strtbl = buf + sec[elf->e_shstrndx].sh_offset;
for (i = 0; i < elf->e_shnum; i++)
{
name = strtbl + sec[i].sh_name;
if (name && strncmp(name, section, cmplen) == 0)
{
*offset = (int)(sec[i].sh_offset);
*len = (int)(sec[i].sh_size);
return 0;
}
}
return 1;
}
static int vtoykmod_find_section32(char *buf, char *section, int *offset, int *len)
{
uint16_t i;
int cmplen;
char *name = NULL;
char *strtbl = NULL;
Elf32_Ehdr *elf = NULL;
Elf32_Shdr *sec = NULL;
cmplen = (int)strlen(section);
elf = (Elf32_Ehdr *)buf;
sec = (Elf32_Shdr *)(buf + elf->e_shoff);
strtbl = buf + sec[elf->e_shstrndx].sh_offset;
for (i = 0; i < elf->e_shnum; i++)
{
name = strtbl + sec[i].sh_name;
if (name && strncmp(name, section, cmplen) == 0)
{
*offset = (int)(sec[i].sh_offset);
*len = (int)(sec[i].sh_size);
return 0;
}
}
return 1;
}
static int vtoykmod_update_modcrc1(char *oldmodver, int oldcnt, char *newmodver, int newcnt)
{
int i, j;
struct modversion_info *pold, *pnew;
pold = (struct modversion_info *)oldmodver;
pnew = (struct modversion_info *)newmodver;
debug("module update modver format 1\n");
for (i = 0; i < oldcnt; i++)
{
for (j = 0; j < newcnt; j++)
{
if (strcmp(pold[i].name, pnew[j].name) == 0)
{
debug("CRC 0x%08lx --> 0x%08lx %s\n", pold[i].crc, pnew[i].crc, pold[i].name);
pold[i].crc = pnew[j].crc;
break;
}
}
}
return 0;
}
static int vtoykmod_update_modcrc2(char *oldmodver, int oldlen, char *newmodver, int newlen)
{
struct modversion_info2 *pold, *pnew, *pnewend;
pold = (struct modversion_info2 *)oldmodver;
pnew = (struct modversion_info2 *)newmodver;
pnewend = (struct modversion_info2 *)(newmodver + newlen);
debug("module update modver format 2\n");
/* here we think that there is only module_layout in oldmodver */
for (; pnew < pnewend && pnew->next; pnew = (struct modversion_info2 *)((char *)pnew + pnew->next))
{
if (strcmp(pnew->name, "module_layout") == 0)
{
debug("CRC 0x%08x --> 0x%08x %s\n", pold->crc, pnew->crc, pnew->name);
memset(pold, 0, oldlen);
pold->next = 0x18; /* 8 + module_layout align 8 */
pold->crc = pnew->crc;
strcpy(pold->name, pnew->name);
break;
}
}
return 0;
}
static int vtoykmod_update_modcrc(char *oldmodver, int oldlen, char *newmodver, int newlen)
{
uint32_t uiCrc = 0;
memcpy(&uiCrc, newmodver + 4, 4);
if (uiCrc > 0)
{
return vtoykmod_update_modcrc2(oldmodver, oldlen, newmodver, newlen);
}
else
{
return vtoykmod_update_modcrc1(oldmodver, oldlen / 64, newmodver, newlen / 64);
}
}
static int vtoykmod_update_vermagic(char *oldbuf, int oldsize, char *newbuf, int newsize, int *modver)
{
int i = 0;
char *oldver = NULL;
char *newver = NULL;
*modver = 0;
for (i = 0; i < oldsize - 9; i++)
{
if (strncmp(oldbuf + i, "vermagic=", 9) == 0)
{
oldver = oldbuf + i + 9;
debug("Find old vermagic at %d <%s>\n", i, oldver);
break;
}
}
for (i = 0; i < newsize - 9; i++)
{
if (strncmp(newbuf + i, "vermagic=", 9) == 0)
{
newver = newbuf + i + 9;
debug("Find new vermagic at %d <%s>\n", i, newver);
break;
}
}
if (oldver && newver)
{
memcpy(oldver, newver, strlen(newver) + 1);
//if (strstr(newver, "modversions"))
{
*modver = 1;
}
}
return 0;
}
int vtoykmod_update(char *oldko, char *newko)
{
int rc = 0;
int modver = 0;
int oldoff, oldlen;
int newoff, newlen;
int oldsize, newsize;
char *newbuf, *oldbuf;
oldsize = vtoykmod_read_file(oldko, &oldbuf);
newsize = vtoykmod_read_file(newko, &newbuf);
if (oldsize < 0 || newsize < 0)
{
return 1;
}
/* 1: update vermagic */
vtoykmod_update_vermagic(oldbuf, oldsize, newbuf, newsize, &modver);
/* 2: update modversion crc */
if (modver)
{
if (oldbuf[EI_CLASS] == ELFCLASS64)
{
rc = vtoykmod_find_section64(oldbuf, "__versions", &oldoff, &oldlen);
rc += vtoykmod_find_section64(newbuf, "__versions", &newoff, &newlen);
}
else
{
rc = vtoykmod_find_section32(oldbuf, "__versions", &oldoff, &oldlen);
rc += vtoykmod_find_section32(newbuf, "__versions", &newoff, &newlen);
}
if (rc == 0)
{
vtoykmod_update_modcrc(oldbuf + oldoff, oldlen, newbuf + newoff, newlen);
}
}
else
{
debug("no need to proc modversions\n");
}
/* 3: update relocate address */
if (oldbuf[EI_CLASS] == ELFCLASS64)
{
Elf64_Rela *oldRela, *newRela;
rc = vtoykmod_find_section64(oldbuf, ".rela.gnu.linkonce.this_module", &oldoff, &oldlen);
rc += vtoykmod_find_section64(newbuf, ".rela.gnu.linkonce.this_module", &newoff, &newlen);
if (rc == 0)
{
oldRela = (Elf64_Rela *)(oldbuf + oldoff);
newRela = (Elf64_Rela *)(newbuf + newoff);
debug("init_module rela: 0x%llx --> 0x%llx\n", (_ull)(oldRela[0].r_offset), (_ull)(newRela[0].r_offset));
oldRela[0].r_offset = newRela[0].r_offset;
oldRela[0].r_addend = newRela[0].r_addend;
debug("cleanup_module rela: 0x%llx --> 0x%llx\n", (_ull)(oldRela[1].r_offset), (_ull)(newRela[1].r_offset));
oldRela[1].r_offset = newRela[1].r_offset;
oldRela[1].r_addend = newRela[1].r_addend;
}
else
{
debug("section .rela.gnu.linkonce.this_module not found\n");
}
}
else
{
Elf32_Rel *oldRel, *newRel;
rc = vtoykmod_find_section32(oldbuf, ".rel.gnu.linkonce.this_module", &oldoff, &oldlen);
rc += vtoykmod_find_section32(newbuf, ".rel.gnu.linkonce.this_module", &newoff, &newlen);
if (rc == 0)
{
oldRel = (Elf32_Rel *)(oldbuf + oldoff);
newRel = (Elf32_Rel *)(newbuf + newoff);
debug("init_module rel: 0x%x --> 0x%x\n", oldRel[0].r_offset, newRel[0].r_offset);
oldRel[0].r_offset = newRel[0].r_offset;
debug("cleanup_module rel: 0x%x --> 0x%x\n", oldRel[0].r_offset, newRel[0].r_offset);
oldRel[1].r_offset = newRel[1].r_offset;
}
else
{
debug("section .rel.gnu.linkonce.this_module not found\n");
}
}
vtoykmod_write_file(oldko, oldbuf, oldsize);
free(oldbuf);
free(newbuf);
return 0;
}
int vtoykmod_fill_param(char **argv)
{
int i;
int size;
char *buf = NULL;
ko_param *param;
unsigned char magic[16] = { magic_sig };
size = vtoykmod_read_file(argv[0], &buf);
if (size < 0)
{
return 1;
}
for (i = 0; i < size; i++)
{
if (memcmp(buf + i, magic, 16) == 0)
{
debug("Find param magic at %d\n", i);
param = (ko_param *)(buf + i);
param->struct_size = (unsigned long)sizeof(ko_param);
param->pgsize = strtoul(argv[1], NULL, 10);
param->printk_addr = strtoul(argv[2], NULL, 16);
param->ro_addr = strtoul(argv[3], NULL, 16);
param->rw_addr = strtoul(argv[4], NULL, 16);
param->sym_get_addr = strtoul(argv[5], NULL, 16);
param->sym_get_size = strtoul(argv[6], NULL, 10);
param->sym_put_addr = strtoul(argv[7], NULL, 16);
param->sym_put_size = strtoul(argv[8], NULL, 10);
param->reg_kprobe_addr = strtoul(argv[9], NULL, 16);
param->unreg_kprobe_addr = strtoul(argv[10], NULL, 16);
param->kv_major = (unsigned long)(argv[11][0] - '0');
param->ibt = strtoul(argv[12], NULL, 16);;
debug("pgsize=%lu (%s)\n", param->pgsize, argv[1]);
debug("printk_addr=0x%lx (%s)\n", param->printk_addr, argv[2]);
debug("ro_addr=0x%lx (%s)\n", param->ro_addr, argv[3]);
debug("rw_addr=0x%lx (%s)\n", param->rw_addr, argv[4]);
debug("sym_get_addr=0x%lx (%s)\n", param->sym_get_addr, argv[5]);
debug("sym_get_size=%lu (%s)\n", param->sym_get_size, argv[6]);
debug("sym_put_addr=0x%lx (%s)\n", param->sym_put_addr, argv[7]);
debug("sym_put_size=%lu (%s)\n", param->sym_put_size, argv[8]);
debug("reg_kprobe_addr=0x%lx (%s)\n", param->reg_kprobe_addr, argv[9]);
debug("unreg_kprobe_addr=0x%lx (%s)\n", param->unreg_kprobe_addr, argv[10]);
debug("kv_major=%lu (%s)\n", param->kv_major, argv[11]);
debug("ibt=0x%lx (%s)\n", param->ibt, argv[12]);
break;
}
}
if (i >= size)
{
debug("### param magic not found \n");
}
vtoykmod_write_file(argv[0], buf, size);
free(buf);
return 0;
}
#ifdef VTOY_X86_64
static int vtoykmod_check_ibt(void)
{
uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
__cpuid_count(7, 0, eax, ebx, ecx, edx);
if (edx & (1 << 20))
{
return 0;
}
return 1;
}
#else
static int vtoykmod_check_ibt(void)
{
return 1;
}
#endif
int vtoykmod_main(int argc, char **argv)
{
int i;
for (i = 0; i < argc; i++)
{
if (argv[i][0] == '-' && argv[i][1] == 'v')
{
verbose = 1;
break;
}
}
if (argv[1][0] == '-' && argv[1][1] == 'f')
{
return vtoykmod_fill_param(argv + 2);
}
else if (argv[1][0] == '-' && argv[1][1] == 'u')
{
return vtoykmod_update(argv[2], argv[3]);
}
else if (argv[1][0] == '-' && argv[1][1] == 'I')
{
return vtoykmod_check_ibt();
}
return 0;
}
// wrapper main
#ifndef BUILD_VTOY_TOOL
int main(int argc, char **argv)
{
return vtoykmod_main(argc, argv);
}
#endif
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