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Fix VTOY_LINUX_REMOUNT option does not work with latest linux kernel version. (#2661 #2674)

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This commit is contained in:
longpanda 2024-01-24 12:09:29 +08:00
parent 4527e1db79
commit c7693d4ecd
10 changed files with 247 additions and 36 deletions
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185
DMPATCH/dmpatch.c
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@ -53,6 +53,9 @@ typedef struct ko_param
unsigned long sym_put_size;
unsigned long kv_major;
unsigned long ibt;
unsigned long kv_minor;
unsigned long blkdev_get_addr;
unsigned long blkdev_put_addr;
unsigned long padding[1];
}ko_param;
@ -150,10 +153,11 @@ static volatile ko_param g_ko_param =
#define vdebug(fmt, args...) if(kprintf) kprintf(KERN_ERR fmt, ##args)
static unsigned int g_claim_ptr = 0;
static unsigned char *g_get_patch[MAX_PATCH] = { NULL };
static unsigned char *g_put_patch[MAX_PATCH] = { NULL };
static void notrace dmpatch_restore_code(unsigned char *opCode)
static void notrace dmpatch_restore_code(int bytes, unsigned char *opCode, unsigned int code)
{
unsigned long align;
@ -161,7 +165,14 @@ static void notrace dmpatch_restore_code(unsigned char *opCode)
{
align = (unsigned long)opCode / g_ko_param.pgsize * g_ko_param.pgsize;
set_mem_rw(align, 1);
*opCode = 0x80;
if (bytes == 1)
{
*opCode = (unsigned char)code;
}
else
{
*(unsigned int *)opCode = code;
}
set_mem_ro(align, 1);
}
}
@ -235,6 +246,121 @@ static int notrace dmpatch_replace_code
return 0;
}
static unsigned long dmpatch_find_call_offset(unsigned long addr, unsigned long size, unsigned long func)
{
unsigned long i = 0;
unsigned long dest;
unsigned char *opCode = NULL;
unsigned char aucOffset[8] = { 0, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF };
opCode = (unsigned char *)addr;
for (i = 0; i + 4 < size; i++)
{
if (opCode[i] == 0xE8)
{
aucOffset[0] = opCode[i + 1];
aucOffset[1] = opCode[i + 2];
aucOffset[2] = opCode[i + 3];
aucOffset[3] = opCode[i + 4];
dest = addr + i + 5 + *(unsigned long *)aucOffset;
if (dest == func)
{
return i;
}
}
}
return 0;
}
static unsigned int dmpatch_patch_claim_ptr(void)
{
unsigned long i = 0;
unsigned long t = 0;
unsigned long offset1;
unsigned long offset2;
unsigned long align;
unsigned char *opCode = NULL;
vdebug("Get addr: 0x%lx %lu 0x%lx\n", g_ko_param.sym_get_addr, g_ko_param.sym_get_size, g_ko_param.blkdev_get_addr);
vdebug("Put addr: 0x%lx %lu 0x%lx\n", g_ko_param.sym_put_addr, g_ko_param.sym_put_size, g_ko_param.blkdev_put_addr);
opCode = (unsigned char *)g_ko_param.sym_get_addr;
for (i = 0; i < 4; i++)
{
vdebug("%02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n",
opCode[i + 0], opCode[i + 1], opCode[i + 2], opCode[i + 3],
opCode[i + 4], opCode[i + 5], opCode[i + 6], opCode[i + 7],
opCode[i + 8], opCode[i + 9], opCode[i + 10], opCode[i + 11],
opCode[i + 12], opCode[i + 13], opCode[i + 14], opCode[i + 15]);
}
offset1 = dmpatch_find_call_offset(g_ko_param.sym_get_addr, g_ko_param.sym_get_size, g_ko_param.blkdev_get_addr);
offset2 = dmpatch_find_call_offset(g_ko_param.sym_put_addr, g_ko_param.sym_put_size, g_ko_param.blkdev_put_addr);
if (offset1 == 0 || offset2 == 0)
{
vdebug("call blkdev_get or blkdev_put Not found, %lu %lu\n", offset1, offset2);
return 1;
}
vdebug("call addr1:0x%lx call addr2:0x%lx\n",
g_ko_param.sym_get_addr + offset1,
g_ko_param.sym_put_addr + offset2);
opCode = (unsigned char *)g_ko_param.sym_get_addr;
for (i = offset1 - 1, t = 0; (i > 0) && (t < 24); i--, t++)
{
/* rdx */
if (opCode[i] == 0x48 && opCode[i + 1] == 0xc7 && opCode[i + 2] == 0xc2)
{
g_claim_ptr = *(unsigned int *)(opCode + i + 3);
g_get_patch[0] = opCode + i + 3;
vdebug("claim_ptr(%08X) found at get addr 0x%lx\n", g_claim_ptr, g_ko_param.sym_get_addr + i + 3);
break;
}
}
if (g_claim_ptr == 0)
{
vdebug("Claim_ptr not found in get\n");
return 1;
}
opCode = (unsigned char *)g_ko_param.sym_put_addr;
for (i = offset2 - 1, t = 0; (i > 0) && (t < 24); i--, t++)
{
/* rsi */
if (opCode[i] == 0x48 && opCode[i + 1] == 0xc7 && opCode[i + 2] == 0xc6)
{
if (*(unsigned int *)(opCode + i + 3) == g_claim_ptr)
{
vdebug("claim_ptr found at put addr 0x%lx\n", g_ko_param.sym_put_addr + i + 3);
g_put_patch[0] = opCode + i + 3;
break;
}
}
}
if (g_put_patch[0] == 0)
{
vdebug("Claim_ptr not found in put\n");
return 1;
}
align = (unsigned long)g_get_patch[0] / g_ko_param.pgsize * g_ko_param.pgsize;
set_mem_rw(align, 1);
*(unsigned int *)(g_get_patch[0]) = 0;
set_mem_ro(align, 1);
align = (unsigned long)g_put_patch[0] / g_ko_param.pgsize * g_ko_param.pgsize;
set_mem_rw(align, 1);
*(unsigned int *)(g_put_patch[0]) = 0;
set_mem_ro(align, 1);
return 0;
}
#ifdef VTOY_IBT
static __always_inline unsigned long long dmpatch_rdmsr(unsigned int msr)
{
@ -297,7 +423,8 @@ static int notrace dmpatch_init(void)
kprintf = (printk_pf)(g_ko_param.printk_addr);
vdebug("dmpatch_init start pagesize=%lu ...\n", g_ko_param.pgsize);
vdebug("dmpatch_init start pagesize=%lu kernel=%lu.%lu ...\n",
g_ko_param.pgsize, g_ko_param.kv_major, g_ko_param.kv_minor);
if (g_ko_param.struct_size != sizeof(ko_param))
{
@ -316,20 +443,27 @@ static int notrace dmpatch_init(void)
reg_kprobe = (kprobe_reg_pf)g_ko_param.reg_kprobe_addr;
unreg_kprobe = (kprobe_unreg_pf)g_ko_param.unreg_kprobe_addr;
r = dmpatch_replace_code(1, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 2, "dm_get_table_device", g_get_patch);
if (r && g_ko_param.kv_major >= 5)
if (g_ko_param.kv_major > 6 || (g_ko_param.kv_major == 6 && g_ko_param.kv_minor >= 5))
{
vdebug("new2 patch dm_get_table_device...\n");
r = dmpatch_replace_code(2, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 1, "dm_get_table_device", g_get_patch);
vdebug("new interface patch dm_get_table_device...\n");
r = dmpatch_patch_claim_ptr();
}
else
{
r = dmpatch_replace_code(1, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 2, "dm_get_table_device", g_get_patch);
if (r && g_ko_param.kv_major >= 5)
{
vdebug("new2 patch dm_get_table_device...\n");
r = dmpatch_replace_code(2, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 1, "dm_get_table_device", g_get_patch);
}
if (r && g_ko_param.kv_major >= 5)
{
vdebug("new3 patch dm_get_table_device...\n");
r = dmpatch_replace_code(3, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 1, "dm_get_table_device", g_get_patch);
}
}
if (r && g_ko_param.kv_major >= 5)
{
vdebug("new3 patch dm_get_table_device...\n");
r = dmpatch_replace_code(3, g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 1, "dm_get_table_device", g_get_patch);
}
if (r)
{
rc = -EINVAL;
@ -337,7 +471,14 @@ static int notrace dmpatch_init(void)
}
vdebug("patch dm_get_table_device success\n");
r = dmpatch_replace_code(1, g_ko_param.sym_put_addr, g_ko_param.sym_put_size, 1, "dm_put_table_device", g_put_patch);
if (g_ko_param.kv_major >= 6 && g_ko_param.kv_minor >= 5)
{
r = 0;
}
else
{
r = dmpatch_replace_code(1, g_ko_param.sym_put_addr, g_ko_param.sym_put_size, 1, "dm_put_table_device", g_put_patch);
}
if (r)
{
rc = -EINVAL;
@ -369,10 +510,18 @@ static void notrace dmpatch_exit(void)
msr = dmpatch_ibt_save();
}
for (i = 0; i < MAX_PATCH; i++)
if (g_claim_ptr)
{
dmpatch_restore_code(g_get_patch[i]);
dmpatch_restore_code(g_put_patch[i]);
dmpatch_restore_code(4, g_get_patch[0], g_claim_ptr);
dmpatch_restore_code(4, g_put_patch[0], g_claim_ptr);
}
else
{
for (i = 0; i < MAX_PATCH; i++)
{
dmpatch_restore_code(1, g_get_patch[i], 0x80);
dmpatch_restore_code(1, g_put_patch[i], 0x80);
}
}
vdebug("dmpatch_exit success\n");