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Fix a bug that VTOY_LINUX_REMOUNT option doesn't take effect in openSUSE.

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This commit is contained in:
longpanda
2022-07-13 22:40:32 +08:00
parent 602e8c7fdf
commit 096cc99c3c
4 changed files with 49 additions and 6 deletions
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38
DMPATCH/dmpatch.c
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@@ -82,12 +82,34 @@ static volatile ko_param g_ko_param =
#define vdebug(fmt, args...) if(kprintf) kprintf(KERN_ERR fmt, ##args)
static int notrace dmpatch_replace_code(unsigned long addr, unsigned long size, int expect, const char *desc)
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)
{
unsigned long align;
if (opCode)
{
align = (unsigned long)opCode / g_ko_param.pgsize * g_ko_param.pgsize;
set_mem_rw(align, 1);
*opCode = 0x80;
set_mem_ro(align, 1);
}
}
static int notrace dmpatch_replace_code
(
unsigned long addr,
unsigned long size,
int expect,
const char *desc,
unsigned char **patch
)
{
int i = 0;
int cnt = 0;
unsigned long align;
unsigned char *patch[MAX_PATCH];
unsigned char *opCode = (unsigned char *)addr;
vdebug("patch for %s 0x%lx %d\n", desc, addr, (int)size);
@@ -147,7 +169,7 @@ 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(g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 2, "dm_get_table_device");
r = dmpatch_replace_code(g_ko_param.sym_get_addr, g_ko_param.sym_get_size, 2, "dm_get_table_device", g_get_patch);
if (r)
{
rc = -EINVAL;
@@ -155,7 +177,7 @@ static int notrace dmpatch_init(void)
}
vdebug("patch dm_get_table_device success\n");
r = dmpatch_replace_code(g_ko_param.sym_put_addr, g_ko_param.sym_put_size, 1, "dm_put_table_device");
r = dmpatch_replace_code(g_ko_param.sym_put_addr, g_ko_param.sym_put_size, 1, "dm_put_table_device", g_put_patch);
if (r)
{
rc = -EINVAL;
@@ -174,7 +196,15 @@ out:
static void notrace dmpatch_exit(void)
{
int i = 0;
for (i = 0; i < MAX_PATCH; i++)
{
dmpatch_restore_code(g_get_patch[i]);
dmpatch_restore_code(g_put_patch[i]);
}
vdebug("dmpatch_exit success\n");
}
module_init(dmpatch_init);