X-Git-Url: https://glassweightruler.freedombox.rocks/gitweb/Ventoy.git/blobdiff_plain/1f49265f29459295bc1b66c53da3de9e99a9370e..abfc2a63437917e256dd5112da033fcc4efcb58f:/DMPATCH/dmpatch.c

diff --git a/DMPATCH/dmpatch.c b/DMPATCH/dmpatch.c
index 1106d79..359c5c3 100644
--- a/DMPATCH/dmpatch.c
+++ b/DMPATCH/dmpatch.c
@@ -51,7 +51,8 @@ typedef struct ko_param
     unsigned long sym_get_size;
     unsigned long sym_put_addr;
     unsigned long sym_put_size;
-    unsigned long padding[3];
+    unsigned long kv_major;
+    unsigned long padding[2];
 }ko_param;
 
 #pragma pack()
@@ -68,28 +69,80 @@ static volatile ko_param g_ko_param =
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 };
 
-
-#define CODE_MATCH(code, i) \
+#if defined(CONFIG_X86_64)
+#define PATCH_OP_POS1    3
+#define CODE_MATCH1(code, i) \
     (code[i] == 0x40 && code[i + 1] == 0x80 && code[i + 2] == 0xce && code[i + 3] == 0x80)
 
+#define PATCH_OP_POS2    1
+#define CODE_MATCH2(code, i) \
+    (code[i] == 0x0C && code[i + 1] == 0x80 && code[i + 2] == 0x89 && code[i + 3] == 0xC6)
+
+#elif defined(CONFIG_X86_32)
+#define PATCH_OP_POS1    2
+#define CODE_MATCH1(code, i) \
+    (code[i] == 0x80 && code[i + 1] == 0xca && code[i + 2] == 0x80 && code[i + 3] == 0xe8)
+
+#define PATCH_OP_POS2    2
+#define CODE_MATCH2(code, i) \
+    (code[i] == 0x80 && code[i + 1] == 0xca && code[i + 2] == 0x80 && code[i + 3] == 0xe8)
+
+#else
+#error "unsupported arch"
+#endif
+
 #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
+(
+    int style,
+    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);
+    vdebug("patch for %s style[%d] 0x%lx %d\n", desc, style, addr, (int)size);
 
     for (i = 0; i < (int)size - 4; i++)
     {
-        if (CODE_MATCH(opCode, i) && cnt < MAX_PATCH)
+        if (style == 1)
         {
-            patch[cnt] = opCode + i + 3;
-            cnt++;
+            if (CODE_MATCH1(opCode, i) && cnt < MAX_PATCH)
+            {
+                patch[cnt] = opCode + i + PATCH_OP_POS1;
+                cnt++;
+            }
+        }
+        else
+        {
+            if (CODE_MATCH2(opCode, i) && cnt < MAX_PATCH)
+            {
+                patch[cnt] = opCode + i + PATCH_OP_POS2;
+                cnt++;
+            }
         }
     }
 
@@ -139,7 +192,13 @@ 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(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("new 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)
     {
         rc = -EINVAL;
@@ -147,7 +206,7 @@ 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(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;
@@ -166,7 +225,15 @@ 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);