Changes between Version 15 and Version 16 of Dev/KernelHack/COINS/worklog/201111

Timestamp:

Nov 25, 2011 2:40:37 AM (13 years ago)

Author:

mitty

Comment:

--

Dev/KernelHack/COINS/worklog/201111

@@ -3450 +3450 @@
 d72eb4053f12de4c3c436663dd61679b20c156ac *blob.st
 }}}
+
+ == memset DATA ==
+ * s0711489@ubuntu-lucid64:~$ sudo insmod stackmod.ko
+ * s0711489@ubuntu-lucid64:~$ cat /sys/module/stackmod/sections/.text
+{{{
+0xffffffffa0068000
+}}}
+ * s0711489@ubuntu-lucid64:~$ cat /sys/module/stackmod/sections/.data
+{{{
+0xffffffffa0068738
+}}}
+ * s0711489@ubuntu-lucid64:~$ cat /sys/module/stackmod/sections/.bss
+{{{
+0xffffffffa0068970
+}}}
+
+ * gdb
+{{{
+(gdb) file vmlinux
+Reading symbols from /home/ugrad/07/s0711489/coursework/KernelHack/linux-2.6.35.14/x86_64/vmlinux...(no debugging symbols found)...done.
+(gdb) add-symbol-file ../../04/stackmod/stackmod.o 0xffffffffa0068000 -s .data 0xffffffffa0068738 -s .bss 0xffffffffa0068970
+add symbol table from file "../../04/stackmod/stackmod.o" at
+        .text_addr = 0xffffffffa0068000
+        .data_addr = 0xffffffffa0068738
+        .bss_addr = 0xffffffffa0068970
+(y or n) y
+Reading symbols from /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.o...done.
+(gdb) target remote localhost:8864
+Remote debugging using localhost:8864
+0xffffffff810097a9 in native_safe_halt ()
+    at /home/ugrad/07/s0711489/coursework/KernelHack/linux-2.6.35.14/x86_64/arch/x86/include/asm/irqflags.h:49
+49              asm volatile("sti; hlt": : :"memory");
+(gdb) b stackmod_proc_read
+Breakpoint 1 at 0xffffffffa00681cd: file /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c, line 153.
+(gdb) c
+Continuing.
+}}}
+
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 0
+}}}
+{{{
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "",
+    start=0xffff88001adbbe90, off=0, count=3072, eof=0xffff88001adbbe9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb) p stack
+$1 = {data = 0xffff88001b5fa000, depth = 0, errno = 0}
+(gdb) p entry
+$2 = 128
+(gdb) p stack.data[0]
+$3 = {length = 0, content = 0x0}
+(gdb) p stack.data[127]
+$4 = {length = 0, content = 0x0}
+(gdb) p stack.data[128]
+$5 = {length = 459255808, content = 0x0}
+(gdb) c
+Continuing.
+
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "stack: 0\n",
+    start=0xffff88001adbbe90, off=9, count=3072, eof=0xffff88001adbbe9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb) c
+Continuing.
+}}}
+
+ * s0711489@ubuntu-lucid64:~$ cat blob > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 10
+}}}
+{{{
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "stack: 0\n",
+    start=0xffff88001adbbe90, off=0, count=3072, eof=0xffff88001adbbe9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb) p stack
+$6 = {data = 0xffff88001b5fa000, depth = 10, errno = 0}
+(gdb) p stack.data[0]
+$7 = {length = 32768,
+  content = 0xffff88001b9e0000 "\315̦[\371t\021\252Ď\230\311\003\240f\222\206}\363oyy\\$\276\205\271l3\033;\215\215\231m\375B\005\027|]$\375-x\374@\227\205\262\320\371z\022\342Z\351\273/\234\214\034\331\020z C\345\004\023J\024?\232\262ë\357\266xa\274l%H\264ʿ,uZ\025\373\373@^q\226z\326k\276\a6\227\r\322B\035X\303Y\364\205#β\325\342\222\301%\311]\301TR\277e\242s\276m]>\346\001\327\027J]\325\065<\212\332\037\200QFtUԴ\223q;.Y/\017ٻj\313\264\246$\254v`\241بz!`i\255Ћ\245\360\346\065\252\343\315ĤN\034\364!\324'\002\001\321P"...}
+(gdb) p stack.data[8]
+$8 = {length = 32768,
+  content = 0xffff88001ac70000 "\377\352<e\275\025\343\"j\bc\021V\016\272\027h\244DYpo\347\215s\216\353\326\307\\\033\017\230:i}\024<n\342P\355\371\\\374\337j8\334M=m\276e\300\277dm\270SQ\\M\376\003\301\025&\203\325\034\r\361\355v\201o\303\034;M\206i\217\017w\365R\373\003+\242EN\037\327\375\353\004[\024.\f\255\234cb)\314qnR6\021\374\312\351b\252\035\232?OY\025Ǖ\347\ft\276\360\304g", <incomplete sequence \342>}
+(gdb) p stack.data[9]
+$9 = {length = 32768,
+  content = 0xffff88001ac68000 "\266,\361\t\361\366\345\352=\247k&Ce"}
+(gdb) p stack.data[10]
+$10 = {length = 0, content = 0x0}
+(gdb) p stack.data[11]
+$11 = {length = 0, content = 0x0}
+(gdb) c
+Continuing.
+
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "stack: 10\n",
+    start=0xffff88001adbbe90, off=10, count=3072, eof=0xffff88001adbbe9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb) c
+Continuing.
+}}}
+
+ * s0711489@ubuntu-lucid64:~$ cat /dev/stack > /dev/null
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 0
+}}}
+{{{
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "stack: 10\n",
+    start=0xffff88001b587e90, off=0, count=3072, eof=0xffff88001b587e9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb) p stack
+$12 = {data = 0xffff88001b5fa000, depth = 0, errno = 0}
+(gdb) p stack.data[0]
+$13 = {length = 0, content = 0x0}
+(gdb) p stack.data[9]
+$14 = {length = 0, content = 0x0}
+(gdb) p stack.data[10]
+$15 = {length = 0, content = 0x0}
+(gdb) c
+Continuing.
+
+Breakpoint 1, stackmod_proc_read (page=0xffff88001d9bd000 "stack: 0\n",
+    start=0xffff88001b587e90, off=9, count=3072, eof=0xffff88001b587e9c,
+    data=0x0)
+    at /home/ugrad/07/s0711489/coursework/KernelHack/04/stackmod/stackmod.c:153
+153     ) {
+(gdb)
+Continuing.
+}}}