Changes between Version 14 and Version 15 of Dev/KernelHack/COINS/worklog/201111

Timestamp:

Nov 25, 2011 2:34:38 AM (12 years ago)

Author:

mitty

Comment:

--

Dev/KernelHack/COINS/worklog/201111

@@ -3338 +3338 @@
 Continuing.
 }}}
+
+ == stackmod seems to work as expected ==
+ * s0711489@ubuntu-lucid64:~$ sudo insmod stackmod.ko entry=4
+ * s0711489@ubuntu-lucid64:~$ sudo mknod /dev/stack c 251 0
+ * s0711489@ubuntu-lucid64:~$ sudo chmod 666 /dev/stack
+
+ * s0711489@ubuntu-lucid64:~$ echo 0 > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ echo 1 > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ echo 2 > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ echo 3 > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 4
+}}}
+ * s0711489@ubuntu-lucid64:~$ echo 4 > /dev/stack
+{{{
+-bash: echo: write error: No space left on device
+}}}
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 4
+}}}
+ * s0711489@ubuntu-lucid64:~$ cat /dev/stack
+{{{
+3
+2
+1
+0
+}}}
+ * s0711489@ubuntu-lucid64:~$ cat /proc/stackmod
+{{{
+stack: 0
+}}}
+
+ * s0711489@ubuntu-lucid64:~$ tailf /var/log/kern.log
+{{{
+Nov 23 20:03:55 ubuntu-lucid64 kernel: [   34.772987] stackmod is loaded
+Nov 23 20:03:55 ubuntu-lucid64 kernel: [   34.772992] stackmod: 4 entry, major is 251, minor is 0
+Nov 23 20:03:55 ubuntu-lucid64 kernel: [   34.773002] stackmod: create /proc/stackmod
+Nov 23 20:03:55 ubuntu-lucid64 kernel: [   34.773004] stackmod is added successfully
+Nov 23 20:05:02 ubuntu-lucid64 kernel: [  101.487336] stackmod is opened
+Nov 23 20:05:02 ubuntu-lucid64 kernel: [  101.487361] stackmod is written (2)
+Nov 23 20:05:02 ubuntu-lucid64 kernel: [  101.487367] stackmod is released
+Nov 23 20:05:05 ubuntu-lucid64 kernel: [  104.420526] stackmod is opened
+Nov 23 20:05:05 ubuntu-lucid64 kernel: [  104.420537] stackmod is written (2)
+Nov 23 20:05:05 ubuntu-lucid64 kernel: [  104.420542] stackmod is released
+Nov 23 20:05:08 ubuntu-lucid64 kernel: [  107.535829] stackmod is opened
+Nov 23 20:05:08 ubuntu-lucid64 kernel: [  107.535844] stackmod is written (2)
+Nov 23 20:05:08 ubuntu-lucid64 kernel: [  107.535849] stackmod is released
+Nov 23 20:05:11 ubuntu-lucid64 kernel: [  110.279177] stackmod is opened
+Nov 23 20:05:11 ubuntu-lucid64 kernel: [  110.279192] stackmod is written (2)
+Nov 23 20:05:11 ubuntu-lucid64 kernel: [  110.279198] stackmod is released
+Nov 23 20:05:16 ubuntu-lucid64 kernel: [  115.426012] /proc/stackmod is read
+Nov 23 20:05:16 ubuntu-lucid64 kernel: [  115.426026] /proc/stackmod is read
+Nov 23 20:05:21 ubuntu-lucid64 kernel: [  120.354789] stackmod is opened
+Nov 23 20:05:21 ubuntu-lucid64 kernel: [  120.354804] stackmod is written (2)
+Nov 23 20:05:21 ubuntu-lucid64 kernel: [  120.354989] stackmod is released
+Nov 23 20:05:25 ubuntu-lucid64 kernel: [  124.989666] /proc/stackmod is read
+Nov 23 20:05:25 ubuntu-lucid64 kernel: [  124.989681] /proc/stackmod is read
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278525] stackmod is opened
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278792] stackmod is read (32768)
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278802] stackmod is read (32768)
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278806] stackmod is read (32768)
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278810] stackmod is read (32768)
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278813] stackmod is read (32768)
+Nov 23 20:05:34 ubuntu-lucid64 kernel: [  133.278817] stackmod is released
+Nov 23 20:05:37 ubuntu-lucid64 kernel: [  136.451935] /proc/stackmod is read
+Nov 23 20:05:37 ubuntu-lucid64 kernel: [  136.451949] /proc/stackmod is read
+}}}
+
+ === test with binary data ===
+ ==== within 1 stack ====
+ * s0711489@ubuntu-lucid64:~$ dd if=/dev/urandom of=10kb count=10 bs=1024
+ * s0711489@ubuntu-lucid64:~$ cat 10kb > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ cat /dev/stack > 10kb.st
+ * s0711489@ubuntu-lucid64:~$ ls -l
+{{{
+total 156
+-rw-r--r-- 1 s0711489 s0711489  10240 2011-11-23 20:13 10kb
+-rw-r--r-- 1 s0711489 s0711489  10240 2011-11-23 20:15 10kb.st
+-rw-r--r-- 1 s0711489 s0711489 128105 2011-11-23 20:03 stackmod.ko
+}}}
+ * s0711489@ubuntu-lucid64:~$ sha1sum -b 10kb*
+{{{
+8cc43464af331cd5d56f1db7d44b59530e038ec8 *10kb
+8cc43464af331cd5d56f1db7d44b59530e038ec8 *10kb.st
+}}}
+
+ * s0711489@ubuntu-lucid64:~$ tailf /var/log/kern.log
+{{{
+Nov 23 20:14:18 ubuntu-lucid64 kernel: [  657.018652] stackmod is opened
+Nov 23 20:14:18 ubuntu-lucid64 kernel: [  657.020744] stackmod is written (10240)
+Nov 23 20:14:18 ubuntu-lucid64 kernel: [  657.020767] stackmod is released
+Nov 23 20:15:05 ubuntu-lucid64 kernel: [  704.792196] stackmod is opened
+Nov 23 20:15:05 ubuntu-lucid64 kernel: [  704.792212] stackmod is read (32768)
+Nov 23 20:15:05 ubuntu-lucid64 kernel: [  704.792275] stackmod is read (32768)
+Nov 23 20:15:05 ubuntu-lucid64 kernel: [  704.792279] stackmod is released
+}}}
+
+ ==== more than one stack ====
+ * s0711489@ubuntu-lucid64:~$ dd if=/dev/urandom of=blob count=10 bs=32768
+ * s0711489@ubuntu-lucid64:~$ sudo insmod stackmod.ko entry=10
+ * s0711489@ubuntu-lucid64:~$ cat blob > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ cat /dev/stack > blob.rev
+ * s0711489@ubuntu-lucid64:~$ cat blob.rev > /dev/stack
+ * s0711489@ubuntu-lucid64:~$ cat /dev/stack > blob.st
+ * s0711489@ubuntu-lucid64:~$ sha1sum -b blob*
+{{{
+d72eb4053f12de4c3c436663dd61679b20c156ac *blob
+2366d2d5b3c62a647c7eb28ae6708caf064470f4 *blob.rev
+d72eb4053f12de4c3c436663dd61679b20c156ac *blob.st
+}}}