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Author SHA1 Message Date
Jim Huang
6110f8ee3c Rewrite the descriptions about bottom half 2021-09-01 12:07:25 +08:00
Jim Huang
5b953eea75
Merge pull request #86 from linD026/master 
Fix typo
 2021-09-01 09:44:45 +08:00
linzhien
5cd96a80c9 Fix typo 2021-09-01 07:44:40 +08:00
fennecJ
0e11c00e1b
Add GitHub buttons in rendered HTML (#85) 
GitHub buttons are rendered in the generated HTML:
one is GitHub project page; another is PDF download.

Close #84
 2021-08-31 23:49:18 +08:00
linD026
cccc98ab2c
Fix disallowed cr0 write protection and close_fd (#80) 
Since the commit 8dbec27a242cd3e2816eeb98d3237b9f57cf6232 [1]
(kernel version v5.3+ [2]) the sensitive CR0 bits in x86 is pinned,
we need to use the inline asm [3][4] to bypass it.

commit 8dbec27a242cd3e2816eeb98d3237b9f57cf6232 :
> With sensitive CR4 bits pinned now, it's possible that the WP bit for
> CR0 might become a target as well.
>
> Following the same reasoning for the CR4 pinning, pin CR0's WP
> bit. Contrary to the cpu feature dependend CR4 pinning this can be done
> with a constant value.

Also, getting "sys_call_table" [8] from the symbol lookup by using the address
of "close_fd" does not work for v5.11+ [5][6]. The reason is the entry of
"sys_call_table[__NR_close]" is not the address of "close_fd", actually
it is "__x64_sys_close" in x86.

Two solutions were proposed: using "kallsyms_lookup_name" [7] or just specifying
the address into the module. The symbol "kallsyms_lookup_name"  is unexported
since v5.7; the address of "sys_call_table" can be found in
"/boot/System.map" or "/proc/kallsyms".

Since v5.7, the manual symbol lookup is not guaranteed to work
because of control-flow integrity (or control-flow enforcement [9][10]) is added
[11] for x86, but it is disabled since v5.11 [12][13]. To make sure manual symbol
lookup work, it only uses up to v5.4.

Reference:
[1] 8dbec27a24
[2] https://outflux.net/blog/archives/2019/11/14/security-things-in-linux-v5-3/
[3] https://patchwork.kernel.org/project/linux-kbuild/patch/20200903203053.3411268-3-samitolvanen@google.com/
[4] https://stackoverflow.com/questions/58512430/how-to-write-to-protected-pages-in-the-linux-kernel
[5] https://lore.kernel.org/bpf/20201120231441.29911-21-ebiederm@xmission.com/
[6] https://lore.kernel.org/bpf/87blj83ysq.fsf@x220.int.ebiederm.org/
[7] 0bd476e6c6
[8] 8f27766a88
[9] https://lore.kernel.org/lkml/20200204171425.28073-1-yu-cheng.yu@intel.com/
[10] https://lore.kernel.org/linux-doc/20201110162211.9207-1-yu-cheng.yu@intel.com/T/
[11] 5790921bc1
[12] 20bf2b3787
[13] https://lore.kernel.org/bpf/20210128123842.c9e33949e62f504b84bfadf5@gmail.com/
 2021-08-31 11:07:01 +08:00
Jim Huang
d3bde7daed print_string: Validate tty before accessing its operations 
Close #81
 2021-08-30 01:41:57 +08:00
Jim Huang
b990049715
Merge pull request #79 from xatier/patch-1 
Update Arch Linux kernel headers information
 2021-08-26 11:14:11 +08:00
xatier
1f9f201940
Update Archlinux kernel headers instructions 
`linux-libre-headers` has been moved to AUR [1]. We can simply install `linux-headers` [2] instead.

[1] https://aur.archlinux.org/packages/linux-libre-headers/
[2] https://archlinux.org/packages/core/x86_64/linux-headers/
 2021-08-25 20:11:27 -07:00
linD026
06b75942cc
Fix incorrect major number registration in chardev (#77) 
chardev2.c demonstrates the ioctl operation with static major
number MAJOR_NUM, but there also exists "Major," the dynamic
one, which results in registration and deregistration on different
device. Once the module remove, it cannot insert again:

  $ sudo insmod chardev2.ko
  $ sudo rmmod chardev2
  $ cat /proc/devices
  Character devices:
  ...
  100 char_dev
  $ sudo insmod chardev2.ko
  insmod: ERROR: could not insert module chardev2.ko: Device or resource busy

This patch removed the use of dynamic major number.
 2021-08-26 03:16:17 +08:00
Jim Huang
c97348d2d5
Merge pull request #75 from tuckerpo/fix/errno_assignment 
Fix: errno assignment should be comparison.
 2021-08-24 23:22:32 +08:00
Tucker Polomik
a183cc72f0 Fix: errno assignment should be comparison. 2021-08-24 11:16:25 -04:00
Jim Huang
ecfe9606de Get rid of the initial 0 that shows up in every (sub)section 
Every section and subsection number can be eliminated by adding the
renewcommand.

Suggested by Lars Engebretsen.
 2021-08-24 19:02:16 +08:00
Jim Huang
9d39f658c7
Merge pull request #74 from brdbkr/master 
Fixed typo
 2021-08-24 14:08:24 +08:00
Brad Baker
8012508508 Fixing typo 2021-08-24 00:15:47 -04:00
Jim Huang
fe3db9f939
Merge pull request #70 from fennecJ/patch 
Adapt recent kernel changes
 2021-08-24 03:41:14 +08:00
fennecJ
870b26fa2d Update several example code for newer kernel 
Known issues with current example code:
If you using newer kernel(e.g linux 5.11.x) to compile the example code,
you may meet following error:
1. syscall.c:83:50: error: ‘ksys_close’ undeclared;
2. cryptosk.c:17:24: error: field ‘sg’ has incomplete type
3. cryptosk.c:143:9: error: implicit declaration of function
‘get_random_bytes’
4. error: macro "DECLARE_TASKLET" passed 3 arguments, but takes just 2

Solutions/workaround:
1. In syscall.c, replace #include <linux/syscalls.h> with
#include <linux/fdtable.h> and replace  ksys_close with close_fd
if the kernel version >= 5.11. [1][2]
2. Add #include <linux/scatterlist.h> into cryptosk.c
3. Add #include <linux/random.h> into cryptosk.c
4. In bottomhalf.c and example_tasklet.c, replace DECLARE_TASKLET
with DECLARE_TASKLET_OLD and dispose third argument(0L). [3]

[1] - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1572bfdf21d4d50e51941498ffe0b56c2289f783
[2] - https://www.mail-archive.com/meta-arago@arago-project.org//msg11939.html
[3] - https://patchwork.kernel.org/project/kernel-hardening/patch/20200716030847.1564131-3-keescook@chromium.org/
 2021-08-23 21:30:43 +08:00
Jim Huang
bd8342bc14
Merge pull request #69 from gagachang/master 
Update path to kernel v5.x
 2021-08-21 19:27:08 +08:00
gagachang
9827e32e4d Update some file path to kernel v5.x+ in example/kbleds.c 
1. drivers/char/vt_ioctl.c -> drivers/tty/vt/vt_ioctl.c
2. drivers/char/keyboard.c -> drivers/tty/vt/keyboard.c
 2021-08-21 14:51:37 +08:00
Jim Huang
22e50f3ce9 Use recent kernel build messages 2021-08-20 01:05:51 +08:00
Jim Huang
f7e2186e6b Revise the version magic descriptions for recent kernels 2021-08-20 01:02:20 +08:00
Jim Huang
3c742b0c7c Fix wording 2021-08-20 00:29:43 +08:00
Jim Huang
e47258cd19 Neither latexmk nor dvipng is required 
The package texlive-bin from extra also contains a dvipng binary.

Close #58
 2021-08-18 20:43:51 +08:00
Jim Huang
9a19fde915
Merge pull request #67 from fennecJ/master 
Add pdf download link in html only
 2021-08-17 17:37:08 +08:00
fennecj
fe8dd00e2c Add PDF download link in html only 
Close #64
 2021-08-17 17:35:36 +08:00
Jim Huang
2db805da2c Check coding style in CI 2021-08-17 13:07:06 +08:00
Jim Huang
48cb100473
Merge pull request #66 from CyrilBrulebois/master 
Proofreading and small improvements
 2021-08-17 08:56:55 +08:00
Cyril Brulebois
98aa78e4d2 Adjust link to ioctl-number.rst 2021-08-16 21:54:03 +02:00
Cyril Brulebois
c43c01db31 Improve wording (avoid a send/sent repetition along the way) 2021-08-16 21:54:03 +02:00
Cyril Brulebois
08b6de2cde Use an https:// link for LWN 2021-08-16 21:54:03 +02:00
Cyril Brulebois
8861d1ead7 Improve wording (statistics seem gathered, not stat-ed) 2021-08-16 21:54:03 +02:00
Cyril Brulebois
4d5649fc08 Improve wording (there's only one kernel) 2021-08-16 21:54:03 +02:00
Cyril Brulebois
3e05439b6d Add emphasis for the y/m values 2021-08-16 21:54:03 +02:00
Cyril Brulebois
b5ab7c5e88 Fix various typos 2021-08-16 21:54:03 +02:00
Cyril Brulebois
d85944d107 Mention pr_info() rather than KERN_INFO 
The latter might have been used along with printk() in an earlier
version, but pr_info() is getting used consistently so adjust the
#include comments accordingly.

For the avoidance of doubt, pr_info() actually comes from printk.h,
which gets #include'd by kernel.h.
 2021-08-16 21:53:22 +02:00
fennecJ
467cc83cc7
Improve the descriptions about reference count (#62) 
The term "reference count" would be better than "use count."
In addition, the usage of module_refcount(THIS_MODULE) was appended
for the reference counter query.
 2021-08-17 00:23:22 +08:00
Jim Huang
53d071eb16
Merge pull request #63 from fennecJ/patch2 
Fix typo
 2021-08-17 00:11:37 +08:00
fennecj
99faf5ed0f Fix typo 2021-08-16 23:48:04 +08:00
Jim Huang
4acc65b740 Use \verb for the identifiers starting with "--" 2021-08-16 21:21:10 +08:00
Jim Huang
b497b6a34e Remove never implemented MODULE_SUPPORTED_DEVICE 
MODULE_SUPPORTED_DEVICE is remove from upstream since March 17, 2021.
See linux.git commit 6417f03

Reported by Niklas Lantau <niklaslantau@gmail.com>
Close #61
 2021-08-16 20:19:35 +08:00
Chih-Yu Chen
c8238430b2
Avoid incorrectly separated words (#55) 
This patch fixed some typos and added the missing punctuation.
 2021-08-16 18:45:43 +08:00
Jim Huang
fd69ad9d05
Merge pull request #60 from fennecJ/patch 
Fix grammar and typo
 2021-08-16 17:24:26 +08:00
fennecj
15e44bffa8 Fix grammar and typo 2021-08-16 00:47:23 +08:00
Jim Huang
964f14dda6 Annotate more directories/files 2021-08-13 01:02:21 +08:00
Jim Huang
4c137c305c
Merge pull request #57 from fennecJ/patch 
Fix typo
 2021-08-13 00:53:24 +08:00
fennecj
990358d75a Fix typo 2021-08-13 00:52:33 +08:00
Jim Huang
1da7086da0
Merge pull request #56 from bbenno/fix/typo 
Fix typo: concurent -> concurrent
 2021-08-13 00:28:37 +08:00
Benno Bielmeier
8ba0b0085d
Fix typo: concurent -> concurrent 2021-08-12 07:43:38 +00:00
Jim Huang
f426661923
Merge pull request #54 from fennecJ/patch 
Fix typo
 2021-08-11 21:01:07 +08:00
fennecj
b656755300 Fix typo 2021-08-11 18:34:23 +08:00
Jim Huang
8d7caa7fc9 Make insmod/rmmod more consistent 2021-08-11 15:08:08 +08:00