Jim Huang
b50323330c
Merge pull request #19 from fennecJ/master
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Fix typo
2021-07-30 00:40:58 +08:00
fennecj
69b40b7bda
Fix typo
2021-07-29 19:52:22 +08:00
linD026
c7a7a667cf
Avoid strlen by assigning explicit length of string for proc_read ( #18 )
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Since the address of buffer is userspace address, it may trigger an unexpected fault on strlen(buffer).
On Ubuntu 20.04.2 LTS ( 5.8.0-63-generic ), using strlen(buffer) will result in the following:
[ 2168.010930] /proc/buffer1k created
[ 2177.014347] BUG: unable to handle page fault for address: 00007fbbc2a17000
[ 2177.014355] #PF: supervisor read access in kernel mode
[ 2177.014358] #PF: error_code(0x0000) - not-present page
[ 2177.014361] PGD 80000003c61d0067 P4D 80000003c61d0067 PUD 3ee6c5067 PMD 40e1ff067 PTE 0
[ 2177.014369] Oops: 0000 [#1 ] SMP PTI
[ 2177.014376] CPU: 7 PID: 4750 Comm: cat Tainted: P W OE 5.8.0-63-generic #71~20.04.1-Ubuntu
[ 2177.014387] RIP: 0010:procfile_read+0xb/0x20 [procfs2]
[ 2177.014393] Code: Unable to access opcode bytes at RIP 0xffffffffc1253fe1.
[ 2177.014396] RSP: 0018:ffffbc84412cbe78 EFLAGS: 00010286
[ 2177.014400] RAX: ffffffffc1254000 RBX: 0000000000020000 RCX: ffffbc84412cbef0
[ 2177.014403] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: ffffa057d2708f00
[ 2177.014406] RBP: ffffbc84412cbe80 R08: 0000000000000001 R09: 0000000000000000
[ 2177.014409] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0581de8ccc0
[ 2177.014411] R13: ffffa057d2708f00 R14: ffffbc84412cbef0 R15: 00007fbbc2a17000
[ 2177.014415] FS: 00007fbbc3bfa580(0000) GS:ffffa0582dbc0000(0000) knlGS:0000000000000000
[ 2177.014418] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2177.014421] CR2: ffffffffc1253fe1 CR3: 00000003c611c004 CR4: 00000000003606e0
[ 2177.014424] Call Trace:
[ 2177.014435] proc_reg_read+0x66/0x90
[ 2177.014441] vfs_read+0xaa/0x190
[ 2177.014446] ksys_read+0x67/0xe0
[ 2177.014451] __x64_sys_read+0x1a/0x20
[ 2177.014458] do_syscall_64+0x49/0xc0
[ 2177.014464] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2177.014467] RIP: 0033:0x7fbbc3b18142
[ 2177.014472] Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24
[ 2177.014476] RSP: 002b:00007ffcf2d20d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 2177.014479] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007fbbc3b18142
[ 2177.014482] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: 0000000000000003
[ 2177.014485] RBP: 00007fbbc2a17000 R08: 00007fbbc2a16010 R09: 0000000000000000
[ 2177.014487] R10: 0000000000000022 R11: 0000000000000246 R12: 0000560f8ff081f0
[ 2177.014490] R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000
[ 2177.014635] CR2: 00007fbbc2a17000
[ 2177.014639] ---[ end trace b71ff05c1b0a10f6 ]---
[ 2177.184174] RIP: 0010:procfile_read+0xb/0x20 [procfs2]
[ 2177.184176] Code: Unable to access opcode bytes at RIP 0xffffffffc1253fe1.
[ 2177.184177] RSP: 0018:ffffbc84412cbe78 EFLAGS: 00010286
[ 2177.184178] RAX: ffffffffc1254000 RBX: 0000000000020000 RCX: ffffbc84412cbef0
[ 2177.184179] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: ffffa057d2708f00
[ 2177.184180] RBP: ffffbc84412cbe80 R08: 0000000000000001 R09: 0000000000000000
[ 2177.184180] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0581de8ccc0
[ 2177.184181] R13: ffffa057d2708f00 R14: ffffbc84412cbef0 R15: 00007fbbc2a17000
[ 2177.184182] FS: 00007fbbc3bfa580(0000) GS:ffffa0582dbc0000(0000) knlGS:0000000000000000
[ 2177.184182] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2177.184183] CR2: ffffffffc1253fe1 CR3: 00000003c611c004 CR4: 00000000003606e0
2021-07-29 16:10:52 +08:00
Jim Huang
a82cf74c15
Open Software License is not popular. Explicitly refer to OSI
2021-07-27 10:10:16 +08:00
2011eric
d0f604fc26
Use unified command prompt ( #11 )
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This patch enforces the assumption of using as a non-root user. That is,
it is necessary to specify sudo for the essential commands such as
insmod and rmmod. In addition, most command prompts should start with
$ (dollar sign).
2021-07-26 13:10:34 +08:00
Jim Huang
cb5ae95673
Merge pull request #12 from 25077667/style-tweaks
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Fix trivial tweak for missing comma
2021-07-26 03:18:06 +08:00
25077667
00f7e7018f
Fix trivial tweak for missing comma
2021-07-26 03:08:27 +08:00
Jim Huang
65a8c123e4
Tidy section: hello world
2021-07-26 01:46:26 +08:00
Wei-Lun Tsai
ddcbb69fa3
Trivial fix for writing style
2021-07-24 09:14:46 +08:00
Jim Huang
1e3c1b8a76
Apply trivial tweak
2021-07-23 14:36:26 +08:00
Jim Huang
40ae17c1f8
Merge pull request #2 from 25077667/master
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Redraw figure: seq_file
2021-07-23 14:33:30 +08:00
Jim Huang
78ca9884de
Merge pull request #3 from ekangmonyet/minor-fixes
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Typo at 0.7.3 Manage /proc file with seq_file
2021-07-23 14:31:18 +08:00
Jim Huang
75356dbe43
Tidy section: hello world
2021-07-23 14:30:09 +08:00
Jim Huang
9b05bf44dd
Tweak wording
2021-07-23 14:05:52 +08:00
Jim Huang
58e55d03d0
Tidy section: headers
2021-07-23 14:02:27 +08:00
Jim Huang
f7f46f145d
Tidy section: introduction
2021-07-23 13:56:51 +08:00
Ekang Monyet
121d816282
Typo at 0.7.3 Manage /proc file with seq_file
2021-07-23 11:07:17 +08:00
25077667
245ac0298e
Use TikZ to re-draw seq_file graph
2021-07-23 02:10:57 +08:00
Jim Huang
35ac926de5
Remove unused packages
2021-07-22 20:47:48 +08:00
Jim Huang
faf3aa7c22
Make each source file more consistent
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It is vital to denote the file name and summary for each source,
otherwise readers could not figure out the corresponding files.
2021-07-22 11:25:32 +08:00
Jim Huang
1c93f2f5ef
Shorten sample code
2021-07-22 10:55:14 +08:00
Jim Huang
52dfb6744d
Use American English words
2021-07-22 10:54:24 +08:00
Jim Huang
2e30e181f8
Drop duplicated copyright notice
2021-07-22 10:53:45 +08:00
Jim Huang
b76e5d378e
Reduce header inclusion
2021-07-22 10:31:24 +08:00
Jim Huang
08e7b6efc3
Emphasize on 5.x kernel
2021-07-22 08:31:47 +08:00
Jim Huang
60856826f0
Exclude the files generated by Linux kernel build system
2021-07-22 08:09:20 +08:00
Jim Huang
d8812d2d9a
Revise the authorship
2021-07-22 07:39:35 +08:00
Jim Huang
675c002b15
Remove linux-2.6 specific checks
2021-07-22 07:33:27 +08:00
Jim Huang
760bbe70cb
Drop duplicated module author information
2021-07-22 07:29:07 +08:00
Jim Huang
64f791f274
Improve the compatibility with kernel version < 5.6
2021-07-22 07:17:31 +08:00
Jim Huang
50b8dfe6c2
Enforce the customized style for example code
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Instead of using tab for indention, the style defaults to 4 spaces for
the sake of compact layout.
2021-07-22 06:58:13 +08:00
Jim Huang
936d82fad7
Emphasize on the license terms
2021-07-22 06:39:22 +08:00
Jim Huang
2246e20809
Add LaTeX script and sample code
2021-07-22 06:35:24 +08:00
Jim Huang
826b45b3d9
Initial import
2021-07-22 06:34:19 +08:00
