1 #!/bin/bash
2
3 db_file=$1
4 cat << EOF | sqlite3 $db_file
5 /* we only care about the main ->read/write() functions. */
6 delete from caller_info where function = '(struct file_operations)->read' and file != 'fs/read_write.c';
7 delete from caller_info where function = '(struct file_operations)->write' and file != 'fs/read_write.c';
8 delete from caller_info where function = '(struct file_operations)->read' and caller != '__vfs_read';
9 delete from caller_info where function = '(struct file_operations)->write' and caller != '__vfs_write';
10 delete from function_ptr where function = '(struct file_operations)->read';
11 delete from function_ptr where function = '(struct file_operations)->write';
12 delete from caller_info where function = '__vfs_write' and caller != 'vfs_write';
13 delete from caller_info where function = '__vfs_read' and caller != 'vfs_read';
14 delete from caller_info where function = '(struct file_operations)->write' and caller = 'do_loop_readv_writev';
15 delete from caller_info where function = 'do_splice_from' and caller = 'direct_splice_actor';
16
17 /* delete these function pointers which cause false positives */
18 delete from caller_info where function = '(struct file_operations)->open' and type != 0;
19 delete from caller_info where function = '(struct notifier_block)->notifier_call' and type != 0;
20 delete from caller_info where function = '(struct mISDNchannel)->send' and type != 0;
21 delete from caller_info where function = '(struct irq_router)->get' and type != 0;
22 delete from caller_info where function = '(struct irq_router)->set' and type != 0;
23 delete from caller_info where function = '(struct net_device_ops)->ndo_change_mtu' and caller = 'i40e_dbg_netdev_ops_write';
24 delete from caller_info where function = '(struct timer_list)->function' and type != 0;
25
26 /* 8017 is USER_DATA and 9017 is USER_DATA_SET */
27 delete from caller_info where function = 'dev_hard_start_xmit' and type = 8017;
28 delete from return_states where function='vscnprintf' and type = 9017;
29 delete from return_states where function='scnprintf' and type = 9017;
30 delete from return_states where function='vsnprintf' and type = 9017;
31 delete from return_states where function='snprintf' and type = 9017;
32 delete from return_states where function='sprintf' and type = 9017;
33 delete from return_states where function='vscnprintf' and type = 8017;
34 delete from return_states where function='scnprintf' and type = 8017;
35 delete from return_states where function='vsnprintf' and type = 8017;
36 delete from return_states where function='snprintf' and type = 8017;
37 delete from return_states where function='sprintf' and type = 8017;
38 /* There is something setting skb->sk->sk_mark and friends to user_data and */
39 /* because of recursion it gets passed to everything and is impossible to debug */
40 delete from caller_info where function = '__dev_queue_xmit' and type = 8017;
41 delete from caller_info where function = '__netdev_start_xmit' and type = 8017;
42 delete from caller_info where function = '(struct packet_type)->func' and type = 8017;
43 delete from caller_info where function = '(struct bio)->bi_end_io' and type = 8017;
44 delete from caller_info where caller = 'NF_HOOK_COND' and type = 8017;
45 delete from caller_info where caller = 'NF_HOOK' and type = 8017;
46 /* comparison doesn't deal with chunks, I guess. */
47 delete from return_states where function='get_tty_driver' and type = 8017;
48 delete from caller_info where caller = 'snd_ctl_elem_write' and function = '(struct snd_kcontrol)->put' and type = 8017;
49 delete from caller_info where caller = 'snd_ctl_elem_read' and function = '(struct snd_kcontrol)->get' and type = 8017;
50 delete from caller_info where function = 'nf_tables_newexpr' and type = 8017 and key = '\$->family';
51 delete from caller_info where caller = 'fb_set_var' and function = '(struct fb_ops)->fb_set_par' and type = 8017 and parameter = 0;
52 delete from return_states where function = 'tty_lookup_driver' and parameter = 2 and type = 8017;
53
54 insert into caller_info values ('userspace', '', 'compat_sys_ioctl', 0, 0, 8017, 0, '\$', '1');
55 insert into caller_info values ('userspace', '', 'compat_sys_ioctl', 0, 0, 8017, 1, '\$', '1');
56 insert into caller_info values ('userspace', '', 'compat_sys_ioctl', 0, 0, 8017, 2, '\$', '1');
57
58 delete from caller_info where function = '(struct timer_list)->function' and parameter = 0;
59
60 /*
61 * rw_verify_area is a very central function for the kernel. The 1000000000
62 * isn't accurate but I've picked it so that we can add "pos + count" without
63 * wrapping on 32 bits.
64 */
65 delete from return_states where function = 'rw_verify_area';
66 insert into return_states values ('faked', 'rw_verify_area', 0, 1, '0-1000000000[<=\$3]', 0, 0, -1, '', '');
67 insert into return_states values ('faked', 'rw_verify_area', 0, 1, '0-1000000000[<=\$3]', 0, 104, 2, '*\$', '0-1000000000');
68 insert into return_states values ('faked', 'rw_verify_area', 0, 1, '0-1000000000[<=\$3]', 0, 103, 3, '\$', '0-1000000000');
69 insert into return_states values ('faked', 'rw_verify_area', 0, 2, '(-4095)-(-1)', 0, 0, -1, '', '');
70
71 delete from return_states where function = 'is_kernel_rodata';
72 insert into return_states values ('faked', 'is_kernel_rodata', 0, 1, '1', 0, 0, -1, '', '');
73 insert into return_states values ('faked', 'is_kernel_rodata', 0, 1, '1', 0, 103, 0, '\$', '4096-ptr_max');
74 insert into return_states values ('faked', 'is_kernel_rodata', 0, 2, '0', 0, 0, -1, '', '');
75
76 /*
77 * Other kmalloc hacking.
78 */
79 delete from return_states where function = 'vmalloc';
80 insert into return_states values ('faked', 'vmalloc', 0, 1, '4096-ptr_max', 0, 0, -1, '', '');
81 insert into return_states values ('faked', 'vmalloc', 0, 1, '4096-ptr_max', 0, 103, 0, '\$', '1-128000000');
82 insert into return_states values ('faked', 'vmalloc', 0, 2, '0', 0, 0, -1, '', '');
83
84 delete from return_states where function = 'ksize';
85 insert into return_states values ('faked', 'ksize', 0, 1, '0', 0, 0, -1, '', '');
86 insert into return_states values ('faked', 'ksize', 0, 1, '0', 0, 103, 0, '\$', '16');
87 insert into return_states values ('faked', 'ksize', 0, 2, '1-4000000', 0, 0, -1, '', '');
88
89 /* store a bunch of capped functions */
90 update return_states set return = '0-u32max[<=\$2]' where function = 'copy_to_user';
91 update return_states set return = '0-u32max[<=\$2]' where function = '_copy_to_user';
92 update return_states set return = '0-u32max[<=\$2]' where function = '__copy_to_user';
93 update return_states set return = '0-u32max[<=\$2]' where function = 'copy_from_user';
94 update return_states set return = '0-u32max[<=\$2]' where function = '_copy_from_user';
95 update return_states set return = '0-u32max[<=\$2]' where function = '__copy_from_user';
96
97 update return_states set return = '0-8' where function = '__arch_hweight8';
98 update return_states set return = '0-16' where function = '__arch_hweight16';
99 update return_states set return = '0-32' where function = '__arch_hweight32';
100 update return_states set return = '0-64' where function = '__arch_hweight64';
101
102 /*
103 * Preserve the value across byte swapping. By the time we use it for math it
104 * will be byte swapped back to CPU endian.
105 */
106 update return_states set return = '0-u64max[==\$0]' where function = '__fswab64';
107 update return_states set return = '0-u32max[==\$0]' where function = '__fswab32';
108 update return_states set return = '0-u16max[==\$0]' where function = '__fswab16';
109 update return_states set return = '0-u64max[==\$0]' where function = '__builtin_bswap64';
110 update return_states set return = '0-u32max[==\$0]' where function = '__builtin_bswap32';
111 update return_states set return = '0-u16max[==\$0]' where function = '__builtin_bswap16';
112
113 delete from return_states where function = 'bitmap_allocate_region' and return = '1';
114 /* Just delete a lot of returns that everyone ignores */
115 delete from return_states where file = 'drivers/pci/access.c' and (return >= 129 and return <= 137);
116
117 /* Smatch can't parse wait_for_completion() */
118 update return_states set return = '(-108),(-22),0' where function = '__spi_sync' and return = '(-115),(-108),(-22)';
119
120 delete from caller_info where caller = '__kernel_write';
121
122 /* We sometimes use pre-allocated 4097 byte buffers for performance critical code but pretend it is always PAGE_SIZE */
123 update caller_info set value = 4096 where caller='kernfs_file_direct_read' and function='(struct kernfs_ops)->read' and type = 1002 and parameter = 1;
124 /* let's pretend firewire doesn't exist */
125 delete from caller_info where caller='init_fw_attribute_group' and function='(struct device_attribute)->show';
126 /* and let's fake the next dev_attr_show() call entirely */
127 delete from caller_info where caller='sysfs_kf_seq_show' and function='(struct sysfs_ops)->show';
128 insert into caller_info values ('fake', 'sysfs_kf_seq_show', '(struct sysfs_ops)->show', 0, 0, 1001, 0, '\$', '4096-ptr_max');
129 insert into caller_info values ('fake', 'sysfs_kf_seq_show', '(struct sysfs_ops)->show', 0, 0, 1002, 2, '\$', '4096');
130 insert into caller_info values ('fake', 'sysfs_kf_seq_show', '(struct sysfs_ops)->show', 0, 0, 1001, 2, '\$', '4096-ptr_max');
131 insert into caller_info values ('fake', 'sysfs_kf_seq_show', '(struct sysfs_ops)->show', 0, 0, 0, -1, '' , '');
132 /* config fs confuses smatch a little */
133 update caller_info set value = 4096 where caller='fill_read_buffer' and function='(struct configfs_item_operations)->show_attribute' and type = 1002 and parameter = 2;
134
135 /* smatch sees the memset() but not the subsequent changes */
136 update return_states set value = "" where function = 'gfs2_ea_find' and return = '0' and type = 101 and parameter = 3;
137
138 delete from type_value where type = '(struct fd)->file';
139 delete from type_value where type = '(struct fd)->flags';
140
141 /* This is sometimes an enum or a u64 */
142 delete from type_value where type = '(struct mc_cmd_header)->status';
143
144 /* this is handled in check_kernel.c */
145 delete from return_states where function = "__write_once_size";
146
147 update return_states set value = "s32min-s32max[\$1]" where function = 'atomic_set' and parameter = 0 and type = 1025;
148
149 /* handled in the check itself */
150 delete from return_states where function = 'atomic_inc_return' and (type = 8023 or type = 8024);
151 delete from return_states where function = 'atomic_add_return' and (type = 8023 or type = 8024);
152 delete from return_states where function = 'atomic_sub_return' and (type = 8023 or type = 8024);
153 delete from return_states where function = 'atomic_sub_and_test' and (type = 8023 or type = 8024);
154 delete from return_states where function = 'atomic_dec_and_test' and (type = 8023 or type = 8024);
155 delete from return_states where function = 'atomic_dec' and (type = 8023 or type = 8024);
156 delete from return_states where function = 'atomic_inc' and (type = 8023 or type = 8024);
157 delete from return_states where function = 'atomic_sub' and (type = 8023 or type = 8024);
158 delete from return_states where function = 'refcount_add_not_zero' and (type = 8023 or type = 8024);
159 delete from return_states where function = 'refcount_inc_not_zero' and (type = 8023 or type = 8024);
160 delete from return_states where function = 'refcount_sub_and_test' and (type = 8023 or type = 8024);
161
162 update return_states set return = '0-32,2147483648-2147483690' where function = '_parse_integer' and return = '0';
163 update return_states set value = '0-u64max' where function = '_parse_integer' and type = 1025 and parameter = 2 and key = '*$';
164
165 /* delete some function pointers which are sometimes byte units */
166 delete from caller_info where function = '(struct i2c_algorithm)->master_xfer' and type = 1027;
167
168 /* this if from READ_ONCE(). We can't know anything about the data. */
169 delete from type_info where key = '(union anonymous)->__val';
170
171 /* This is RIO_BAD_SIZE */
172 delete from return_states where file = 'drivers/rapidio/rio-access.c' and return = '129';
173
174 /* Smatch sucks at loops */
175 delete from return_states where function = 'ata_dev_next' and type = 103;
176
177 EOF
178
179 # fixme: this is totally broken
180 call_id=$(echo "select distinct call_id from caller_info where function = '__kernel_write';" | sqlite3 $db_file)
181 for id in $call_id ; do
182 echo "insert into caller_info values ('fake', '', '__kernel_write', $id, 0, 8017, 1, '*\$', '');" | sqlite3 $db_file
183 done
184
185 for i in $(echo "select distinct return from return_states where function = 'clear_user';" | sqlite3 $db_file ) ; do
186 echo "update return_states set return = \"$i[<=\$1]\" where return = \"$i\" and function = 'clear_user';" | sqlite3 $db_file
187 done
188
189 echo "select distinct file, function from function_ptr where ptr='(struct rtl_hal_ops)->set_hw_reg';" \
190 | sqlite3 $db_file | sed -e 's/|/ /' | while read file function ; do
191
192 drv=$(echo $file | perl -ne 's/.*\/rtlwifi\/(.*?)\/sw.c/$1/; print')
193 if [ $drv = "" ] ; then
194 continue
195 fi
196
197 echo "update caller_info
198 set function = '$drv (struct rtl_hal_ops)->set_hw_reg'
199 where function = '(struct rtl_hal_ops)->set_hw_reg' and file like 'drivers/net/wireless/rtlwifi/$drv/%';" \
200 | sqlite3 $db_file
201
202 echo "insert into function_ptr values ('$file', '$function', '$drv (struct rtl_hal_ops)->set_hw_reg', 1);" \
203 | sqlite3 $db_file
204 done
205
206
207 for func in __kmalloc __kmalloc_track_caller ; do
208
209 cat << EOF | sqlite3 $db_file
210 delete from return_states where function = '$func';
211 insert into return_states values ('faked', '$func', 0, 1, '16', 0, 0, -1, '', '');
212 insert into return_states values ('faked', '$func', 0, 1, '16', 0, 103, 0, '\$', '0');
213 insert into return_states values ('faked', '$func', 0, 2, '4096-ptr_max', 0, 0, -1, '', '');
214 insert into return_states values ('faked', '$func', 0, 2, '4096-ptr_max', 0, 103, 0, '\$', '1-4000000');
215 insert into return_states values ('faked', '$func', 0, 2, '4096-ptr_max', 0, 1037, -1, '', 400);
216 insert into return_states values ('faked', '$func', 0, 3, '0', 0, 0, -1, '', '');
217 insert into return_states values ('faked', '$func', 0, 3, '0', 0, 103, 0, '\$', '1-long_max');
218 EOF
219 done