1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /// 2 ///
3 /// Find if/else condition with kmalloc/vmallo 3 /// Find if/else condition with kmalloc/vmalloc calls.
4 /// Suggest to use kvmalloc instead. Same for 4 /// Suggest to use kvmalloc instead. Same for kvfree.
5 /// 5 ///
6 // Confidence: High 6 // Confidence: High
7 // Copyright: (C) 2020 Denis Efremov ISPRAS 7 // Copyright: (C) 2020 Denis Efremov ISPRAS
8 // Options: --no-includes --include-headers 8 // Options: --no-includes --include-headers
9 // 9 //
10 10
11 virtual patch 11 virtual patch
12 virtual report 12 virtual report
13 virtual org 13 virtual org
14 virtual context 14 virtual context
15 15
16 @initialize:python@ 16 @initialize:python@
17 @@ 17 @@
18 filter = frozenset(['kvfree']) 18 filter = frozenset(['kvfree'])
19 19
20 def relevant(p): 20 def relevant(p):
21 return not (filter & {el.current_element f 21 return not (filter & {el.current_element for el in p})
22 22
23 @kvmalloc depends on !patch@ 23 @kvmalloc depends on !patch@
24 expression E, E1, size; 24 expression E, E1, size;
25 identifier flags; 25 identifier flags;
26 binary operator cmp = {<=, <, ==, >, >=}; 26 binary operator cmp = {<=, <, ==, >, >=};
27 identifier x; 27 identifier x;
28 type T; 28 type T;
29 position p; 29 position p;
30 @@ 30 @@
31 31
32 ( 32 (
33 * if (size cmp E1 || ...)@p { 33 * if (size cmp E1 || ...)@p {
34 ... 34 ...
35 * E = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_ 35 * E = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_node\|kzalloc_node\|
36 * kmalloc_array\|kmalloc_array_node\| 36 * kmalloc_array\|kmalloc_array_node\|kcalloc_node\)
37 * (..., size, \(flags\|GFP_KERNEL\|\( 37 * (..., size, \(flags\|GFP_KERNEL\|\(GFP_KERNEL\|flags\)|__GFP_NOWARN\), ...)
38 ... 38 ...
39 } else { 39 } else {
40 ... 40 ...
41 * E = \(vmalloc\|vzalloc\|vmalloc_node\|vza 41 * E = \(vmalloc\|vzalloc\|vmalloc_node\|vzalloc_node\)(..., size, ...)
42 ... 42 ...
43 } 43 }
44 | 44 |
45 * E = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_nod 45 * E = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_node\|kzalloc_node\|
46 * kmalloc_array\|kmalloc_array_node\|kca 46 * kmalloc_array\|kmalloc_array_node\|kcalloc_node\)
47 * (..., size, \(flags\|GFP_KERNEL\|\(GFP 47 * (..., size, \(flags\|GFP_KERNEL\|\(GFP_KERNEL\|flags\)|__GFP_NOWARN\), ...)
48 ... when != E = E1 48 ... when != E = E1
49 when != size = E1 49 when != size = E1
50 when any 50 when any
51 * if (E == NULL)@p { 51 * if (E == NULL)@p {
52 ... 52 ...
53 * E = \(vmalloc\|vzalloc\|vmalloc_node\|vzal 53 * E = \(vmalloc\|vzalloc\|vmalloc_node\|vzalloc_node\)(..., size, ...)
54 ... 54 ...
55 } 55 }
56 | 56 |
57 * T x = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_n 57 * T x = \(kmalloc\|kzalloc\|kcalloc\|kmalloc_node\|kzalloc_node\|
58 * kmalloc_array\|kmalloc_array_node\|k 58 * kmalloc_array\|kmalloc_array_node\|kcalloc_node\)
59 * (..., size, \(flags\|GFP_KERNEL\|\(G 59 * (..., size, \(flags\|GFP_KERNEL\|\(GFP_KERNEL\|flags\)|__GFP_NOWARN\), ...);
60 ... when != x = E1 60 ... when != x = E1
61 when != size = E1 61 when != size = E1
62 when any 62 when any
63 * if (x == NULL)@p { 63 * if (x == NULL)@p {
64 ... 64 ...
65 * x = \(vmalloc\|vzalloc\|vmalloc_node\|vzal 65 * x = \(vmalloc\|vzalloc\|vmalloc_node\|vzalloc_node\)(..., size, ...)
66 ... 66 ...
67 } 67 }
68 ) 68 )
69 69
70 @kvfree depends on !patch@ 70 @kvfree depends on !patch@
71 expression E; 71 expression E;
72 position p : script:python() { relevant(p) }; 72 position p : script:python() { relevant(p) };
73 @@ 73 @@
74 74
75 * if (is_vmalloc_addr(E))@p { 75 * if (is_vmalloc_addr(E))@p {
76 ... 76 ...
77 * vfree(E) 77 * vfree(E)
78 ... 78 ...
79 } else { 79 } else {
80 ... when != krealloc(E, ...) 80 ... when != krealloc(E, ...)
81 when any 81 when any
82 * \(kfree\|kfree_sensitive\)(E) !! 82 * \(kfree\|kzfree\)(E)
83 ... 83 ...
84 } 84 }
85 85
86 @depends on patch@ 86 @depends on patch@
87 expression E, E1, size, node; 87 expression E, E1, size, node;
88 binary operator cmp = {<=, <, ==, >, >=}; 88 binary operator cmp = {<=, <, ==, >, >=};
89 identifier flags, x; 89 identifier flags, x;
90 type T; 90 type T;
91 @@ 91 @@
92 92
93 ( 93 (
94 - if (size cmp E1) 94 - if (size cmp E1)
95 - E = kmalloc(size, flags); 95 - E = kmalloc(size, flags);
96 - else 96 - else
97 - E = vmalloc(size); 97 - E = vmalloc(size);
98 + E = kvmalloc(size, flags); 98 + E = kvmalloc(size, flags);
99 | 99 |
100 - if (size cmp E1) 100 - if (size cmp E1)
101 - E = kmalloc(size, \(GFP_KERNEL\|GFP_KERNE 101 - E = kmalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
102 - else 102 - else
103 - E = vmalloc(size); 103 - E = vmalloc(size);
104 + E = kvmalloc(size, GFP_KERNEL); 104 + E = kvmalloc(size, GFP_KERNEL);
105 | 105 |
106 - E = kmalloc(size, flags | __GFP_NOWARN); 106 - E = kmalloc(size, flags | __GFP_NOWARN);
107 - if (E == NULL) 107 - if (E == NULL)
108 - E = vmalloc(size); 108 - E = vmalloc(size);
109 + E = kvmalloc(size, flags); 109 + E = kvmalloc(size, flags);
110 | 110 |
111 - E = kmalloc(size, \(GFP_KERNEL\|GFP_KERNEL|_ 111 - E = kmalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
112 - if (E == NULL) 112 - if (E == NULL)
113 - E = vmalloc(size); 113 - E = vmalloc(size);
114 + E = kvmalloc(size, GFP_KERNEL); 114 + E = kvmalloc(size, GFP_KERNEL);
115 | 115 |
116 - T x = kmalloc(size, flags | __GFP_NOWARN); 116 - T x = kmalloc(size, flags | __GFP_NOWARN);
117 - if (x == NULL) 117 - if (x == NULL)
118 - x = vmalloc(size); 118 - x = vmalloc(size);
119 + T x = kvmalloc(size, flags); 119 + T x = kvmalloc(size, flags);
120 | 120 |
121 - T x = kmalloc(size, \(GFP_KERNEL\|GFP_KERNEL 121 - T x = kmalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
122 - if (x == NULL) 122 - if (x == NULL)
123 - x = vmalloc(size); 123 - x = vmalloc(size);
124 + T x = kvmalloc(size, GFP_KERNEL); 124 + T x = kvmalloc(size, GFP_KERNEL);
125 | 125 |
126 - if (size cmp E1) 126 - if (size cmp E1)
127 - E = kzalloc(size, flags); 127 - E = kzalloc(size, flags);
128 - else 128 - else
129 - E = vzalloc(size); 129 - E = vzalloc(size);
130 + E = kvzalloc(size, flags); 130 + E = kvzalloc(size, flags);
131 | 131 |
132 - if (size cmp E1) 132 - if (size cmp E1)
133 - E = kzalloc(size, \(GFP_KERNEL\|GFP_KERNE 133 - E = kzalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
134 - else 134 - else
135 - E = vzalloc(size); 135 - E = vzalloc(size);
136 + E = kvzalloc(size, GFP_KERNEL); 136 + E = kvzalloc(size, GFP_KERNEL);
137 | 137 |
138 - E = kzalloc(size, flags | __GFP_NOWARN); 138 - E = kzalloc(size, flags | __GFP_NOWARN);
139 - if (E == NULL) 139 - if (E == NULL)
140 - E = vzalloc(size); 140 - E = vzalloc(size);
141 + E = kvzalloc(size, flags); 141 + E = kvzalloc(size, flags);
142 | 142 |
143 - E = kzalloc(size, \(GFP_KERNEL\|GFP_KERNEL|_ 143 - E = kzalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
144 - if (E == NULL) 144 - if (E == NULL)
145 - E = vzalloc(size); 145 - E = vzalloc(size);
146 + E = kvzalloc(size, GFP_KERNEL); 146 + E = kvzalloc(size, GFP_KERNEL);
147 | 147 |
148 - T x = kzalloc(size, flags | __GFP_NOWARN); 148 - T x = kzalloc(size, flags | __GFP_NOWARN);
149 - if (x == NULL) 149 - if (x == NULL)
150 - x = vzalloc(size); 150 - x = vzalloc(size);
151 + T x = kvzalloc(size, flags); 151 + T x = kvzalloc(size, flags);
152 | 152 |
153 - T x = kzalloc(size, \(GFP_KERNEL\|GFP_KERNEL 153 - T x = kzalloc(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\));
154 - if (x == NULL) 154 - if (x == NULL)
155 - x = vzalloc(size); 155 - x = vzalloc(size);
156 + T x = kvzalloc(size, GFP_KERNEL); 156 + T x = kvzalloc(size, GFP_KERNEL);
157 | 157 |
158 - if (size cmp E1) 158 - if (size cmp E1)
159 - E = kmalloc_node(size, flags, node); 159 - E = kmalloc_node(size, flags, node);
160 - else 160 - else
161 - E = vmalloc_node(size, node); 161 - E = vmalloc_node(size, node);
162 + E = kvmalloc_node(size, flags, node); 162 + E = kvmalloc_node(size, flags, node);
163 | 163 |
164 - if (size cmp E1) 164 - if (size cmp E1)
165 - E = kmalloc_node(size, \(GFP_KERNEL\|GFP_ 165 - E = kmalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
166 - else 166 - else
167 - E = vmalloc_node(size, node); 167 - E = vmalloc_node(size, node);
168 + E = kvmalloc_node(size, GFP_KERNEL, node); 168 + E = kvmalloc_node(size, GFP_KERNEL, node);
169 | 169 |
170 - E = kmalloc_node(size, flags | __GFP_NOWARN, 170 - E = kmalloc_node(size, flags | __GFP_NOWARN, node);
171 - if (E == NULL) 171 - if (E == NULL)
172 - E = vmalloc_node(size, node); 172 - E = vmalloc_node(size, node);
173 + E = kvmalloc_node(size, flags, node); 173 + E = kvmalloc_node(size, flags, node);
174 | 174 |
175 - E = kmalloc_node(size, \(GFP_KERNEL\|GFP_KER 175 - E = kmalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
176 - if (E == NULL) 176 - if (E == NULL)
177 - E = vmalloc_node(size, node); 177 - E = vmalloc_node(size, node);
178 + E = kvmalloc_node(size, GFP_KERNEL, node); 178 + E = kvmalloc_node(size, GFP_KERNEL, node);
179 | 179 |
180 - T x = kmalloc_node(size, flags | __GFP_NOWAR 180 - T x = kmalloc_node(size, flags | __GFP_NOWARN, node);
181 - if (x == NULL) 181 - if (x == NULL)
182 - x = vmalloc_node(size, node); 182 - x = vmalloc_node(size, node);
183 + T x = kvmalloc_node(size, flags, node); 183 + T x = kvmalloc_node(size, flags, node);
184 | 184 |
185 - T x = kmalloc_node(size, \(GFP_KERNEL\|GFP_K 185 - T x = kmalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
186 - if (x == NULL) 186 - if (x == NULL)
187 - x = vmalloc_node(size, node); 187 - x = vmalloc_node(size, node);
188 + T x = kvmalloc_node(size, GFP_KERNEL, node); 188 + T x = kvmalloc_node(size, GFP_KERNEL, node);
189 | 189 |
190 - if (size cmp E1) 190 - if (size cmp E1)
191 - E = kvzalloc_node(size, flags, node); 191 - E = kvzalloc_node(size, flags, node);
192 - else 192 - else
193 - E = vzalloc_node(size, node); 193 - E = vzalloc_node(size, node);
194 + E = kvzalloc_node(size, flags, node); 194 + E = kvzalloc_node(size, flags, node);
195 | 195 |
196 - if (size cmp E1) 196 - if (size cmp E1)
197 - E = kvzalloc_node(size, \(GFP_KERNEL\|GFP 197 - E = kvzalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
198 - else 198 - else
199 - E = vzalloc_node(size, node); 199 - E = vzalloc_node(size, node);
200 + E = kvzalloc_node(size, GFP_KERNEL, node); 200 + E = kvzalloc_node(size, GFP_KERNEL, node);
201 | 201 |
202 - E = kvzalloc_node(size, flags | __GFP_NOWARN 202 - E = kvzalloc_node(size, flags | __GFP_NOWARN, node);
203 - if (E == NULL) 203 - if (E == NULL)
204 - E = vzalloc_node(size, node); 204 - E = vzalloc_node(size, node);
205 + E = kvzalloc_node(size, flags, node); 205 + E = kvzalloc_node(size, flags, node);
206 | 206 |
207 - E = kvzalloc_node(size, \(GFP_KERNEL\|GFP_KE 207 - E = kvzalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
208 - if (E == NULL) 208 - if (E == NULL)
209 - E = vzalloc_node(size, node); 209 - E = vzalloc_node(size, node);
210 + E = kvzalloc_node(size, GFP_KERNEL, node); 210 + E = kvzalloc_node(size, GFP_KERNEL, node);
211 | 211 |
212 - T x = kvzalloc_node(size, flags | __GFP_NOWA 212 - T x = kvzalloc_node(size, flags | __GFP_NOWARN, node);
213 - if (x == NULL) 213 - if (x == NULL)
214 - x = vzalloc_node(size, node); 214 - x = vzalloc_node(size, node);
215 + T x = kvzalloc_node(size, flags, node); 215 + T x = kvzalloc_node(size, flags, node);
216 | 216 |
217 - T x = kvzalloc_node(size, \(GFP_KERNEL\|GFP_ 217 - T x = kvzalloc_node(size, \(GFP_KERNEL\|GFP_KERNEL|__GFP_NOWARN\), node);
218 - if (x == NULL) 218 - if (x == NULL)
219 - x = vzalloc_node(size, node); 219 - x = vzalloc_node(size, node);
220 + T x = kvzalloc_node(size, GFP_KERNEL, node); 220 + T x = kvzalloc_node(size, GFP_KERNEL, node);
221 ) 221 )
222 222
223 @depends on patch@ 223 @depends on patch@
224 expression E; 224 expression E;
225 position p : script:python() { relevant(p) }; 225 position p : script:python() { relevant(p) };
226 @@ 226 @@
227 227
228 - if (is_vmalloc_addr(E))@p 228 - if (is_vmalloc_addr(E))@p
229 - vfree(E); 229 - vfree(E);
230 - else 230 - else
231 - kfree(E); 231 - kfree(E);
232 + kvfree(E); 232 + kvfree(E);
233 233
234 @script: python depends on report@ 234 @script: python depends on report@
235 p << kvmalloc.p; 235 p << kvmalloc.p;
236 @@ 236 @@
237 237
238 coccilib.report.print_report(p[0], "WARNING op 238 coccilib.report.print_report(p[0], "WARNING opportunity for kvmalloc")
239 239
240 @script: python depends on org@ 240 @script: python depends on org@
241 p << kvmalloc.p; 241 p << kvmalloc.p;
242 @@ 242 @@
243 243
244 coccilib.org.print_todo(p[0], "WARNING opportu 244 coccilib.org.print_todo(p[0], "WARNING opportunity for kvmalloc")
245 245
246 @script: python depends on report@ 246 @script: python depends on report@
247 p << kvfree.p; 247 p << kvfree.p;
248 @@ 248 @@
249 249
250 coccilib.report.print_report(p[0], "WARNING op 250 coccilib.report.print_report(p[0], "WARNING opportunity for kvfree")
251 251
252 @script: python depends on org@ 252 @script: python depends on org@
253 p << kvfree.p; 253 p << kvfree.p;
254 @@ 254 @@
255 255
256 coccilib.org.print_todo(p[0], "WARNING opportu 256 coccilib.org.print_todo(p[0], "WARNING opportunity for kvfree")
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.