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author | 2022-05-20 10:50:21 -0400 | |
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committer | 2022-05-20 10:50:21 -0400 | |
commit | bbdd82e2953e8aad8eaa432a93e631422da17470 (patch) | |
tree | a3b6a4f13ebcc7a23d6032233b4bf14729a7ffa3 /src | |
parent | --oom (#5122) (diff) | |
download | firejail-bbdd82e2953e8aad8eaa432a93e631422da17470.tar.gz firejail-bbdd82e2953e8aad8eaa432a93e631422da17470.tar.zst firejail-bbdd82e2953e8aad8eaa432a93e631422da17470.zip |
--oom
Diffstat (limited to 'src')
-rw-r--r-- | src/firejail/oom.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/firejail/oom.c b/src/firejail/oom.c new file mode 100644 index 000000000..11d08fc48 --- /dev/null +++ b/src/firejail/oom.c | |||
@@ -0,0 +1,87 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2014-2022 Firejail Authors | ||
3 | * | ||
4 | * This file is part of firejail project | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License as published by | ||
8 | * the Free Software Foundation; either version 2 of the License, or | ||
9 | * (at your option) any later version. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License along | ||
17 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | ||
19 | */ | ||
20 | #include "firejail.h" | ||
21 | #include <sys/wait.h> | ||
22 | |||
23 | void oom_set(const char *oom_string) { | ||
24 | int oom = atoi(oom_string); | ||
25 | uid_t uid = getuid(); | ||
26 | if (uid == 0) { | ||
27 | if (oom < -1000 || oom > 1000) { | ||
28 | fprintf(stderr, "Error: invalid oom value (-1000 to 1000)\n"); | ||
29 | exit(1); | ||
30 | } | ||
31 | } | ||
32 | else { | ||
33 | if (oom < 0 || oom > 1000) { | ||
34 | fprintf(stderr, "Error: invalid oom value (0 to 1000)\n"); | ||
35 | exit(1); | ||
36 | } | ||
37 | } | ||
38 | |||
39 | pid_t parent = getpid(); | ||
40 | pid_t child = fork(); | ||
41 | if (child == -1) | ||
42 | errExit("fork"); | ||
43 | if (child == 0) { | ||
44 | EUID_ROOT(); | ||
45 | // elevate privileges | ||
46 | if (setreuid(0, 0)) | ||
47 | errExit("setreuid"); | ||
48 | if (setregid(0, 0)) | ||
49 | errExit("setregid"); | ||
50 | |||
51 | char *fname; | ||
52 | if (asprintf(&fname, "/proc/%d/oom_score_adj", parent) == -1) | ||
53 | errExit("asprintf"); | ||
54 | FILE *fp = fopen(fname, "w"); | ||
55 | if (!fp) { | ||
56 | fprintf(stderr, "Error: cannot open %s\n", fname); | ||
57 | exit(1); | ||
58 | } | ||
59 | fprintf(fp, "%d", oom); | ||
60 | fclose(fp); | ||
61 | free(fname); | ||
62 | |||
63 | if (asprintf(&fname, "/proc/%d/oom_score", parent) == -1) | ||
64 | errExit("asprintf"); | ||
65 | fp = fopen(fname, "r"); | ||
66 | if (!fp) { | ||
67 | fprintf(stderr, "Error: cannot open %s\n", fname); | ||
68 | exit(1); | ||
69 | } | ||
70 | int newoom; | ||
71 | if (1 != fscanf(fp, "%d", &newoom)) { | ||
72 | fprintf(stderr, "Error: connot read from %s\n", fname); | ||
73 | exit(1); | ||
74 | } | ||
75 | fclose(fp); | ||
76 | free(fname); | ||
77 | |||
78 | if (!arg_quiet) | ||
79 | printf("Out-Of-Memory score adjusted, new value %d\n", newoom); | ||
80 | exit(0); | ||
81 | } | ||
82 | |||
83 | int status; | ||
84 | if (waitpid(child, &status, 0) == -1 ) | ||
85 | errExit("waitpid"); | ||
86 | } | ||
87 | |||