| 1 | |
| 2 | |
| 3 | * This test covers the PR_SET_NAME functionality of prctl calls
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| 4 |
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| 5 |
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| 6 | #include <errno.h>
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| 7 | #include <sys/prctl.h>
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| 8 | #include <string.h>
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| 9 |
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| 10 | #include "kselftest_harness.h"
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| 11 |
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| 12 | #define CHANGE_NAME "changename"
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| 13 | #define EMPTY_NAME ""
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| 14 | #define TASK_COMM_LEN 16
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| 15 | #define MAX_PATH_LEN 50
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| 16 |
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| 17 | int set_name(char *name)
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| 18 | {
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| 19 | int res;
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| 20 |
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| 21 | res = prctl(PR_SET_NAME, name, NULL, NULL, NULL);
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| 22 |
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| 23 | if (res < 0)
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| 24 | return -errno;
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| 25 | return res;
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| 26 | }
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| 27 |
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| 28 | int check_is_name_correct(char *check_name)
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| 29 | {
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| 30 | char name[TASK_COMM_LEN];
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| 31 | int res;
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| 32 |
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| 33 | res = prctl(PR_GET_NAME, name, NULL, NULL, NULL);
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| 34 |
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| 35 | if (res < 0)
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| 36 | return -errno;
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| 37 |
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| 38 | return !strcmp(name, check_name);
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| 39 | }
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| 40 |
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| 41 | int check_null_pointer(char *check_name)
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| 42 | {
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| 43 | char *name = NULL;
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| 44 | int res;
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| 45 |
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| 46 | res = prctl(PR_GET_NAME, name, NULL, NULL, NULL);
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| 47 |
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| 48 | return res;
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| 49 | }
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| 50 |
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| 51 | int check_name(void)
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| 52 | {
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| 53 |
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| 54 | int pid;
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| 55 |
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| 56 | pid = getpid();
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| 57 | FILE *fptr = NULL;
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| 58 | char path[MAX_PATH_LEN] = {};
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| 59 | char name[TASK_COMM_LEN] = {};
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| 60 | char output[TASK_COMM_LEN] = {};
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| 61 | int j;
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| 62 |
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| 63 | j = snprintf(path, MAX_PATH_LEN, "/proc/self/task/%d/comm", pid);
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| 64 | fptr = fopen(path, "r");
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| 65 | if (!fptr)
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| 66 | return -EIO;
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| 67 |
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| 68 | fscanf(fptr, "%s", output);
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| 69 | if (ferror(fptr))
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| 70 | return -EIO;
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| 71 |
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| 72 | int res = prctl(PR_GET_NAME, name, NULL, NULL, NULL);
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| 73 |
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| 74 | if (res < 0)
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| 75 | return -errno;
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| 76 |
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| 77 | return !strcmp(output, name);
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| 78 | }
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| 79 |
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| 80 | TEST(rename_process) {
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| 81 |
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| 82 | EXPECT_GE(set_name(CHANGE_NAME), 0);
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| 83 | EXPECT_TRUE(check_is_name_correct(CHANGE_NAME));
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| 84 |
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| 85 | EXPECT_GE(set_name(EMPTY_NAME), 0);
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| 86 | EXPECT_TRUE(check_is_name_correct(EMPTY_NAME));
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| 87 |
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| 88 | EXPECT_GE(set_name(CHANGE_NAME), 0);
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| 89 | EXPECT_LT(check_null_pointer(CHANGE_NAME), 0);
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| 90 |
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| 91 | EXPECT_TRUE(check_name());
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| 92 | }
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| 93 |
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| 94 | TEST_HARNESS_MAIN
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