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0f9a540c8c
Program test-coredump-unwind was modified to map backing files based on virtual addresses instead of segment numbers. The crasher.c is a program that essentially calls some functions and then writes to invalid address causing a crash. Before that, it detects which executables are mapped to which virtual addresses and writes this information to a file suitable for consumption by test-coredump-unwind. The mapping information is obtained form /proc/self/maps, so currently it only works on linux. The test itself is a shell script, which first runs the program and then runs test-coredump-unwind on the resulting core and address space map file to check whether the stack trace obtained from the dump roughly corresponds to what it should look like. Signed-off-by: Martin Milata <mmilata@redhat.com>
64 lines
1 KiB
C
64 lines
1 KiB
C
/* This program should crash and produce coredump */
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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void a(void) __attribute__((noinline));
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void b(int x) __attribute__((noinline));
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#ifdef __linux__
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void write_maps(char *fname)
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{
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char buf[512], path[128];
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char exec;
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uintmax_t addr;
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FILE *maps = fopen("/proc/self/maps", "r");
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FILE *out = fopen(fname, "w");
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if (!maps || !out)
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exit(EXIT_FAILURE);
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while (fgets(buf, sizeof(buf), maps))
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{
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if (sscanf(buf, "%jx-%*jx %*c%*c%c%*c %*x %*s %*d /%126[^\n]", &addr, &exec, path+1) != 3)
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continue;
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if (exec != 'x')
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continue;
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path[0] = '/';
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fprintf(out, "0x%jx:%s ", addr, path);
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}
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fprintf(out, "\n");
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fclose(out);
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fclose(maps);
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}
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#else
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#error Port me
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#endif
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void a(void)
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{
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*(int *)NULL = 42;
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}
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void b(int x)
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{
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if (x)
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a();
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else
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b(1);
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}
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int
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main (int argc, char **argv)
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{
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if (argc > 1)
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write_maps(argv[1]);
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b(0);
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return 0;
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}
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