f183754779
Similar to a recent test I fixed for gdb-remote attach scenarios, this fix is for Linux kernels, such as Ubuntu's stock setup on 11.04-ish and later, where ptrace starts requiring a ptracer to be an ancestor of the inferior to be ptraced. This change checks for Linux and the ptrace-related flags. If they're found, it tries to switch on the "allow any ptracer" mode for the inferior as the first statements in the program. It's a best-effort solution - if the prctl call fails, the failure is ignored, and probably will lead to the test failing. The ptrace security behavior can be modified system-wide, but is outside the scope of the test to address. Hence I went with this particular solution. llvm-svn: 220650
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
#include <stdio.h>
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#if defined(__linux__)
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#include <sys/prctl.h>
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#endif
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int main(int argc, char const *argv[]) {
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#if defined(__linux__)
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// Immediately enable any ptracer so that we can allow the stub attach
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// operation to succeed. Some Linux kernels are locked down so that
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// only an ancestor process can be a ptracer of a process. This disables that
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// restriction. Without it, attach-related stub tests will fail.
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#if defined(PR_SET_PTRACER) && defined(PR_SET_PTRACER_ANY)
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int prctl_result;
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// For now we execute on best effort basis. If this fails for
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// some reason, so be it.
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prctl_result = prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
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(void) prctl_result;
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#endif
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#endif
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printf("Hello world.\n"); // Set break point at this line.
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if (argc == 1)
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return 0;
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// Waiting to be attached by the debugger, otherwise.
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char line[100];
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while (fgets(line, sizeof(line), stdin)) { // Waiting to be attached...
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printf("input line=>%s\n", line);
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}
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printf("Exiting now\n");
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}
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