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40 lines
775 B
40 lines
775 B
/*
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* Test that GDB can access PROT_NONE pages.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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void break_here(void *q)
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{
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}
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int main(void)
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{
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long pagesize = sysconf(_SC_PAGESIZE);
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void *p, *q;
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int err;
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p = mmap(NULL, pagesize * 2, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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assert(p != MAP_FAILED);
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q = p + pagesize - 1;
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strcpy(q, "42");
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err = mprotect(p, pagesize * 2, PROT_NONE);
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assert(err == 0);
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break_here(q);
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err = mprotect(p, pagesize * 2, PROT_READ);
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assert(err == 0);
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if (getenv("PROT_NONE_PY")) {
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assert(strcmp(q, "24") == 0);
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}
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return EXIT_SUCCESS;
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}
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