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2679f63fe5
This adds a set of test cases to test the behaviour of copy_tofrom_user when exceptions are encountered accessing the source or destination. Currently, copy_tofrom_user does not always copy as many bytes as possible when an exception occurs on a store to the destination, and that is reflected in failures in these tests. Based on a test program from Anton Blanchard. [paulus@ozlabs.org - test all three paths, wrote commit description, made EX_TABLE create an exception table.] Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "utils.h"
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extern char __start___ex_table[];
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extern char __stop___ex_table[];
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#if defined(__powerpc64__)
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#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.gp_regs[PT_NIP]
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#elif defined(__powerpc__)
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#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
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#else
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#error implement UCONTEXT_NIA
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#endif
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static void segv_handler(int signr, siginfo_t *info, void *ptr)
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{
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ucontext_t *uc = (ucontext_t *)ptr;
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unsigned long addr = (unsigned long)info->si_addr;
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unsigned long *ip = &UCONTEXT_NIA(uc);
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unsigned long *ex_p = (unsigned long *)__start___ex_table;
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while (ex_p < (unsigned long *)__stop___ex_table) {
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unsigned long insn, fixup;
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insn = *ex_p++;
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fixup = *ex_p++;
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if (insn == *ip) {
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*ip = fixup;
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return;
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}
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}
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printf("No exception table match for NIA %lx ADDR %lx\n", *ip, addr);
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abort();
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}
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static void setup_segv_handler(void)
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{
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_sigaction = segv_handler;
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action.sa_flags = SA_SIGINFO;
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sigaction(SIGSEGV, &action, NULL);
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}
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unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
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unsigned long test_copy_tofrom_user_reference(void *to, const void *from, unsigned long size);
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static int total_passed;
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static int total_failed;
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static void do_one_test(char *dstp, char *srcp, unsigned long len)
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{
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unsigned long got, expected;
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got = COPY_LOOP(dstp, srcp, len);
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expected = test_copy_tofrom_user_reference(dstp, srcp, len);
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if (got != expected) {
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total_failed++;
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printf("FAIL from=%p to=%p len=%ld returned %ld, expected %ld\n",
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srcp, dstp, len, got, expected);
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//abort();
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} else
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total_passed++;
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}
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//#define MAX_LEN 512
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#define MAX_LEN 16
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int test_copy_exception(void)
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{
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int page_size;
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static char *p, *q;
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unsigned long src, dst, len;
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page_size = getpagesize();
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p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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if (p == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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memset(p, 0, page_size);
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setup_segv_handler();
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if (mprotect(p + page_size, page_size, PROT_NONE)) {
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perror("mprotect");
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exit(1);
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}
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q = p + page_size - MAX_LEN;
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for (src = 0; src < MAX_LEN; src++) {
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for (dst = 0; dst < MAX_LEN; dst++) {
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for (len = 0; len < MAX_LEN+1; len++) {
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// printf("from=%p to=%p len=%ld\n", q+dst, q+src, len);
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do_one_test(q+dst, q+src, len);
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}
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}
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}
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printf("Totals:\n");
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printf(" Pass: %d\n", total_passed);
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printf(" Fail: %d\n", total_failed);
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return 0;
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}
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int main(void)
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{
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return test_harness(test_copy_exception, str(COPY_LOOP));
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}
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