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b97396baca
* Adjust the comment to reflect the fact that SIGBUS can occur not only if the file is truncated, but also if an I/O error occurs while paging in any part of it. * Instead of setting a flag, just return EIO. * Adjust the unit test accordingly. MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: thj, kevans Differential Revision: https://reviews.freebsd.org/D55108 (cherry picked from commit a689bfa4e25af8307709dc12f75b0e02a65abf18)
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*-
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* Copyright (c) 2024 Klara, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <arraylist.h>
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#include <diff_main.h>
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#include <atf-c.h>
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ATF_TC_WITH_CLEANUP(diff_atomize_truncated);
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ATF_TC_HEAD(diff_atomize_truncated, tc)
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{
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atf_tc_set_md_var(tc, "descr", "Verify that the atomizer "
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"does not crash when an input file is truncated");
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}
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ATF_TC_BODY(diff_atomize_truncated, tc)
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{
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char line[128];
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struct diff_config cfg = { .atomize_func = diff_atomize_text_by_line };
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struct diff_data d = { };
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const char *fn = atf_tc_get_ident(tc);
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FILE *f;
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unsigned char *p;
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size_t size = 65536;
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ATF_REQUIRE((f = fopen(fn, "w+")) != NULL);
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line[sizeof(line) - 1] = '\n';
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for (unsigned int i = 0; i <= size / sizeof(line); i++) {
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memset(line, 'a' + i % 26, sizeof(line) - 1);
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ATF_REQUIRE(fwrite(line, sizeof(line), 1, f) == 1);
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}
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ATF_REQUIRE(fsync(fileno(f)) == 0);
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rewind(f);
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ATF_REQUIRE(truncate(fn, size / 2) == 0);
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ATF_REQUIRE((p = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fileno(f), 0)) != MAP_FAILED);
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ATF_REQUIRE(diff_atomize_file(&d, &cfg, f, p, size, 0) == EIO);
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ATF_REQUIRE((size_t)d.len <= size / 2);
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ATF_REQUIRE((size_t)d.len >= size / 2 - sizeof(line));
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}
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ATF_TC_CLEANUP(diff_atomize_truncated, tc)
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{
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unlink(atf_tc_get_ident(tc));
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, diff_atomize_truncated);
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return atf_no_error();
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}
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