79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012 Red Hat, Inc.
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*/
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/*\
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* [Description]
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*
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* Bug in the splice code has caused the file position on the write side
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* of the sendfile system call to be incorrectly set to the read side file
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* position. This can result in the data being written to an incorrect offset.
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*
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* This is a regression test for kernel commit 2cb4b05e76478.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/sendfile.h>
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#include "tst_test.h"
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#define IN_FILE "in_file"
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#define OUT_FILE "out_file"
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#define TEST_MSG_IN "world"
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#define TEST_MSG_OUT "hello"
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#define TEST_MSG_ALL (TEST_MSG_OUT TEST_MSG_IN)
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static int in_fd;
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static int out_fd;
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static void run(void)
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{
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TEST(sendfile(out_fd, in_fd, NULL, strlen(TEST_MSG_IN)));
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if (TST_RET == -1)
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tst_brk(TBROK | TTERRNO, "sendfile() failed");
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char buf[BUFSIZ];
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SAFE_LSEEK(out_fd, 0, SEEK_SET);
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SAFE_READ(0, out_fd, buf, BUFSIZ);
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if (!strncmp(buf, TEST_MSG_ALL, strlen(TEST_MSG_ALL))) {
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tst_res(TPASS, "sendfile() copies data correctly");
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return;
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}
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tst_res(TFAIL, "sendfile() copies data incorrectly: '%s' expected: '%s%s'",
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buf, TEST_MSG_OUT, TEST_MSG_IN);
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}
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static void setup(void)
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{
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in_fd = SAFE_CREAT(IN_FILE, 0700);
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SAFE_WRITE(SAFE_WRITE_ALL, in_fd, TEST_MSG_IN, strlen(TEST_MSG_IN));
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SAFE_CLOSE(in_fd);
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in_fd = SAFE_OPEN(IN_FILE, O_RDONLY);
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out_fd = SAFE_OPEN(OUT_FILE, O_TRUNC | O_CREAT | O_RDWR, 0777);
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SAFE_WRITE(SAFE_WRITE_ALL, out_fd, TEST_MSG_OUT, strlen(TEST_MSG_OUT));
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}
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static void cleanup(void)
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{
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SAFE_CLOSE(in_fd);
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SAFE_CLOSE(out_fd);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = run,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "2cb4b05e76478"},
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{}
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}
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};
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