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6218f2b7a3
* tests/dd/fail-ftruncate-fstat.sh: Use $EPERM rather than mapping specific strings to the Linux $EPERM. * tests/mkdir/smack-no-root.sh: Use $EPERM rather than hardcoding.
78 lines
2.1 KiB
Bash
Executable File
78 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# Check that 'dd' does not continue copying if ftruncate and fstat fail.
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# Copyright (C) 2025-2026 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ dd
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require_gcc_shared_
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getlimits_
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cat > k.c <<'EOF' || framework_failure_
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#include <sys/stat.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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int
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ftruncate (int fd, off_t length)
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{
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/* Prove that LD_PRELOAD works: create the evidence file "x". */
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fclose (fopen ("x", "w"));
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/* Pretend failure. */
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errno = EPERM;
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return -1;
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}
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int
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fstat (int fd, struct stat *statbuf)
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{
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/* Prove that LD_PRELOAD works: create the evidence file "y". */
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fclose (fopen ("y", "w"));
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/* Pretend failure. */
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errno = EPERM;
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return -1;
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}
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EOF
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# Then compile/link it:
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gcc_shared_ k.c k.so \
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|| framework_failure_ 'failed to build shared library'
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# Setup the file "out" and preserve it's original contents in "exp-out".
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yes | head -n 2048 | tr -d '\n' > out || framework_failure_
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cp out exp-out || framework_failure_
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LD_PRELOAD=$LD_PRELOAD:./k.so dd if=/dev/zero of=out count=1 \
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seek=1 status=none 2>err
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ret=$?
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test -f x && test -f y \
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|| skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
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# After ftruncate fails, we use fstat to get the file type.
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echo "dd: cannot fstat 'out': $EPERM" > exp
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compare exp err || fail=1
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# coreutils 9.1 to 9.9 would mistakenly continue copying after ftruncate
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# failed and exit successfully.
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test "$ret" = 1 || fail=1
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compare exp-out out || fail=1
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Exit $fail
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