96 lines
3.4 KiB
Diff
96 lines
3.4 KiB
Diff
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commit 19599883ffb6a450d2884f081f8ecf68edbed7ee
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Author: Jean Delvare <jdelvare@suse.de>
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Date: Thu May 3 14:31:55 2018 +0200
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Don't leak temporary file on failed ed-style patch
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Now that we write ed-style patches to a temporary file before we
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apply them, we need to ensure that the temporary file is removed
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before we leave, even on fatal error.
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* src/pch.c (do_ed_script): Use global TMPEDNAME instead of local
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tmpname. Don't unlink the file directly, instead tag it for removal
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at exit time.
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* src/patch.c (cleanup): Unlink TMPEDNAME at exit.
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This closes bug #53820:
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https://savannah.gnu.org/bugs/index.php?53820
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Fixes: 123eaff0d5d1 ("Fix arbitrary command execution in ed-style patches (CVE-2018-1000156)")
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diff --git a/src/common.h b/src/common.h
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index 904a3f8..53c5e32 100644
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--- a/src/common.h
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+++ b/src/common.h
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@@ -94,10 +94,12 @@ XTERN char const *origsuff;
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XTERN char const * TMPINNAME;
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XTERN char const * TMPOUTNAME;
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XTERN char const * TMPPATNAME;
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+XTERN char const * TMPEDNAME;
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XTERN bool TMPINNAME_needs_removal;
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XTERN bool TMPOUTNAME_needs_removal;
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XTERN bool TMPPATNAME_needs_removal;
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+XTERN bool TMPEDNAME_needs_removal;
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#ifdef DEBUGGING
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XTERN int debug;
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diff --git a/src/patch.c b/src/patch.c
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index 3fcaec5..9146597 100644
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--- a/src/patch.c
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+++ b/src/patch.c
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@@ -1999,6 +1999,7 @@ cleanup (void)
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remove_if_needed (TMPINNAME, &TMPINNAME_needs_removal);
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remove_if_needed (TMPOUTNAME, &TMPOUTNAME_needs_removal);
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remove_if_needed (TMPPATNAME, &TMPPATNAME_needs_removal);
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+ remove_if_needed (TMPEDNAME, &TMPEDNAME_needs_removal);
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remove_if_needed (TMPREJNAME, &TMPREJNAME_needs_removal);
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output_files (NULL);
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}
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diff --git a/src/pch.c b/src/pch.c
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index 79a3c99..1bb3153 100644
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--- a/src/pch.c
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+++ b/src/pch.c
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@@ -2396,7 +2396,6 @@ do_ed_script (char const *inname, char const *outname,
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file_offset beginning_of_this_line;
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size_t chars_read;
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FILE *tmpfp = 0;
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- char const *tmpname;
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int tmpfd = -1; /* placate gcc's -Wmaybe-uninitialized */
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int exclusive = *outname_needs_removal ? 0 : O_EXCL;
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char const **ed_argv;
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@@ -2411,12 +2410,13 @@ do_ed_script (char const *inname, char const *outname,
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invalid commands and treats the next line as a new command, which
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can lead to arbitrary command execution. */
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- tmpfd = make_tempfile (&tmpname, 'e', NULL, O_RDWR | O_BINARY, 0);
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+ tmpfd = make_tempfile (&TMPEDNAME, 'e', NULL, O_RDWR | O_BINARY, 0);
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if (tmpfd == -1)
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- pfatal ("Can't create temporary file %s", quotearg (tmpname));
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+ pfatal ("Can't create temporary file %s", quotearg (TMPEDNAME));
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+ TMPEDNAME_needs_removal = true;
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tmpfp = fdopen (tmpfd, "w+b");
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if (! tmpfp)
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- pfatal ("Can't open stream for file %s", quotearg (tmpname));
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+ pfatal ("Can't open stream for file %s", quotearg (TMPEDNAME));
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}
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for (;;) {
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@@ -2457,7 +2457,7 @@ do_ed_script (char const *inname, char const *outname,
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write_fatal ();
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if (lseek (tmpfd, 0, SEEK_SET) == -1)
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- pfatal ("Can't rewind to the beginning of file %s", quotearg (tmpname));
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+ pfatal ("Can't rewind to the beginning of file %s", quotearg (TMPEDNAME));
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if (inerrno != ENOENT)
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{
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@@ -2484,7 +2484,6 @@ do_ed_script (char const *inname, char const *outname,
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pfatal ("Failed to duplicate standard input");
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fclose (tmpfp);
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- safe_unlink (tmpname);
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if (ofp)
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{
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