4d96fe769a
pkgsrc changes: - Remove custom and no longer needed do-patch target, it was fixed upstream - Minor cosmetic improvements pointed out by pkglint Changes: - Backport patches for CVE-2018-6951, CVE-2018-6952 and CVE-2018-1000156 Patch provided by Attila Fülöp via NetBSD/pkgsrc#33, thanks! Bump PKGREVISION
155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
$NetBSD: patch-src_pch.c,v 1.1 2018/10/18 19:26:16 leot Exp $
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- fixes: CVE-2018-6951 CVE-2018-6952 CVE-2018-1000156
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- bugs: 53132 53133 53566
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https://savannah.gnu.org/bugs/index.php?
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- commit ids: f290f48a62 9c986353e4 123eaff0d5
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https://git.savannah.gnu.org/cgit/patch.git/diff/?id=
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--- src/pch.c.orig 2018-10-09 17:01:21.566749708 +0000
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+++ src/pch.c
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@@ -33,6 +33,7 @@
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# include <io.h>
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#endif
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#include <safe.h>
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+#include <sys/wait.h>
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#define INITHUNKMAX 125 /* initial dynamic allocation size */
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@@ -974,7 +975,8 @@ intuit_diff_type (bool need_header, mode
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if ((pch_rename () || pch_copy ())
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&& ! inname
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&& ! ((i == OLD || i == NEW) &&
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- p_name[! reverse] &&
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+ p_name[reverse] && p_name[! reverse] &&
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+ name_is_valid (p_name[reverse]) &&
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name_is_valid (p_name[! reverse])))
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{
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say ("Cannot %s file without two valid file names\n", pch_rename () ? "rename" : "copy");
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@@ -2113,7 +2115,7 @@ pch_swap (void)
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}
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if (p_efake >= 0) { /* fix non-freeable ptr range */
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if (p_efake <= i)
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- n = p_end - i + 1;
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+ n = p_end - p_ptrn_lines;
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else
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n = -i;
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p_efake += n;
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@@ -2388,22 +2390,27 @@ do_ed_script (char const *inname, char c
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static char const editor_program[] = EDITOR_PROGRAM;
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file_offset beginning_of_this_line;
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- FILE *pipefp = 0;
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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;
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+ pid_t pid;
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- if (! dry_run && ! skip_rest_of_patch) {
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- int exclusive = *outname_needs_removal ? 0 : O_EXCL;
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- assert (! inerrno);
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- *outname_needs_removal = true;
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- copy_file (inname, outname, 0, exclusive, instat.st_mode, true);
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- sprintf (buf, "%s %s%s", editor_program,
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- verbosity == VERBOSE ? "" : "- ",
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- outname);
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- fflush (stdout);
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- pipefp = popen(buf, binary_transput ? "wb" : "w");
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- if (!pipefp)
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- pfatal ("Can't open pipe to %s", quotearg (buf));
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- }
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+ if (! dry_run && ! skip_rest_of_patch)
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+ {
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+ /* Write ed script to a temporary file. This causes ed to abort on
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+ invalid commands such as when line numbers or ranges exceed the
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+ number of available lines. When ed reads from a pipe, it rejects
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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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+
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+ tmpfd = make_tempfile (&tmpname, '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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+ 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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+ }
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for (;;) {
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char ed_command_letter;
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beginning_of_this_line = file_tell (pfp);
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@@ -2414,14 +2421,14 @@ do_ed_script (char const *inname, char c
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}
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ed_command_letter = get_ed_command_letter (buf);
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if (ed_command_letter) {
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- if (pipefp)
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- if (! fwrite (buf, sizeof *buf, chars_read, pipefp))
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+ if (tmpfp)
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+ if (! fwrite (buf, sizeof *buf, chars_read, tmpfp))
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write_fatal ();
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if (ed_command_letter != 'd' && ed_command_letter != 's') {
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p_pass_comments_through = true;
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while ((chars_read = get_line ()) != 0) {
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- if (pipefp)
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- if (! fwrite (buf, sizeof *buf, chars_read, pipefp))
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+ if (tmpfp)
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+ if (! fwrite (buf, sizeof *buf, chars_read, tmpfp))
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write_fatal ();
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if (chars_read == 2 && strEQ (buf, ".\n"))
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break;
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@@ -2434,13 +2441,49 @@ do_ed_script (char const *inname, char c
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break;
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}
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}
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- if (!pipefp)
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+ if (!tmpfp)
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return;
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- if (fwrite ("w\nq\n", sizeof (char), (size_t) 4, pipefp) == 0
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- || fflush (pipefp) != 0)
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+ if (fwrite ("w\nq\n", sizeof (char), (size_t) 4, tmpfp) == 0
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+ || fflush (tmpfp) != 0)
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write_fatal ();
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- if (pclose (pipefp) != 0)
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- fatal ("%s FAILED", editor_program);
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+
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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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+
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+ if (! dry_run && ! skip_rest_of_patch) {
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+ int exclusive = *outname_needs_removal ? 0 : O_EXCL;
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+ *outname_needs_removal = true;
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+ if (inerrno != ENOENT)
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+ {
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+ *outname_needs_removal = true;
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+ copy_file (inname, outname, 0, exclusive, instat.st_mode, true);
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+ }
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+ sprintf (buf, "%s %s%s", editor_program,
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+ verbosity == VERBOSE ? "" : "- ",
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+ outname);
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+ fflush (stdout);
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+
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+ pid = fork();
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+ if (pid == -1)
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+ pfatal ("Can't fork");
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+ else if (pid == 0)
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+ {
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+ dup2 (tmpfd, 0);
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+ execl ("/bin/sh", "sh", "-c", buf, (char *) 0);
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+ _exit (2);
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+ }
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+ else
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+ {
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+ int wstatus;
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+ if (waitpid (pid, &wstatus, 0) == -1
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+ || ! WIFEXITED (wstatus)
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+ || WEXITSTATUS (wstatus) != 0)
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+ fatal ("%s FAILED", editor_program);
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+ }
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+ }
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+
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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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