[OE-core] [PATCH 1/1] cpio: fix CVE-2015-1197
Robert Yang
liezhi.yang at windriver.com
Thu Mar 26 09:18:09 UTC 2015
Additional directory traversal vulnerability via symlinks
cpio CVE-2015-1197
Initial report:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774669
Upstream report:
https://lists.gnu.org/archive/html/bug-cpio/2015-01/msg00000.html
And fix the indent in SRC_URI.
[YOCTO #7182]
Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
---
.../cpio/cpio-2.11/cpio-CVE-2015-1197.patch | 154 ++++++++++++++++++++
meta/recipes-extended/cpio/cpio_2.11.bb | 3 +-
2 files changed, 156 insertions(+), 1 deletion(-)
create mode 100644 meta/recipes-extended/cpio/cpio-2.11/cpio-CVE-2015-1197.patch
diff --git a/meta/recipes-extended/cpio/cpio-2.11/cpio-CVE-2015-1197.patch b/meta/recipes-extended/cpio/cpio-2.11/cpio-CVE-2015-1197.patch
new file mode 100644
index 0000000..b54afb8
--- /dev/null
+++ b/meta/recipes-extended/cpio/cpio-2.11/cpio-CVE-2015-1197.patch
@@ -0,0 +1,154 @@
+Description: CVE-2015-1197
+ Apply patch by Vitezslav Cizek of SuSE to fix CVE-2015-1197.
+ Upstream is dormant or no longer existing. To restore the old
+ behaviour use --extract-over-symlinks (Closes: #774669)
+ This issue has been discovered by Alexander Cherepanov.
+Author: Vitezslav Cizek <vcizek at suse.cz>
+Bug-Debian: https://bugs.debian.org/774669
+
+Upstream-Status: Backport
+
+Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
+
+--- cpio-2.11+dfsg.orig/doc/cpio.1
++++ cpio-2.11+dfsg/doc/cpio.1
+@@ -22,6 +22,7 @@ cpio \- copy files to and from archives
+ [\-\-owner=[user][:.][group]] [\-\-no-preserve-owner] [\-\-message=message]
+ [\-\-force\-local] [\-\-no\-absolute\-filenames] [\-\-sparse]
+ [\-\-only\-verify\-crc] [\-\-to\-stdout] [\-\-quiet] [\-\-rsh-command=command]
++[\-\-extract\-over\-symlinks]
+ [\-\-help] [\-\-version] [pattern...] [< archive]
+
+ .B cpio
+--- cpio-2.11+dfsg.orig/src/copyin.c
++++ cpio-2.11+dfsg/src/copyin.c
+@@ -700,6 +700,51 @@ copyin_link (struct cpio_file_stat *file
+ free (link_name);
+ }
+
++
++static int
++path_contains_symlink(char *path)
++{
++ struct stat st;
++ char *slash;
++ char *nextslash;
++
++ /* we got NULL pointer or empty string */
++ if (!path || !*path) {
++ return false;
++ }
++
++ slash = path;
++
++ while ((nextslash = strchr(slash + 1, '/')) != NULL) {
++ slash = nextslash;
++ *slash = '\0';
++
++ if (lstat(path, &st) != 0) {
++ if (errno == ELOOP) {
++ /* ELOOP - too many symlinks */
++ *slash = '/';
++ return true;
++ } else if (errno == ENOMEM) {
++ /* No memory for lstat - terminate */
++ xalloc_die();
++ } else {
++ /* cannot lstat path - give up */
++ *slash = '/';
++ return false;
++ }
++ }
++
++ if (S_ISLNK(st.st_mode)) {
++ *slash = '/';
++ return true;
++ }
++
++ *slash = '/';
++ }
++
++ return false;
++}
++
+ static void
+ copyin_file (struct cpio_file_stat *file_hdr, int in_file_des)
+ {
+@@ -1471,6 +1516,23 @@ process_copy_in ()
+ {
+ /* Copy the input file into the directory structure. */
+
++ /* Can we write files over symlinks? */
++ if (!extract_over_symlinks)
++ {
++ if (path_contains_symlink(file_hdr.c_name))
++ {
++ /* skip the file */
++ /*
++ fprintf(stderr, "Can't write over symlinks. Skipping %s\n", file_hdr.c_name);
++ tape_toss_input (in_file_des, file_hdr.c_filesize);
++ tape_skip_padding (in_file_des, file_hdr.c_filesize);
++ continue;
++ */
++ /* terminate */
++ error (1, 0, _("Can't write over symlinks: %s\n"), file_hdr.c_name);
++ }
++ }
++
+ /* Do we need to rename the file? */
+ if (rename_flag || rename_batch_file)
+ {
+--- cpio-2.11+dfsg.orig/src/extern.h
++++ cpio-2.11+dfsg/src/extern.h
+@@ -95,6 +95,7 @@ extern char input_is_special;
+ extern char output_is_special;
+ extern char input_is_seekable;
+ extern char output_is_seekable;
++extern bool extract_over_symlinks;
+ extern int (*xstat) ();
+ extern void (*copy_function) ();
+
+--- cpio-2.11+dfsg.orig/src/global.c
++++ cpio-2.11+dfsg/src/global.c
+@@ -187,6 +187,9 @@ bool to_stdout_option = false;
+ /* The name this program was run with. */
+ char *program_name;
+
++/* Extract files over symbolic links */
++bool extract_over_symlinks;
++
+ /* A pointer to either lstat or stat, depending on whether
+ dereferencing of symlinks is done for input files. */
+ int (*xstat) ();
+--- cpio-2.11+dfsg.orig/src/main.c
++++ cpio-2.11+dfsg/src/main.c
+@@ -57,7 +57,8 @@ enum cpio_options {
+ FORCE_LOCAL_OPTION,
+ DEBUG_OPTION,
+ BLOCK_SIZE_OPTION,
+- TO_STDOUT_OPTION
++ TO_STDOUT_OPTION,
++ EXTRACT_OVER_SYMLINKS
+ };
+
+ const char *program_authors[] =
+@@ -222,6 +223,8 @@ static struct argp_option options[] = {
+ N_("Create leading directories where needed"), GRID+1 },
+ {"no-preserve-owner", NO_PRESERVE_OWNER_OPTION, 0, 0,
+ N_("Do not change the ownership of the files"), GRID+1 },
++ {"extract-over-symlinks", EXTRACT_OVER_SYMLINKS, 0, 0,
++ N_("Force writing over symbolic links"), GRID+1 },
+ {"unconditional", 'u', NULL, 0,
+ N_("Replace all files unconditionally"), GRID+1 },
+ {"sparse", SPARSE_OPTION, NULL, 0,
+@@ -412,6 +415,10 @@ crc newc odc bin ustar tar (all-caps als
+ no_chown_flag = true;
+ break;
+
++ case EXTRACT_OVER_SYMLINKS: /* --extract-over-symlinks */
++ extract_over_symlinks = true;
++ break;
++
+ case 'o': /* Copy-out mode. */
+ if (copy_function != 0)
+ error (PAXEXIT_FAILURE, 0, _("Mode already defined"));
diff --git a/meta/recipes-extended/cpio/cpio_2.11.bb b/meta/recipes-extended/cpio/cpio_2.11.bb
index c42db6f..053888f 100644
--- a/meta/recipes-extended/cpio/cpio_2.11.bb
+++ b/meta/recipes-extended/cpio/cpio_2.11.bb
@@ -6,7 +6,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=f27defe1e96c2e1ecd4e0c9be8967949"
PR = "r5"
SRC_URI += "file://remove-gets.patch \
- file://fix-memory-overrun.patch \
+ file://fix-memory-overrun.patch \
+ file://cpio-CVE-2015-1197.patch \
"
SRC_URI[md5sum] = "1112bb6c45863468b5496ba128792f6c"
--
1.7.9.5
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