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bash: Fix for exported function namespace change 

This is a followup patch to incomplete CVE-2014-6271 fix code execution via
specially-crafted environment

This patch changes the encoding bash uses for exported functions to avoid
clashes with shell variables and to avoid depending only on an environment
variable's contents to determine whether or not to interpret it as a shell
function.

(From OE-Core daisy rev: 6c51cc96d03df26d1c10867633e7a10dfbec7c45)

(From OE-Core rev: af1f65b57dbfcaf5fc7c254dce80ac55f3a632cb)

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Catalin Popeanga 2014-10-09 14:23:24 +02:00 committed by Holger Hans Peter Freyther
parent 7aab9b0784
commit ca6bbc3f99
4 changed files with 372 additions and 0 deletions
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158
meta/recipes-extended/bash/bash-3.2.48/Fix-for-bash-exported-function-namespace-change.patch Normal file
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@ -0,0 +1,158 @@
Fix for exported function namespace change
Upstream-Status: Backport
Downloaded from: http://ftp.gnu.org/gnu/bash/bash-3.2-patches/bash32-054
Author: Chet Ramey <chet.ramey@case.edu>
Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
BASH PATCH REPORT
=================
Bash-Release: 3.2
Patch-ID: bash32-054
Bug-Reported-by: Florian Weimer <fweimer@redhat.com>
Bug-Reference-ID:
Bug-Reference-URL:
Bug-Description:
This patch changes the encoding bash uses for exported functions to avoid
clashes with shell variables and to avoid depending only on an environment
variable's contents to determine whether or not to interpret it as a shell
function.
---
--- a/variables.c 2014-09-16 19:10:39.000000000 -0400
+++ b/variables.c 2014-09-27 21:02:08.000000000 -0400
@@ -75,4 +75,9 @@
#define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
+#define BASHFUNC_PREFIX "BASH_FUNC_"
+#define BASHFUNC_PREFLEN 10 /* == strlen(BASHFUNC_PREFIX */
+#define BASHFUNC_SUFFIX "%%"
+#define BASHFUNC_SUFFLEN 2 /* == strlen(BASHFUNC_SUFFIX) */
+
extern char **environ;
@@ -242,5 +247,5 @@
static void dispose_temporary_env __P((sh_free_func_t *));
-static inline char *mk_env_string __P((const char *, const char *));
+static inline char *mk_env_string __P((const char *, const char *, int));
static char **make_env_array_from_var_list __P((SHELL_VAR **));
static char **make_var_export_array __P((VAR_CONTEXT *));
@@ -310,19 +315,30 @@
/* If exported function, define it now. Don't import functions from
the environment in privileged mode. */
- if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4))
+ if (privmode == 0 && read_but_dont_execute == 0 &&
+ STREQN (BASHFUNC_PREFIX, name, BASHFUNC_PREFLEN) &&
+ STREQ (BASHFUNC_SUFFIX, name + char_index - BASHFUNC_SUFFLEN) &&
+ STREQN ("() {", string, 4))
{
+ size_t namelen;
+ char *tname; /* desired imported function name */
+
+ namelen = char_index - BASHFUNC_PREFLEN - BASHFUNC_SUFFLEN;
+
+ tname = name + BASHFUNC_PREFLEN; /* start of func name */
+ tname[namelen] = '\0'; /* now tname == func name */
+
string_length = strlen (string);
- temp_string = (char *)xmalloc (3 + string_length + char_index);
+ temp_string = (char *)xmalloc (namelen + string_length + 2);
- strcpy (temp_string, name);
- temp_string[char_index] = ' ';
- strcpy (temp_string + char_index + 1, string);
+ memcpy (temp_string, tname, namelen);
+ temp_string[namelen] = ' ';
+ memcpy (temp_string + namelen + 1, string, string_length + 1);
/* Don't import function names that are invalid identifiers from the
environment. */
- if (legal_identifier (name))
- parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
+ if (absolute_program (tname) == 0 && (posixly_correct == 0 || legal_identifier (tname)))
+ parse_and_execute (temp_string, tname, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
- if (temp_var = find_function (name))
+ if (temp_var = find_function (tname))
{
VSETATTR (temp_var, (att_exported|att_imported));
@@ -330,5 +346,8 @@
}
else
- report_error (_("error importing function definition for `%s'"), name);
+ report_error (_("error importing function definition for `%s'"), tname);
+
+ /* Restore original suffix */
+ tname[namelen] = BASHFUNC_SUFFIX[0];
}
#if defined (ARRAY_VARS)
@@ -2208,5 +2227,5 @@
INVALIDATE_EXPORTSTR (var);
- var->exportstr = mk_env_string (name, value);
+ var->exportstr = mk_env_string (name, value, 0);
array_needs_making = 1;
@@ -2999,19 +3018,40 @@
static inline char *
-mk_env_string (name, value)
+mk_env_string (name, value, isfunc)
const char *name, *value;
+ int isfunc;
{
- int name_len, value_len;
- char *p;
+ size_t name_len, value_len;
+ char *p, *q;
name_len = strlen (name);
value_len = STRLEN (value);
- p = (char *)xmalloc (2 + name_len + value_len);
- strcpy (p, name);
- p[name_len] = '=';
+
+ /* If we are exporting a shell function, construct the encoded function
+ name. */
+ if (isfunc && value)
+ {
+ p = (char *)xmalloc (BASHFUNC_PREFLEN + name_len + BASHFUNC_SUFFLEN + value_len + 2);
+ q = p;
+ memcpy (q, BASHFUNC_PREFIX, BASHFUNC_PREFLEN);
+ q += BASHFUNC_PREFLEN;
+ memcpy (q, name, name_len);
+ q += name_len;
+ memcpy (q, BASHFUNC_SUFFIX, BASHFUNC_SUFFLEN);
+ q += BASHFUNC_SUFFLEN;
+ }
+ else
+ {
+ p = (char *)xmalloc (2 + name_len + value_len);
+ memcpy (p, name, name_len);
+ q = p + name_len;
+ }
+
+ q[0] = '=';
if (value && *value)
- strcpy (p + name_len + 1, value);
+ memcpy (q + 1, value, value_len + 1);
else
- p[name_len + 1] = '\0';
+ q[1] = '\0';
+
return (p);
}
@@ -3088,5 +3128,5 @@
using the cached exportstr... */
list[list_index] = USE_EXPORTSTR ? savestring (value)
- : mk_env_string (var->name, value);
+ : mk_env_string (var->name, value, function_p (var));
if (USE_EXPORTSTR == 0)

212
meta/recipes-extended/bash/bash-4.2/Fix-for-bash-exported-function-namespace-change.patch Normal file
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@ -0,0 +1,212 @@
Fix for exported function namespace change
Upstream-Status: Backport
Downloaded from: http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-050
Author: Chet Ramey <chet.ramey@case.edu>
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
BASH PATCH REPORT
=================
Bash-Release: 4.2
Patch-ID: bash42-050
Bug-Reported-by: Florian Weimer <fweimer@redhat.com>
Bug-Reference-ID:
Bug-Reference-URL:
Bug-Description:
This patch changes the encoding bash uses for exported functions to avoid
clashes with shell variables and to avoid depending only on an environment
variable's contents to determine whether or not to interpret it as a shell
function.
Patch (apply with `patch -p0'):
*** ../bash-4.2.49/variables.c 2014-09-16 19:35:45.000000000 -0400
--- variables.c 2014-09-27 20:54:00.000000000 -0400
***************
*** 80,83 ****
--- 80,88 ----
#define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
+ #define BASHFUNC_PREFIX "BASH_FUNC_"
+ #define BASHFUNC_PREFLEN 10 /* == strlen(BASHFUNC_PREFIX */
+ #define BASHFUNC_SUFFIX "%%"
+ #define BASHFUNC_SUFFLEN 2 /* == strlen(BASHFUNC_SUFFIX) */
+
extern char **environ;
***************
*** 269,273 ****
static void dispose_temporary_env __P((sh_free_func_t *));
! static inline char *mk_env_string __P((const char *, const char *));
static char **make_env_array_from_var_list __P((SHELL_VAR **));
static char **make_var_export_array __P((VAR_CONTEXT *));
--- 274,278 ----
static void dispose_temporary_env __P((sh_free_func_t *));
! static inline char *mk_env_string __P((const char *, const char *, int));
static char **make_env_array_from_var_list __P((SHELL_VAR **));
static char **make_var_export_array __P((VAR_CONTEXT *));
***************
*** 339,357 ****
/* If exported function, define it now. Don't import functions from
the environment in privileged mode. */
! if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4))
{
string_length = strlen (string);
! temp_string = (char *)xmalloc (3 + string_length + char_index);
! strcpy (temp_string, name);
! temp_string[char_index] = ' ';
! strcpy (temp_string + char_index + 1, string);
/* Don't import function names that are invalid identifiers from the
environment. */
! if (legal_identifier (name))
! parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
! if (temp_var = find_function (name))
{
VSETATTR (temp_var, (att_exported|att_imported));
--- 344,373 ----
/* If exported function, define it now. Don't import functions from
the environment in privileged mode. */
! if (privmode == 0 && read_but_dont_execute == 0 &&
! STREQN (BASHFUNC_PREFIX, name, BASHFUNC_PREFLEN) &&
! STREQ (BASHFUNC_SUFFIX, name + char_index - BASHFUNC_SUFFLEN) &&
! STREQN ("() {", string, 4))
{
+ size_t namelen;
+ char *tname; /* desired imported function name */
+
+ namelen = char_index - BASHFUNC_PREFLEN - BASHFUNC_SUFFLEN;
+
+ tname = name + BASHFUNC_PREFLEN; /* start of func name */
+ tname[namelen] = '\0'; /* now tname == func name */
+
string_length = strlen (string);
! temp_string = (char *)xmalloc (namelen + string_length + 2);
! memcpy (temp_string, tname, namelen);
! temp_string[namelen] = ' ';
! memcpy (temp_string + namelen + 1, string, string_length + 1);
/* Don't import function names that are invalid identifiers from the
environment. */
! if (absolute_program (tname) == 0 && (posixly_correct == 0 || legal_identifier (tname)))
! parse_and_execute (temp_string, tname, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
! if (temp_var = find_function (tname))
{
VSETATTR (temp_var, (att_exported|att_imported));
***************
*** 359,363 ****
}
else
! report_error (_("error importing function definition for `%s'"), name);
}
#if defined (ARRAY_VARS)
--- 375,382 ----
}
else
! report_error (_("error importing function definition for `%s'"), tname);
!
! /* Restore original suffix */
! tname[namelen] = BASHFUNC_SUFFIX[0];
}
#if defined (ARRAY_VARS)
***************
*** 2538,2542 ****
INVALIDATE_EXPORTSTR (var);
! var->exportstr = mk_env_string (name, value);
array_needs_making = 1;
--- 2557,2561 ----
INVALIDATE_EXPORTSTR (var);
! var->exportstr = mk_env_string (name, value, 0);
array_needs_making = 1;
***************
*** 3390,3408 ****
static inline char *
! mk_env_string (name, value)
const char *name, *value;
{
! int name_len, value_len;
! char *p;
name_len = strlen (name);
value_len = STRLEN (value);
! p = (char *)xmalloc (2 + name_len + value_len);
! strcpy (p, name);
! p[name_len] = '=';
if (value && *value)
! strcpy (p + name_len + 1, value);
else
! p[name_len + 1] = '\0';
return (p);
}
--- 3409,3448 ----
static inline char *
! mk_env_string (name, value, isfunc)
const char *name, *value;
+ int isfunc;
{
! size_t name_len, value_len;
! char *p, *q;
name_len = strlen (name);
value_len = STRLEN (value);
!
! /* If we are exporting a shell function, construct the encoded function
! name. */
! if (isfunc && value)
! {
! p = (char *)xmalloc (BASHFUNC_PREFLEN + name_len + BASHFUNC_SUFFLEN + value_len + 2);
! q = p;
! memcpy (q, BASHFUNC_PREFIX, BASHFUNC_PREFLEN);
! q += BASHFUNC_PREFLEN;
! memcpy (q, name, name_len);
! q += name_len;
! memcpy (q, BASHFUNC_SUFFIX, BASHFUNC_SUFFLEN);
! q += BASHFUNC_SUFFLEN;
! }
! else
! {
! p = (char *)xmalloc (2 + name_len + value_len);
! memcpy (p, name, name_len);
! q = p + name_len;
! }
!
! q[0] = '=';
if (value && *value)
! memcpy (q + 1, value, value_len + 1);
else
! q[1] = '\0';
!
return (p);
}
***************
*** 3490,3494 ****
using the cached exportstr... */
list[list_index] = USE_EXPORTSTR ? savestring (value)
! : mk_env_string (var->name, value);
if (USE_EXPORTSTR == 0)
--- 3530,3534 ----
using the cached exportstr... */
list[list_index] = USE_EXPORTSTR ? savestring (value)
! : mk_env_string (var->name, value, function_p (var));
if (USE_EXPORTSTR == 0)

1
meta/recipes-extended/bash/bash_3.2.48.bb
View File

@ -14,6 +14,7 @@ SRC_URI = "${GNU_MIRROR}/bash/bash-${PV}.tar.gz;name=tarball \
file://test-output.patch \
file://cve-2014-6271.patch;striplevel=0 \
file://cve-2014-7169.patch \
file://Fix-for-bash-exported-function-namespace-change.patch \
file://run-ptest \
"

1
meta/recipes-extended/bash/bash_4.2.bb
View File

@ -23,6 +23,7 @@ SRC_URI = "${GNU_MIRROR}/bash/${BPN}-${PV}.tar.gz;name=tarball \
file://test-output.patch \
file://cve-2014-6271.patch;striplevel=0 \
file://cve-2014-7169.patch \
file://Fix-for-bash-exported-function-namespace-change.patch;striplevel=0 \
file://run-ptest \
"