* [ptxdist] [PATCH] bash: shellshock part 2 fix
@ 2014-09-29 9:45 Bruno Thomsen
2014-10-01 10:40 ` Michael Olbrich
0 siblings, 1 reply; 2+ messages in thread
From: Bruno Thomsen @ 2014-09-29 9:45 UTC (permalink / raw)
To: ptxdist; +Cc: bth
Fix CVE-2014-7169.
Applied patches 53 and 54 from version 3.2.
Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
---
patches/bash-3.2.48/0005-bash-3.2-patch53.patch | 51 +++++++
patches/bash-3.2.48/0006-bash-3.2-patch54.patch | 185 ++++++++++++++++++++++++
patches/bash-3.2.48/series | 2 +
3 files changed, 238 insertions(+)
create mode 100644 patches/bash-3.2.48/0005-bash-3.2-patch53.patch
create mode 100644 patches/bash-3.2.48/0006-bash-3.2-patch54.patch
diff --git a/patches/bash-3.2.48/0005-bash-3.2-patch53.patch b/patches/bash-3.2.48/0005-bash-3.2-patch53.patch
new file mode 100644
index 0000000..cad5435
--- /dev/null
+++ b/patches/bash-3.2.48/0005-bash-3.2-patch53.patch
@@ -0,0 +1,51 @@
+From bb47ebbc22117d0dfcff43734b5eeb293b4249e7 Mon Sep 17 00:00:00 2001
+From: Bruno Thomsen <bth@kamstrup.dk>
+Date: Mon, 29 Sep 2014 10:18:41 +0200
+Subject: [PATCH] bash-3.2: patch 53
+
+Bash-Release: 3.2
+Patch-ID: bash32-053
+
+Bug-Reported-by: Tavis Ormandy <taviso@cmpxchg8b.com>
+Bug-Reference-ID:
+Bug-Reference-URL: http://twitter.com/taviso/statuses/514887394294652929
+
+Bug-Description:
+
+Under certain circumstances, bash can incorrectly save a lookahead character and
+return it on a subsequent call, even when reading a new line.
+
+Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
+---
+ parse.y | 2 ++
+ patchlevel.h | 2 +-
+ 2 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/parse.y b/parse.y
+index 8a2b081..6cb2bce 100644
+--- a/parse.y
++++ b/parse.y
+@@ -2503,6 +2503,8 @@ reset_parser ()
+ FREE (word_desc_to_read);
+ word_desc_to_read = (WORD_DESC *)NULL;
+
++ eol_ungetc_lookahead = 0;
++
+ last_read_token = '\n';
+ token_to_read = '\n';
+ }
+diff --git a/patchlevel.h b/patchlevel.h
+index a2d65b2..e5d74f3 100644
+--- a/patchlevel.h
++++ b/patchlevel.h
+@@ -25,6 +25,6 @@
+ regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
+ looks for to find the patch level (for the sccs version string). */
+
+-#define PATCHLEVEL 52
++#define PATCHLEVEL 53
+
+ #endif /* _PATCHLEVEL_H_ */
+--
+1.9.1
+
diff --git a/patches/bash-3.2.48/0006-bash-3.2-patch54.patch b/patches/bash-3.2.48/0006-bash-3.2-patch54.patch
new file mode 100644
index 0000000..0b7e14d
--- /dev/null
+++ b/patches/bash-3.2.48/0006-bash-3.2-patch54.patch
@@ -0,0 +1,185 @@
+From 3daa4e268f15c66675cccc4e17c901194ca19199 Mon Sep 17 00:00:00 2001
+From: Bruno Thomsen <bth@kamstrup.dk>
+Date: Mon, 29 Sep 2014 10:36:58 +0200
+Subject: [PATCH] bash-3.2: patch 54
+
+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.
+
+Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
+---
+ patchlevel.h | 2 +-
+ variables.c | 80 +++++++++++++++++++++++++++++++++++++++++++++---------------
+ 2 files changed, 61 insertions(+), 21 deletions(-)
+
+diff --git a/patchlevel.h b/patchlevel.h
+index e5d74f3..d449c7c 100644
+--- a/patchlevel.h
++++ b/patchlevel.h
+@@ -25,6 +25,6 @@
+ regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
+ looks for to find the patch level (for the sccs version string). */
+
+-#define PATCHLEVEL 53
++#define PATCHLEVEL 54
+
+ #endif /* _PATCHLEVEL_H_ */
+diff --git a/variables.c b/variables.c
+index eb80326..76501cf 100644
+--- a/variables.c
++++ b/variables.c
+@@ -74,6 +74,11 @@
+
+ #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;
+
+ /* Variables used here and defined in other files. */
+@@ -241,7 +246,7 @@ static void push_temp_var __P((PTR_T));
+ static void propagate_temp_var __P((PTR_T));
+ 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 *));
+ static char **make_func_export_array __P((void));
+@@ -309,27 +314,41 @@ initialize_shell_variables (env, privmode)
+
+ /* 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));
+ array_needs_making = 1;
+ }
+ 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)
+ # if 0
+@@ -2207,7 +2226,7 @@ assign_in_env (word)
+ var->context = variable_context; /* XXX */
+
+ INVALIDATE_EXPORTSTR (var);
+- var->exportstr = mk_env_string (name, value);
++ var->exportstr = mk_env_string (name, value, 0);
+
+ array_needs_making = 1;
+
+@@ -2998,21 +3017,42 @@ merge_temporary_env ()
+ /* **************************************************************** */
+
+ 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);
+ }
+
+@@ -3087,7 +3127,7 @@ make_env_array_from_var_list (vars)
+ /* Gee, I'd like to get away with not using savestring() if we're
+ 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)
+ SAVE_EXPORTSTR (var, list[list_index]);
+--
+1.9.1
+
diff --git a/patches/bash-3.2.48/series b/patches/bash-3.2.48/series
index 0ede824..9ae2d65 100644
--- a/patches/bash-3.2.48/series
+++ b/patches/bash-3.2.48/series
@@ -2,3 +2,5 @@
0002-bash-3.2-patch50.patch
0003-bash-3.2-patch51.patch
0004-bash-3.2-patch52.patch
+0005-bash-3.2-patch53.patch
+0006-bash-3.2-patch54.patch
--
1.9.1
--
ptxdist mailing list
ptxdist@pengutronix.de
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ptxdist] [PATCH] bash: shellshock part 2 fix
2014-09-29 9:45 [ptxdist] [PATCH] bash: shellshock part 2 fix Bruno Thomsen
@ 2014-10-01 10:40 ` Michael Olbrich
0 siblings, 0 replies; 2+ messages in thread
From: Michael Olbrich @ 2014-10-01 10:40 UTC (permalink / raw)
To: ptxdist
On Mon, Sep 29, 2014 at 11:45:10AM +0200, Bruno Thomsen wrote:
> Fix CVE-2014-7169.
> Applied patches 53 and 54 from version 3.2.
>
> Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
Thanks. I've applied both patches.
Michael
> ---
> patches/bash-3.2.48/0005-bash-3.2-patch53.patch | 51 +++++++
> patches/bash-3.2.48/0006-bash-3.2-patch54.patch | 185 ++++++++++++++++++++++++
> patches/bash-3.2.48/series | 2 +
> 3 files changed, 238 insertions(+)
> create mode 100644 patches/bash-3.2.48/0005-bash-3.2-patch53.patch
> create mode 100644 patches/bash-3.2.48/0006-bash-3.2-patch54.patch
>
> diff --git a/patches/bash-3.2.48/0005-bash-3.2-patch53.patch b/patches/bash-3.2.48/0005-bash-3.2-patch53.patch
> new file mode 100644
> index 0000000..cad5435
> --- /dev/null
> +++ b/patches/bash-3.2.48/0005-bash-3.2-patch53.patch
> @@ -0,0 +1,51 @@
> +From bb47ebbc22117d0dfcff43734b5eeb293b4249e7 Mon Sep 17 00:00:00 2001
> +From: Bruno Thomsen <bth@kamstrup.dk>
> +Date: Mon, 29 Sep 2014 10:18:41 +0200
> +Subject: [PATCH] bash-3.2: patch 53
> +
> +Bash-Release: 3.2
> +Patch-ID: bash32-053
> +
> +Bug-Reported-by: Tavis Ormandy <taviso@cmpxchg8b.com>
> +Bug-Reference-ID:
> +Bug-Reference-URL: http://twitter.com/taviso/statuses/514887394294652929
> +
> +Bug-Description:
> +
> +Under certain circumstances, bash can incorrectly save a lookahead character and
> +return it on a subsequent call, even when reading a new line.
> +
> +Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
> +---
> + parse.y | 2 ++
> + patchlevel.h | 2 +-
> + 2 files changed, 3 insertions(+), 1 deletion(-)
> +
> +diff --git a/parse.y b/parse.y
> +index 8a2b081..6cb2bce 100644
> +--- a/parse.y
> ++++ b/parse.y
> +@@ -2503,6 +2503,8 @@ reset_parser ()
> + FREE (word_desc_to_read);
> + word_desc_to_read = (WORD_DESC *)NULL;
> +
> ++ eol_ungetc_lookahead = 0;
> ++
> + last_read_token = '\n';
> + token_to_read = '\n';
> + }
> +diff --git a/patchlevel.h b/patchlevel.h
> +index a2d65b2..e5d74f3 100644
> +--- a/patchlevel.h
> ++++ b/patchlevel.h
> +@@ -25,6 +25,6 @@
> + regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
> + looks for to find the patch level (for the sccs version string). */
> +
> +-#define PATCHLEVEL 52
> ++#define PATCHLEVEL 53
> +
> + #endif /* _PATCHLEVEL_H_ */
> +--
> +1.9.1
> +
> diff --git a/patches/bash-3.2.48/0006-bash-3.2-patch54.patch b/patches/bash-3.2.48/0006-bash-3.2-patch54.patch
> new file mode 100644
> index 0000000..0b7e14d
> --- /dev/null
> +++ b/patches/bash-3.2.48/0006-bash-3.2-patch54.patch
> @@ -0,0 +1,185 @@
> +From 3daa4e268f15c66675cccc4e17c901194ca19199 Mon Sep 17 00:00:00 2001
> +From: Bruno Thomsen <bth@kamstrup.dk>
> +Date: Mon, 29 Sep 2014 10:36:58 +0200
> +Subject: [PATCH] bash-3.2: patch 54
> +
> +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.
> +
> +Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
> +---
> + patchlevel.h | 2 +-
> + variables.c | 80 +++++++++++++++++++++++++++++++++++++++++++++---------------
> + 2 files changed, 61 insertions(+), 21 deletions(-)
> +
> +diff --git a/patchlevel.h b/patchlevel.h
> +index e5d74f3..d449c7c 100644
> +--- a/patchlevel.h
> ++++ b/patchlevel.h
> +@@ -25,6 +25,6 @@
> + regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
> + looks for to find the patch level (for the sccs version string). */
> +
> +-#define PATCHLEVEL 53
> ++#define PATCHLEVEL 54
> +
> + #endif /* _PATCHLEVEL_H_ */
> +diff --git a/variables.c b/variables.c
> +index eb80326..76501cf 100644
> +--- a/variables.c
> ++++ b/variables.c
> +@@ -74,6 +74,11 @@
> +
> + #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;
> +
> + /* Variables used here and defined in other files. */
> +@@ -241,7 +246,7 @@ static void push_temp_var __P((PTR_T));
> + static void propagate_temp_var __P((PTR_T));
> + 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 *));
> + static char **make_func_export_array __P((void));
> +@@ -309,27 +314,41 @@ initialize_shell_variables (env, privmode)
> +
> + /* 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));
> + array_needs_making = 1;
> + }
> + 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)
> + # if 0
> +@@ -2207,7 +2226,7 @@ assign_in_env (word)
> + var->context = variable_context; /* XXX */
> +
> + INVALIDATE_EXPORTSTR (var);
> +- var->exportstr = mk_env_string (name, value);
> ++ var->exportstr = mk_env_string (name, value, 0);
> +
> + array_needs_making = 1;
> +
> +@@ -2998,21 +3017,42 @@ merge_temporary_env ()
> + /* **************************************************************** */
> +
> + 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);
> + }
> +
> +@@ -3087,7 +3127,7 @@ make_env_array_from_var_list (vars)
> + /* Gee, I'd like to get away with not using savestring() if we're
> + 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)
> + SAVE_EXPORTSTR (var, list[list_index]);
> +--
> +1.9.1
> +
> diff --git a/patches/bash-3.2.48/series b/patches/bash-3.2.48/series
> index 0ede824..9ae2d65 100644
> --- a/patches/bash-3.2.48/series
> +++ b/patches/bash-3.2.48/series
> @@ -2,3 +2,5 @@
> 0002-bash-3.2-patch50.patch
> 0003-bash-3.2-patch51.patch
> 0004-bash-3.2-patch52.patch
> +0005-bash-3.2-patch53.patch
> +0006-bash-3.2-patch54.patch
> --
> 1.9.1
>
>
> --
> ptxdist mailing list
> ptxdist@pengutronix.de
>
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2014-09-29 9:45 [ptxdist] [PATCH] bash: shellshock part 2 fix Bruno Thomsen
2014-10-01 10:40 ` Michael Olbrich
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