[Buildroot] [PATCH] ghostscript: add upstream security fixes for CVE-2017-8291

[Peter Korsgaard <peter@korsgaard.com>]

CVE-2017-8291 - Artifex Ghostscript through 2017-04-26 allows -dSAFER bypass
and remote command execution via a "/OutputFile (%pipe%" substring in a
crafted .eps document that is an input to the gs program, as exploited in
the wild in April 2017.

For more details, see https://bugzilla.suse.com/show_bug.cgi?id=1036453

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 ...-697799-have-.eqproc-check-its-parameters.patch | 33 ++++++++++++
 ...7799-have-.rsdparams-check-its-parameters.patch | 62 ++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 package/ghostscript/0003-Bug-697799-have-.eqproc-check-its-parameters.patch
 create mode 100644 package/ghostscript/0004-Bug-697799-have-.rsdparams-check-its-parameters.patch

diff --git a/package/ghostscript/0003-Bug-697799-have-.eqproc-check-its-parameters.patch b/package/ghostscript/0003-Bug-697799-have-.eqproc-check-its-parameters.patch
new file mode 100644
index 000000000..becdc6605
--- /dev/null
+++ b/package/ghostscript/0003-Bug-697799-have-.eqproc-check-its-parameters.patch
@@ -0,0 +1,33 @@
+From 4f83478c88c2e05d6e8d79ca4557eb039354d2f3 Mon Sep 17 00:00:00 2001
+From: Chris Liddell <chris.liddell@artifex.com>
+Date: Thu, 27 Apr 2017 13:03:33 +0100
+Subject: [PATCH] Bug 697799: have .eqproc check its parameters
+
+The Ghostscript custom operator .eqproc was not check the number or type of
+the parameters it was given.
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+---
+ psi/zmisc3.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/psi/zmisc3.c b/psi/zmisc3.c
+index 54b304246..37293ff4b 100644
+--- a/psi/zmisc3.c
++++ b/psi/zmisc3.c
+@@ -56,6 +56,12 @@ zeqproc(i_ctx_t *i_ctx_p)
+     ref2_t stack[MAX_DEPTH + 1];
+     ref2_t *top = stack;
+ 
++    if (ref_stack_count(&o_stack) < 2)
++        return_error(gs_error_stackunderflow);
++    if (!r_is_array(op - 1) || !r_is_array(op)) {
++        return_error(gs_error_typecheck);
++    }
++
+     make_array(&stack[0].proc1, 0, 1, op - 1);
+     make_array(&stack[0].proc2, 0, 1, op);
+     for (;;) {
+-- 
+2.11.0
+
diff --git a/package/ghostscript/0004-Bug-697799-have-.rsdparams-check-its-parameters.patch b/package/ghostscript/0004-Bug-697799-have-.rsdparams-check-its-parameters.patch
new file mode 100644
index 000000000..9ba170b31
--- /dev/null
+++ b/package/ghostscript/0004-Bug-697799-have-.rsdparams-check-its-parameters.patch
@@ -0,0 +1,62 @@
+From 04b37bbce174eed24edec7ad5b920eb93db4d47d Mon Sep 17 00:00:00 2001
+From: Chris Liddell <chris.liddell@artifex.com>
+Date: Thu, 27 Apr 2017 13:21:31 +0100
+Subject: [PATCH] Bug 697799: have .rsdparams check its parameters
+
+The Ghostscript internal operator .rsdparams wasn't checking the number or
+type of the operands it was being passed. Do so.
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+---
+ psi/zfrsd.c | 22 +++++++++++++++-------
+ 1 file changed, 15 insertions(+), 7 deletions(-)
+
+diff --git a/psi/zfrsd.c b/psi/zfrsd.c
+index 191107d8a..950588d69 100644
+--- a/psi/zfrsd.c
++++ b/psi/zfrsd.c
+@@ -49,13 +49,20 @@ zrsdparams(i_ctx_t *i_ctx_p)
+     ref *pFilter;
+     ref *pDecodeParms;
+     int Intent = 0;
+-    bool AsyncRead;
++    bool AsyncRead = false;
+     ref empty_array, filter1_array, parms1_array;
+     uint i;
+-    int code;
++    int code = 0;
++
++    if (ref_stack_count(&o_stack) < 1)
++        return_error(gs_error_stackunderflow);
++    if (!r_has_type(op, t_dictionary) && !r_has_type(op, t_null)) {
++        return_error(gs_error_typecheck);
++    }
+ 
+     make_empty_array(&empty_array, a_readonly);
+-    if (dict_find_string(op, "Filter", &pFilter) > 0) {
++    if (r_has_type(op, t_dictionary)
++        && dict_find_string(op, "Filter", &pFilter) > 0) {
+         if (!r_is_array(pFilter)) {
+             if (!r_has_type(pFilter, t_name))
+                 return_error(gs_error_typecheck);
+@@ -94,12 +101,13 @@ zrsdparams(i_ctx_t *i_ctx_p)
+                 return_error(gs_error_typecheck);
+         }
+     }
+-    code = dict_int_param(op, "Intent", 0, 3, 0, &Intent);
++    if (r_has_type(op, t_dictionary))
++        code = dict_int_param(op, "Intent", 0, 3, 0, &Intent);
+     if (code < 0 && code != gs_error_rangecheck) /* out-of-range int is ok, use 0 */
+         return code;
+-    if ((code = dict_bool_param(op, "AsyncRead", false, &AsyncRead)) < 0
+-        )
+-        return code;
++    if (r_has_type(op, t_dictionary))
++        if ((code = dict_bool_param(op, "AsyncRead", false, &AsyncRead)) < 0)
++            return code;
+     push(1);
+     op[-1] = *pFilter;
+     if (pDecodeParms)
+-- 
+2.11.0
+
-- 
2.11.0