bug#26431: [PATCH 1/2] gnu: pcre2: Patch CVE-2017-7186.

[Ludovic Courtès]

* gnu/packages/patches/pcre2-CVE-2017-7186.patch: New file.
* gnu/packages/pcre.scm (pcre2)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.
---
 gnu/local.mk                                   |  1 +
 gnu/packages/patches/pcre2-CVE-2017-7186.patch | 67 ++++++++++++++++++++++++++
 gnu/packages/pcre.scm                          |  3 +-
 3 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/pcre2-CVE-2017-7186.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index a8d006601..c3a65789a 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -825,6 +825,7 @@ dist_patch_DATA =                                           
\
   %D%/packages/patches/patchelf-rework-for-arm.patch           \
   %D%/packages/patches/patchutils-xfail-gendiff-tests.patch    \
   %D%/packages/patches/patch-hurd-path-max.patch               \
+  %D%/packages/patches/pcre2-CVE-2017-7186.patch               \
   %D%/packages/patches/perl-autosplit-default-time.patch       \
   %D%/packages/patches/perl-deterministic-ordering.patch       \
   %D%/packages/patches/perl-finance-quote-unuse-mozilla-ca.patch \
diff --git a/gnu/packages/patches/pcre2-CVE-2017-7186.patch 
b/gnu/packages/patches/pcre2-CVE-2017-7186.patch
new file mode 100644
index 000000000..482f07a1f
--- /dev/null
+++ b/gnu/packages/patches/pcre2-CVE-2017-7186.patch
@@ -0,0 +1,67 @@
+Upstream patch for <https://nvd.nist.gov/vuln/detail?vulnId=CVE-2017-7186>.
+
+--- trunk/src/pcre2_internal.h 2016/11/19 12:46:24     600
++++ trunk/src/pcre2_internal.h 2017/02/24 18:25:32     670
+@@ -1774,10 +1774,17 @@
+ /* UCD access macros */
+ 
+ #define UCD_BLOCK_SIZE 128
+-#define GET_UCD(ch) (PRIV(ucd_records) + \
++#define REAL_GET_UCD(ch) (PRIV(ucd_records) + \
+         PRIV(ucd_stage2)[PRIV(ucd_stage1)[(int)(ch) / UCD_BLOCK_SIZE] * \
+         UCD_BLOCK_SIZE + (int)(ch) % UCD_BLOCK_SIZE])
+ 
++#if PCRE2_CODE_UNIT_WIDTH == 32
++#define GET_UCD(ch) ((ch > MAX_UTF_CODE_POINT)? \
++  PRIV(dummy_ucd_record) : REAL_GET_UCD(ch))
++#else
++#define GET_UCD(ch) REAL_GET_UCD(ch)
++#endif
++
+ #define UCD_CHARTYPE(ch)    GET_UCD(ch)->chartype
+ #define UCD_SCRIPT(ch)      GET_UCD(ch)->script
+ #define UCD_CATEGORY(ch)    PRIV(ucp_gentype)[UCD_CHARTYPE(ch)]
+@@ -1834,6 +1841,9 @@
+ #define _pcre2_default_compile_context 
PCRE2_SUFFIX(_pcre2_default_compile_context_)
+ #define _pcre2_default_match_context   
PCRE2_SUFFIX(_pcre2_default_match_context_)
+ #define _pcre2_default_tables          PCRE2_SUFFIX(_pcre2_default_tables_)
++#if PCRE2_CODE_UNIT_WIDTH == 32
++#define _pcre2_dummy_ucd_record        PCRE2_SUFFIX(_pcre2_dummy_ucd_record_)
++#endif
+ #define _pcre2_hspace_list             PCRE2_SUFFIX(_pcre2_hspace_list_)
+ #define _pcre2_vspace_list             PCRE2_SUFFIX(_pcre2_vspace_list_)
+ #define _pcre2_ucd_caseless_sets       PCRE2_SUFFIX(_pcre2_ucd_caseless_sets_)
+@@ -1858,6 +1868,9 @@
+ extern const uint32_t                  PRIV(vspace_list)[];
+ extern const uint32_t                  PRIV(ucd_caseless_sets)[];
+ extern const ucd_record                PRIV(ucd_records)[];
++#if PCRE2_CODE_UNIT_WIDTH == 32
++extern const ucd_record                PRIV(dummy_ucd_record)[];
++#endif
+ extern const uint8_t                   PRIV(ucd_stage1)[];
+ extern const uint16_t                  PRIV(ucd_stage2)[];
+ extern const uint32_t                  PRIV(ucp_gbtable)[];
+
+--- trunk/src/pcre2_ucd.c      2015/07/17 15:44:51     316
++++ trunk/src/pcre2_ucd.c      2017/02/24 18:25:32     670
+@@ -41,6 +41,20 @@
+ 
+ const char *PRIV(unicode_version) = "8.0.0";
+ 
++/* If the 32-bit library is run in non-32-bit mode, character values
++greater than 0x10ffff may be encountered. For these we set up a
++special record. */
++
++#if PCRE2_CODE_UNIT_WIDTH == 32
++const ucd_record PRIV(dummy_ucd_record)[] = {{
++  ucp_Common,    /* script */
++  ucp_Cn,        /* type unassigned */
++  ucp_gbOther,   /* grapheme break property */
++  0,             /* case set */
++  0,             /* other case */
++  }};
++#endif
++
+ /* When recompiling tables with a new Unicode version, please check the
+ types in this structure definition from pcre2_internal.h (the actual
+ field names will be different):
diff --git a/gnu/packages/pcre.scm b/gnu/packages/pcre.scm
index 011a30dd3..9f610e59f 100644
--- a/gnu/packages/pcre.scm
+++ b/gnu/packages/pcre.scm
@@ -81,7 +81,8 @@ POSIX regular expression API.")
 
               (sha256
                (base32
-                "0vn5g0mkkp99mmzpissa06hpyj6pk9s4mlwbjqrjvw3ihy8rpiyz"))))
+                "0vn5g0mkkp99mmzpissa06hpyj6pk9s4mlwbjqrjvw3ihy8rpiyz"))
+              (patches (search-patches "pcre2-CVE-2017-7186.patch"))))
    (build-system gnu-build-system)
    (inputs `(("bzip2" ,bzip2)
              ("readline" ,readline)
-- 
2.12.2