* [PATCH 1/1] perl: fix CVE-2016-2381
2016-07-14 8:53 [PATCH 0/1] Backport patch to fix CVE-2016-2381 for perl kai.kang
@ 2016-07-14 8:53 ` kai.kang
0 siblings, 0 replies; 2+ messages in thread
From: kai.kang @ 2016-07-14 8:53 UTC (permalink / raw)
To: openembedded-core
From: Kai Kang <kai.kang@windriver.com>
Backport patch to fix CVE-2016-2381 from perl upstream:
http://perl5.git.perl.org/perl.git/commitdiff/ae37b791a73a9e78dedb89fb2429d2628cf58076
Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
.../perl/perl/perl-fix-CVE-2016-2381.patch | 113 +++++++++++++++++++++
meta/recipes-devtools/perl/perl_5.22.1.bb | 1 +
2 files changed, 114 insertions(+)
create mode 100644 meta/recipes-devtools/perl/perl/perl-fix-CVE-2016-2381.patch
diff --git a/meta/recipes-devtools/perl/perl/perl-fix-CVE-2016-2381.patch b/meta/recipes-devtools/perl/perl/perl-fix-CVE-2016-2381.patch
new file mode 100644
index 0000000..0033ae0
--- /dev/null
+++ b/meta/recipes-devtools/perl/perl/perl-fix-CVE-2016-2381.patch
@@ -0,0 +1,113 @@
+Upstream-Status: Backport
+
+Backport patch to fix CVE-2016-2381 from
+
+http://perl5.git.perl.org/perl.git/commitdiff/ae37b791a73a9e78dedb89fb2429d2628cf58076
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+---
+From: Tony Cook <tony@develop-help.com>
+Date: Wed, 27 Jan 2016 00:52:15 +0000 (+1100)
+Subject: remove duplicate environment variables from environ
+X-Git-Tag: v5.23.9~170
+X-Git-Url: http://perl5.git.perl.org/perl.git/commitdiff_plain/ae37b791a73a9e78dedb89fb2429d2628cf58076
+
+remove duplicate environment variables from environ
+
+If we see duplicate environment variables while iterating over
+environ[]:
+
+a) make sure we use the same value in %ENV that getenv() returns.
+
+Previously on a duplicate, %ENV would have the last entry for the name
+from environ[], but a typical getenv() would return the first entry.
+
+Rather than assuming all getenv() implementations return the first entry
+explicitly call getenv() to ensure they agree.
+
+b) remove duplicate entries from environ
+
+Previously if there was a duplicate definition for a name in environ[]
+setting that name in %ENV could result in an unsafe value being passed
+to a child process, so ensure environ[] has no duplicates.
+
+CVE-2016-2381
+---
+
+diff --git a/perl.c b/perl.c
+index 4a324c6..5c71fd0 100644
+--- a/perl.c
++++ b/perl.c
+@@ -4329,23 +4329,70 @@ S_init_postdump_symbols(pTHX_ int argc, char **argv, char **env)
+ }
+ if (env) {
+ char *s, *old_var;
++ STRLEN nlen;
+ SV *sv;
++ HV *dups = newHV();
++
+ for (; *env; env++) {
+ old_var = *env;
+
+ if (!(s = strchr(old_var,'=')) || s == old_var)
+ continue;
++ nlen = s - old_var;
+
+ #if defined(MSDOS) && !defined(DJGPP)
+ *s = '\0';
+ (void)strupr(old_var);
+ *s = '=';
+ #endif
+- sv = newSVpv(s+1, 0);
+- (void)hv_store(hv, old_var, s - old_var, sv, 0);
++ if (hv_exists(hv, old_var, nlen)) {
++ const char *name = savepvn(old_var, nlen);
++
++ /* make sure we use the same value as getenv(), otherwise code that
++ uses getenv() (like setlocale()) might see a different value to %ENV
++ */
++ sv = newSVpv(PerlEnv_getenv(name), 0);
++
++ /* keep a count of the dups of this name so we can de-dup environ later */
++ if (hv_exists(dups, name, nlen))
++ ++SvIVX(*hv_fetch(dups, name, nlen, 0));
++ else
++ (void)hv_store(dups, name, nlen, newSViv(1), 0);
++
++ Safefree(name);
++ }
++ else {
++ sv = newSVpv(s+1, 0);
++ }
++ (void)hv_store(hv, old_var, nlen, sv, 0);
+ if (env_is_not_environ)
+ mg_set(sv);
+ }
++ if (HvKEYS(dups)) {
++ /* environ has some duplicate definitions, remove them */
++ HE *entry;
++ hv_iterinit(dups);
++ while ((entry = hv_iternext_flags(dups, 0))) {
++ STRLEN nlen;
++ const char *name = HePV(entry, nlen);
++ IV count = SvIV(HeVAL(entry));
++ IV i;
++ SV **valp = hv_fetch(hv, name, nlen, 0);
++
++ assert(valp);
++
++ /* try to remove any duplicate names, depending on the
++ * implementation used in my_setenv() the iteration might
++ * not be necessary, but let's be safe.
++ */
++ for (i = 0; i < count; ++i)
++ my_setenv(name, 0);
++
++ /* and set it back to the value we set $ENV{name} to */
++ my_setenv(name, SvPV_nolen(*valp));
++ }
++ }
++ SvREFCNT_dec_NN(dups);
+ }
+ #endif /* USE_ENVIRON_ARRAY */
+ #endif /* !PERL_MICRO */
diff --git a/meta/recipes-devtools/perl/perl_5.22.1.bb b/meta/recipes-devtools/perl/perl_5.22.1.bb
index 3bd0a6d..04a2b6f 100644
--- a/meta/recipes-devtools/perl/perl_5.22.1.bb
+++ b/meta/recipes-devtools/perl/perl_5.22.1.bb
@@ -65,6 +65,7 @@ SRC_URI += " \
file://perl-errno-generation-gcc5.patch \
file://perl-fix-conflict-between-skip_all-and-END.patch \
file://perl-test-customized.patch \
+ file://perl-fix-CVE-2016-2381.patch \
"
# Fix test case issues
--
2.6.1
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