d8173f21f7
* gnu/packages/patches/perl-CVE-2016-2381.patch: New file. * gnu-system.am (dist_patch_DATA): Add it. * gnu/packages/perl.scm (perl)[replacement]: New field. (perl-fixed): New variable. * gnu/packages/commencement.scm (perl-boot0)[replacement]: New field.
117 lines
3.9 KiB
Diff
117 lines
3.9 KiB
Diff
Fix CVE-2016-2381 (ambiguous handling of duplicated environment variables).
|
|
|
|
Copied from upstream:
|
|
http://perl5.git.perl.org/perl.git/commit/ae37b791a73a9e78dedb89fb2429d2628cf58076
|
|
|
|
References:
|
|
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2381
|
|
http://www.nntp.perl.org/group/perl.perl5.porters/2016/03/msg234747.html
|
|
https://security-tracker.debian.org/tracker/CVE-2016-2381
|
|
|
|
---
|
|
|
|
From 1237ea93fb2475a5ae576d5ee1358a5bb4ebe426 Mon Sep 17 00:00:00 2001
|
|
From: Tony Cook <tony@develop-help.com>
|
|
Date: Wed, 27 Jan 2016 11:52:15 +1100
|
|
Subject: 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.
|
|
|
|
Patch-Name: fixes/CVE-2016-2381_duplicate_env.diff
|
|
---
|
|
perl.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
|
|
1 file changed, 49 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/perl.c b/perl.c
|
|
index 67d32ce..26aeb91 100644
|
|
--- a/perl.c
|
|
+++ b/perl.c
|
|
@@ -4277,23 +4277,70 @@ 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 */
|