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c5269fd210
Backport fixes from pseudo master for an acl issue and more importantly, a segfault issue with bash which can be triggered by the recent useradd changes. (From OE-Core rev: 949214761998a93fc6b8b009f1cdad0db3bfa5db) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
49 lines
1.5 KiB
Diff
49 lines
1.5 KiB
Diff
From b6b68db896f9963558334aff7fca61adde4ec10f Mon Sep 17 00:00:00 2001
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From: Seebs <seebs@seebs.net>
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Date: Thu, 13 Apr 2017 18:12:01 -0500
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Subject: Prevent bash from segfaulting when unloading pseudo
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bash's extremely fancy internal awareness of how the environment looks
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means that, if you directly call the underlying libc "unsetenv" on
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a variable, bash can end up trying to access a null pointer. Fixing
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this generically is actually rather hard; you can't really avoid
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writing to environ on fork() or popen(), even if you change all
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execv*() functions to use the execv*e() variants. So for now, instead
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of unsetting the variable, set it to an empty string.
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Thanks to Saur in IRC for spotting this and helping debug it.
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Signed-off-by: Seebs <seebs@seebs.net>
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Upstream-Status: Backport
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diff --git a/ChangeLog.txt b/ChangeLog.txt
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index a2d30e9..8ba1ffa 100644
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--- a/ChangeLog.txt
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+++ b/ChangeLog.txt
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@@ -1,3 +1,8 @@
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+2017-04-13:
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+ * (seebs) don't unset LD_PRELOAD or the like, because if you
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+ do that, bash can segfault because it "knows" how many
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+ fields are in environ.
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+
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2017-02-24:
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* (seebs) import posix_acl_default fix from Anton Gerasimov
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<anton@advancedtelematic.com>
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diff --git a/pseudo_util.c b/pseudo_util.c
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index 172990b..6a1fac2 100644
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--- a/pseudo_util.c
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+++ b/pseudo_util.c
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@@ -844,7 +844,7 @@ void pseudo_dropenv() {
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if (ld_preload && strlen(ld_preload)) {
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SETENV(PRELINK_LIBRARIES, ld_preload, 1);
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} else {
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- UNSETENV(PRELINK_LIBRARIES);
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+ SETENV(PRELINK_LIBRARIES, "", 1);
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}
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}
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}
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--
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cgit v0.10.2
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