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From cb6aa82dbc10d554f8d234e934ae7c77e39a3ce2 Mon Sep 17 00:00:00 2001
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From: Panu Matilainen <pmatilai@redhat.com>
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Date: Tue, 12 Jan 2021 13:35:23 +0200
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Subject: [PATCH] Unblock signals in forked scriptlets
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Since commit c5f82d3f6223ebd0c5cc0a07ea60393ae7284929 we've blocked
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most signals during transactions, which makes sense to rpm itself but
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the signal mask is inherited to childs and carried even across exec(),
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so all scriptlets are executing with those signals blocked as well.
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Which in turn does not make sense, the scriptlets could run stuff that
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actually depends on signal delivery (such as SIGALARM in RhBug:1913765).
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Unblock all signals for forked scriptlet execution (Lua scriptlets are
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totally different as they execute in-process for now)
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---
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lib/rpmscript.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/lib/rpmscript.c b/lib/rpmscript.c
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index 2ae3378f7..c69d29554 100644
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--- a/lib/rpmscript.c
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+++ b/lib/rpmscript.c
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@@ -152,6 +152,11 @@ static void doScriptExec(ARGV_const_t argv, ARGV_const_t prefixes,
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FD_t scriptFd, FD_t out)
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{
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int xx;
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+ sigset_t set;
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+
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+ /* Unmask all signals, the scripts may need them */
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+ sigfillset(&set);
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+ sigprocmask(SIG_UNBLOCK, &set, NULL);
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/* SIGPIPE is ignored in rpm, reset to default for the scriptlet */
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(void) signal(SIGPIPE, SIG_DFL);
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--
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2.29.2
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