linux-kernel - Re: [PATCH v2] MODSIGN: do not send garbage to stderr when enabling modules signature

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Date:	Wed, 10 Apr 2013 20:02:10 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	David Cohen <david.a.cohen@...el.com>, dhowells@...hat.com
Cc:	linux-kernel@...r.kernel.org, mark.gross@...el.com,
	David Cohen <david.a.cohen@...el.com>
Subject: Re: [PATCH v2] MODSIGN: do not send garbage to stderr when enabling modules signature

David Cohen <david.a.cohen@...el.com> writes:
> openssl may send garbage to stderr when generating X.509 key pair for
> modules signature regardless there was an error or not. It makes more
> difficult to create scripts based on kernel error/warning messages.
>
> When compiling kernel with -jN (N > 1), all warning/error messages
> printed while openssl is generating key pair may get mixed dots and
> other symbols openssl sends to stderr. This patch makes sure openssl
> logs go to default stdout.

Ah!  Not garbage, but it writes progress dots and status messages to
stderr?

I trimmed your commit message as shown below.

Thanks!
Rusty.

From: David Cohen <david.a.cohen@...el.com>
Subject: MODSIGN: do not send garbage to stderr when enabling modules signature

When compiling kernel with -jN (N > 1), all warning/error messages
printed while openssl is generating key pair may get mixed dots and
other symbols openssl sends to stderr. This patch makes sure openssl
logs go to default stdout.

Example of the garbage on stderr:

crypto/anubis.c:581: warning: ‘inter’ is used uninitialized in this function
Generating a 4096 bit RSA private key
.........
drivers/gpu/drm/i915/i915_gem_gtt.c: In function ‘gen6_ggtt_insert_entries’:
drivers/gpu/drm/i915/i915_gem_gtt.c:440: warning: ‘addr’ may be used uninitialized in this function
.net/mac80211/tx.c: In function ‘ieee80211_subif_start_xmit’:
net/mac80211/tx.c:1780: warning: ‘chanctx_conf’ may be used uninitialized in this function
..drivers/isdn/hardware/mISDN/hfcpci.c: In function ‘hfcpci_softirq’:
.....drivers/isdn/hardware/mISDN/hfcpci.c:2298: warning: ignoring return value of ‘driver_for_each_device’, declared with attribute warn_unused_result

Signed-off-by: David Cohen <david.a.cohen@...el.com>
Reviewed-by: mark gross <mark.gross@...el.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 kernel/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/Makefile b/kernel/Makefile
index bbde5f1..5a51e6c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -175,7 +175,7 @@ signing_key.priv signing_key.x509: x509.genkey
 	openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
 		-batch -x509 -config x509.genkey \
 		-outform DER -out signing_key.x509 \
-		-keyout signing_key.priv
+		-keyout signing_key.priv 2>&1
 	@echo "###"
 	@echo "### Key pair generated."
 	@echo "###"

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