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From:   Helge Deller <deller@gmx.de>
To:     linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] x86/fault: Dump command line of faulting process to syslog
Date:   Mon,  1 Aug 2022 17:20:16 +0200
Message-Id: <20220801152016.36498-4-deller@gmx.de>
In-Reply-To: <20220801152016.36498-1-deller@gmx.de>
References: <20220801152016.36498-1-deller@gmx.de>
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If a process segfaults, include the command line of the faulting process
in the syslog.

In the example below, the "crash" program (which simply writes zero to add=
ress 0)
was called with the parameters "this is a test":

 crash[2326]: segfault at 0 ip 0000561a7969c12e sp 00007ffe97a05630 error =
6 in crash[561a7969c000+1000]
 crash[2326] cmdline: ./crash this is a test
 Code: 68 ff ff ff c6 05 19 2f 00 00 01 5d c3 0f 1f 80 00 00 00 00 c3 0f 1=
f 80 00 00 00 00 e9 7b ff ff ff 55 48 89 e5 b8 00 00 00 00 <c7> 00 01 00 0=
0 00 b8 00 00 00 00 5d c3 0f 1f 44 00 00 41 57 4c 8d

Signed-off-by: Helge Deller <deller@gmx.de>
=2D--
 arch/x86/mm/fault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index fad8faa29d04..d4e21c402e29 100644
=2D-- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -784,6 +784,8 @@ show_signal_msg(struct pt_regs *regs, unsigned long er=
ror_code,

 	printk(KERN_CONT "\n");

+	dump_stack_print_cmdline(loglvl);
+
 	show_opcodes(regs, loglvl);
 }

=2D-
2.37.1