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From: Lucas De Marchi <lucas.de.marchi@gmail.com>
To: linux-modules@vger.kernel.org
Cc: Jorge Lucangeli Obes <jorgelo@google.com>,
	Lucas De Marchi <lucas.demarchi@intel.com>
Subject: [PATCH] libkmod: reset was_space on second pass
Date: Mon, 20 Jan 2020 16:22:10 -0300
Message-ID: <20200120192210.6370-1-lucas.de.marchi@gmail.com> (raw)

From: Lucas De Marchi <lucas.demarchi@intel.com>

The softdep config parser uses a 2-pass approach to use a single
allocation for all the softdep struct. However "was_space" variable
isn't reset between them. This can lead to a buffer overflow.

Reported-by: Jorge Lucangeli Obes <jorgelo@google.com>
Link: https://lore.kernel.org/linux-modules/CAKYuF5QhGCPCazHQjN-=kFc5kHs7Ok8WqmmGLo31CiOEN8TYdA@mail.gmail.com
---
 libkmod/libkmod-config.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libkmod/libkmod-config.c b/libkmod/libkmod-config.c
index aaac0a1..7b62367 100644
--- a/libkmod/libkmod-config.c
+++ b/libkmod/libkmod-config.c
@@ -335,6 +335,7 @@ static int kmod_config_add_softdep(struct kmod_config *config,
 	n_pre = 0;
 	n_post = 0;
 	mode = S_NONE;
+	was_space = false;
 	for (p = s = line; ; s++) {
 		size_t plen;
 
-- 
2.24.1


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-20 19:22 Lucas De Marchi [this message]
2020-01-27 13:46 ` Lucas De Marchi
2020-01-28 15:03   ` Jorge Lucangeli Obes

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