linux-kernel - Re: [PATCHv2] lz4: fix system halted at boot kernel x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

message-id: <551ED5F5.7050700@winsoft.pl>
Date:	Fri, 3 Apr 2015 20:03:33 +0200
From:	Krzysztof Kolasa <kkolasa@...soft.pl>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Alexander Kuleshov <alex0xax@...il.com>, dsterba@...e.cz,
	tom.yeon@...driver.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] lz4: fix system halted at boot kernel x86_64 compressed lz4

Decompression process ends with an error when loading 64bit lz4 kernel:

Decoding failed
 -- System halted

This condition is not needed for 64bit kernel( from the last commit d5e7caf )

if( ... ||
    (op + COPYLENGTH) > oend)
    goto _output_error

macro LZ4_SECURE_COPY() tests op and does not copy any data
when op exceeds the value, decompression process is continued.

added by analogy to lz4_uncompress_unknownoutputsize(...)

Signed-off-by: Krzysztof Kolasa <kkolasa@...soft.pl>
---
 lib/lz4/lz4_decompress.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c
index f0f5c5c..8a742b1 100644
--- a/lib/lz4/lz4_decompress.c
+++ b/lib/lz4/lz4_decompress.c
@@ -139,8 +139,12 @@ static int lz4_uncompress(const char *source, char *dest, int osize)
             /* Error: request to write beyond destination buffer */
             if (cpy > oend)
                 goto _output_error;
+#if LZ4_ARCH64
+            if ((ref + COPYLENGTH) > oend)
+#else
             if ((ref + COPYLENGTH) > oend ||
                     (op + COPYLENGTH) > oend)
+#endif
                 goto _output_error;
             LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));
             while (op < cpy)
@@ -270,7 +274,13 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
         if (cpy > oend - COPYLENGTH) {
             if (cpy > oend)
                 goto _output_error; /* write outside of buf */
-
+#if LZ4_ARCH64
+            if ((ref + COPYLENGTH) > oend)
+#else
+            if ((ref + COPYLENGTH) > oend ||
+                    (op + COPYLENGTH) > oend)
+#endif
+                goto _output_error;
             LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));
             while (op < cpy)
                 *op++ = *ref++;
-- 
2.4.0.rc0.dirty

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/