linux-kernel - [PATCH 3.16 16/83] libata: zpodd: Fix small read overflow in zpodd_get_mech

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Message-ID: <lsq.1574264230.506788637@decadent.org.uk>
Date:   Wed, 20 Nov 2019 15:37:26 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Kees Cook" <keescook@...omium.org>,
        "Jeffrin Jose T" <jeffrin@...agiritech.edu.in>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        "Jens Axboe" <axboe@...nel.dk>
Subject: [PATCH 3.16 16/83] libata: zpodd: Fix small read overflow in
 zpodd_get_mech_type()

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit 71d6c505b4d9e6f76586350450e785e3d452b346 upstream.

Jeffrin reported a KASAN issue:

  BUG: KASAN: global-out-of-bounds in ata_exec_internal_sg+0x50f/0xc70
  Read of size 16 at addr ffffffff91f41f80 by task scsi_eh_1/149
  ...
  The buggy address belongs to the variable:
    cdb.48319+0x0/0x40

Much like commit 18c9a99bce2a ("libata: zpodd: small read overflow in
eject_tray()"), this fixes a cdb[] buffer length, this time in
zpodd_get_mech_type():

We read from the cdb[] buffer in ata_exec_internal_sg(). It has to be
ATAPI_CDB_LEN (16) bytes long, but this buffer is only 12 bytes.

Reported-by: Jeffrin Jose T <jeffrin@...agiritech.edu.in>
Fixes: afe759511808c ("libata: identify and init ZPODD devices")
Link: https://lore.kernel.org/lkml/201907181423.E808958@keescook/
Tested-by: Jeffrin Jose T <jeffrin@...agiritech.edu.in>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/ata/libata-zpodd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -55,7 +55,7 @@ static enum odd_mech_type zpodd_get_mech
 	unsigned int ret;
 	struct rm_feature_desc *desc = (void *)(buf + 8);
 	struct ata_taskfile tf;
-	static const char cdb[] = {  GPCMD_GET_CONFIGURATION,
+	static const char cdb[ATAPI_CDB_LEN] = {  GPCMD_GET_CONFIGURATION,
 			2,      /* only 1 feature descriptor requested */
 			0, 3,   /* 3, removable medium feature */
 			0, 0, 0,/* reserved */