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Date: Mon, 26 Jul 2021 17:39:13 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
Kees Cook <keescook@...omium.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH 4.14 73/82] media: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf()
From: Gustavo A. R. Silva <gustavoars@...nel.org>
commit 8d4abca95ecc82fc8c41912fa0085281f19cc29f upstream.
Fix an 11-year old bug in ngene_command_config_free_buf() while
addressing the following warnings caught with -Warray-bounds:
arch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
The problem is that the original code is trying to copy 6 bytes of
data into a one-byte size member _config_ of the wrong structue
FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a
legitimate compiler warning because memcpy() overruns the length
of &com.cmd.ConfigureBuffers.config. It seems that the right
structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains
6 more members apart from the header _hdr_. Also, the name of
the function ngene_command_config_free_buf() suggests that the actual
intention is to ConfigureFreeBuffers, instead of ConfigureBuffers
(which takes place in the function ngene_command_config_buf(), above).
Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS
into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as
the destination address, instead of &com.cmd.ConfigureBuffers.config,
when calling memcpy().
This also helps with the ongoing efforts to globally enable
-Warray-bounds and get us closer to being able to tighten the
FORTIFY_SOURCE routines on memcpy().
Link: https://github.com/KSPP/linux/issues/109
Fixes: dae52d009fc9 ("V4L/DVB: ngene: Initial check-in")
Cc: stable@...r.kernel.org
Reported-by: kernel test robot <lkp@...el.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Link: https://lore.kernel.org/linux-hardening/20210420001631.GA45456@embeddedor/
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/media/pci/ngene/ngene-core.c | 2 +-
drivers/media/pci/ngene/ngene.h | 14 ++++++++------
2 files changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/media/pci/ngene/ngene-core.c
+++ b/drivers/media/pci/ngene/ngene-core.c
@@ -398,7 +398,7 @@ static int ngene_command_config_free_buf
com.cmd.hdr.Opcode = CMD_CONFIGURE_FREE_BUFFER;
com.cmd.hdr.Length = 6;
- memcpy(&com.cmd.ConfigureBuffers.config, config, 6);
+ memcpy(&com.cmd.ConfigureFreeBuffers.config, config, 6);
com.in_len = 6;
com.out_len = 0;
--- a/drivers/media/pci/ngene/ngene.h
+++ b/drivers/media/pci/ngene/ngene.h
@@ -403,12 +403,14 @@ enum _BUFFER_CONFIGS {
struct FW_CONFIGURE_FREE_BUFFERS {
struct FW_HEADER hdr;
- u8 UVI1_BufferLength;
- u8 UVI2_BufferLength;
- u8 TVO_BufferLength;
- u8 AUD1_BufferLength;
- u8 AUD2_BufferLength;
- u8 TVA_BufferLength;
+ struct {
+ u8 UVI1_BufferLength;
+ u8 UVI2_BufferLength;
+ u8 TVO_BufferLength;
+ u8 AUD1_BufferLength;
+ u8 AUD2_BufferLength;
+ u8 TVA_BufferLength;
+ } __packed config;
} __attribute__ ((__packed__));
struct FW_CONFIGURE_UART {
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