From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, David Rivshin , Rabin Vincent , Daniel Thompson , Russell King Subject: [PATCH 4.9 030/101] ARM: 8764/1: kgdb: fix NUMREGBYTES so that gdb_regs[] is the correct size Date: Sun, 1 Jul 2018 18:21:16 +0200 Message-Id: <20180701160758.361937930@linuxfoundation.org> In-Reply-To: <20180701160757.138608453@linuxfoundation.org> References: <20180701160757.138608453@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Rivshin commit 76ed0b803a2ab793a1b27d1dfe0de7955282cd34 upstream. NUMREGBYTES (which is used as the size for gdb_regs[]) is incorrectly based on DBG_MAX_REG_NUM instead of GDB_MAX_REGS. DBG_MAX_REG_NUM is the number of total registers, while GDB_MAX_REGS is the number of 'unsigned longs' it takes to serialize those registers. Since FP registers require 3 'unsigned longs' each, DBG_MAX_REG_NUM is smaller than GDB_MAX_REGS. This causes GDB 8.0 give the following error on connect: "Truncated register 19 in remote 'g' packet" This also causes the register serialization/deserialization logic to overflow gdb_regs[], overwriting whatever follows. Fixes: 834b2964b7ab ("kgdb,arm: fix register dump") Cc: # 2.6.37+ Signed-off-by: David Rivshin Acked-by: Rabin Vincent Tested-by: Daniel Thompson Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- arch/arm/include/asm/kgdb.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/include/asm/kgdb.h +++ b/arch/arm/include/asm/kgdb.h @@ -76,7 +76,7 @@ extern int kgdb_fault_expected; #define KGDB_MAX_NO_CPUS 1 #define BUFMAX 400 -#define NUMREGBYTES (DBG_MAX_REG_NUM << 2) +#define NUMREGBYTES (GDB_MAX_REGS << 2) #define NUMCRITREGBYTES (32 << 2) #define _R0 0