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ARM: 8764/1: kgdb: fix NUMREGBYTES so that gdb_regs[] is the correct size

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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: <stable@vger.kernel.org> # 2.6.37+
Signed-off-by: David Rivshin <drivshin@allworx.com>
Acked-by: Rabin Vincent <rabin@rab.in>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Rivshin 2018-04-25 21:15:01 +01:00 committed by Greg Kroah-Hartman
parent 4c0e24ab73
commit 523dc24bc5
1 changed files with 1 additions and 1 deletions
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2
arch/arm/include/asm/kgdb.h
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@ -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