3b27d13940
There is a problem in the dwarf-regs.c files for sh, sparc and x86 where it is possible to make an out-of-bounds array access when searching for register names. This patch fixes it by replacing '<=' to '<', so when register (number == XXX_MAX_REGS), get_arch_regstr() will return NULL. Signed-off-by: Wang Nan <wangnan0@huawei.com> Reviewed-by: Matt Fleming <matt@console-pimps.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: David S. Miller <davem@davemloft.net> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@huawei.com Link: http://lkml.kernel.org/r/1441078184-105038-1-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/*
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* dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
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* Extracted from probe-finder.c
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <stddef.h>
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#include <dwarf-regs.h>
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/*
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* Generic dwarf analysis helpers
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*/
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#define X86_32_MAX_REGS 8
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const char *x86_32_regs_table[X86_32_MAX_REGS] = {
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"%ax",
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"%cx",
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"%dx",
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"%bx",
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"$stack", /* Stack address instead of %sp */
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"%bp",
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"%si",
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"%di",
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};
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#define X86_64_MAX_REGS 16
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const char *x86_64_regs_table[X86_64_MAX_REGS] = {
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"%ax",
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"%dx",
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"%cx",
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"%bx",
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"%si",
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"%di",
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"%bp",
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"%sp",
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"%r8",
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"%r9",
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"%r10",
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"%r11",
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"%r12",
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"%r13",
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"%r14",
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"%r15",
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};
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/* TODO: switching by dwarf address size */
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#ifdef __x86_64__
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#define ARCH_MAX_REGS X86_64_MAX_REGS
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#define arch_regs_table x86_64_regs_table
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#else
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#define ARCH_MAX_REGS X86_32_MAX_REGS
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#define arch_regs_table x86_32_regs_table
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#endif
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/* Return architecture dependent register string (for kprobe-tracer) */
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const char *get_arch_regstr(unsigned int n)
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{
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return (n < ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
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}
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