Commit-ID: 3b27d13940c3710a1128527c43719cb0bb05d73b
Gitweb: http://git.kernel.org/tip/3b27d13940c3710a1128527c43719cb0bb05d73b
Author: Wang Nan <wangnan0@xxxxxxxxxx>
AuthorDate: Tue, 1 Sep 2015 03:29:44 +0000
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 1 Sep 2015 11:33:48 -0300
perf dwarf: Fix potential array out of bounds access
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@xxxxxxxxxx>
Reviewed-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1441078184-105038-1-git-send-email-wangnan0@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/arch/sh/util/dwarf-regs.c | 2 +-
tools/perf/arch/sparc/util/dwarf-regs.c | 2 +-
tools/perf/arch/x86/util/dwarf-regs.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/arch/sh/util/dwarf-regs.c b/tools/perf/arch/sh/util/dwarf-regs.c
index 0d0897f..f8dfa89 100644
--- a/tools/perf/arch/sh/util/dwarf-regs.c
+++ b/tools/perf/arch/sh/util/dwarf-regs.c
@@ -51,5 +51,5 @@ const char *sh_regs_table[SH_MAX_REGS] = {
/* Return architecture dependent register string (for kprobe-tracer) */
const char *get_arch_regstr(unsigned int n)
{
- return (n <= SH_MAX_REGS) ? sh_regs_table[n] : NULL;
+ return (n < SH_MAX_REGS) ? sh_regs_table[n] : NULL;
}
diff --git a/tools/perf/arch/sparc/util/dwarf-regs.c b/tools/perf/arch/sparc/util/dwarf-regs.c
index 92eda41..b704fdb 100644
--- a/tools/perf/arch/sparc/util/dwarf-regs.c
+++ b/tools/perf/arch/sparc/util/dwarf-regs.c
@@ -39,5 +39,5 @@ const char *sparc_regs_table[SPARC_MAX_REGS] = {
*/
const char *get_arch_regstr(unsigned int n)
{
- return (n <= SPARC_MAX_REGS) ? sparc_regs_table[n] : NULL;
+ return (n < SPARC_MAX_REGS) ? sparc_regs_table[n] : NULL;
}
diff --git a/tools/perf/arch/x86/util/dwarf-regs.c b/tools/perf/arch/x86/util/dwarf-regs.c
index be22dd4..a08de0a 100644
--- a/tools/perf/arch/x86/util/dwarf-regs.c
+++ b/tools/perf/arch/x86/util/dwarf-regs.c
@@ -71,5 +71,5 @@ const char *x86_64_regs_table[X86_64_MAX_REGS] = {
/* Return architecture dependent register string (for kprobe-tracer) */
const char *get_arch_regstr(unsigned int n)
{
- return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
+ return (n < ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
}
--
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