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From nobody Wed Jan 19 11:56:00 2022
From: Sergei Trofimovich <slyich@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Sergei Trofimovich <slyich@gmail.com>, Josh Poimboeuf <jpoimboe@redhat.com>
Subject: [PATCH] objtool: check: give big enough buffer for pv_ops
Date: Fri, 14 Jan 2022 07:57:56 +0000
Message-Id: <20220114075756.838243-1-slyich@gmail.com>
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
MIME-Version: 1.0
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On gcc-12 build fails flagging possible buffer overflow:
check.c: In function 'validate_call':
check.c:2865:58: error: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 9 [-Werror=format-truncation=]
2865 | snprintf(pvname, sizeof(pvname), "pv_ops[%d]", idx);
| ^~
I think it's a valid warning:
static char pvname[16];
int idx;
...
idx = (rel->addend / sizeof(void *));
snprintf(pvname, sizeof(pvname), "pv_ops[%d]", idx);
we have only 7 chars for %d while it could take up to 9.
CC: Josh Poimboeuf <jpoimboe@redhat.com>
CC: Peter Zijlstra <peterz@infradead.org>
---
tools/objtool/check.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 8c1931eab5f1..0fae132ea59f 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2852,7 +2852,7 @@ static inline bool func_uaccess_safe(struct symbol *func)
static inline const char *call_dest_name(struct instruction *insn)
{
- static char pvname[16];
+ static char pvname[32];
struct reloc *rel;
int idx;
--
2.34.1
|
