From: Sergei Trofimovich <slyich(a)gmail.com&gt; objtool: check: give big enough buffer for pv_ops 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(a)redhat.com&gt; CC: Peter Zijlstra <peterz(a)infradead.org&gt; diff --git a/tools/objtool/check.c b/tools/objtool/check.c index blahblah..blahblah 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2854,7 +2854,7 @@ 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; -- https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1586