On Mon, Sep 12, 2022 at 04:40:22PM +0200, Greg Kroah-Hartman wrote: > On Mon, Sep 12, 2022 at 04:15:22PM +0800, Jisheng Zhang wrote: > > From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> > > > > commit 9d5f0c36438eeae7566ca383b2b673179e3cc613 upstream. > > > > Its more intention revealing, and if we're interested in the odd cases > > where this may end up truncating we can do debug checks at one > > centralized place. > > > > Motivation, of all the container builds, fedora rawhide started > > complaining of: > > > > util/machine.c: In function ‘machine__create_modules’: > > util/machine.c:1419:50: error: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size between 0 and 4095 [-Werror=format-truncation=] > > 1419 | snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); > > | ^~ > > In file included from /usr/include/stdio.h:894, > > from util/branch.h:9, > > from util/callchain.h:8, > > from util/machine.c:7: > > In function ‘snprintf’, > > inlined from ‘maps__set_modules_path_dir’ at util/machine.c:1419:3, > > inlined from ‘machine__set_modules_path’ at util/machine.c:1473:9, > > inlined from ‘machine__create_modules’ at util/machine.c:1519:7: > > /usr/include/bits/stdio2.h:71:10: note: ‘__builtin___snprintf_chk’ output between 2 and 4352 bytes into a destination of size 4096 > > > > There are other places where we should use path__join(), but lets get rid of > > this one first. > > > > Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx> > > Cc: Ian Rogers <irogers@xxxxxxxxxx> > > Cc: Jiri Olsa <jolsa@xxxxxxxxxx> > > Cc: Namhyung Kim <namhyung@xxxxxxxxxx> > > Acked-by: Ian Rogers <irogers@xxxxxxxxxx> > > Link: Link: https://lore.kernel.org/r/YebZKjwgfdOz0lAs@xxxxxxxxxx > > Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> > > As you are forwarding on this commit, you too need to sign-off on it. Thanks for the information. > > > --- > > > > Since v1: > > - add commit id in upstream. > > - add linux-5.15.y, maybe we also need this for other long term stable > > tree. > > Why is this needed in 5.15? Building linux-5.15.y perf with gcc-12 will emit the same error as the commit msg says. Thanks
