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Message-ID: <20131025131443.GA7759@www.outflux.net> Date: Fri, 25 Oct 2013 06:14:43 -0700 From: Kees Cook <keescook@...omium.org> To: Michal Marek <mmarek@...e.cz> Cc: linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org Subject: [PATCH] kbuild: replace unbounded sprintf call in modpost The modpost tool could overflow its stack buffer if someone was running with an insane shell environment. Regardless, it's technically a bug, so this fixes it to truncate the string instead of seg-faulting. Found by Coverity. Signed-off-by: Kees Cook <keescook@...omium.org> --- scripts/mod/sumversion.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c index 9dfcd6d988da..deb2994b04c4 100644 --- a/scripts/mod/sumversion.c +++ b/scripts/mod/sumversion.c @@ -416,7 +416,7 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen) basename = strrchr(modname, '/') + 1; else basename = modname; - sprintf(filelist, "%s/%.*s.mod", modverdir, + snprintf(filelist, sizeof(filelist), "%s/%.*s.mod", modverdir, (int) strlen(basename) - 2, basename); file = grab_file(filelist, &len); -- 1.7.9.5 -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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