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Date: Sun, 6 Feb 2022 09:45:08 -0800 From: Kees Cook <keescook@...omium.org> To: Alexander Popov <alex.popov@...ux.com> Cc: Kees Cook <keescook@...omium.org>, Peter Zijlstra <peterz@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Josh Poimboeuf <jpoimboe@...hat.com>, Borislav Petkov <bp@...en8.de>, Masahiro Yamada <masahiroy@...nel.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH 3/3] gcc-plugins/stackleak: Ignore .noinstr.text and .entry.text The .noinstr.text section functions may not have "current()" sanely available. Similarly true for .entry.text, though such a check is currently redundant. Add a check for both. In an x86_64 defconfig build, the following functions no longer receive stackleak instrumentation: __do_fast_syscall_32() do_int80_syscall_32() do_machine_check() do_syscall_64() exc_general_protection() fixup_bad_iret() Suggested-by: Peter Zijlstra <peterz@...radead.org> Cc: Alexander Popov <alex.popov@...ux.com> Signed-off-by: Kees Cook <keescook@...omium.org> --- scripts/gcc-plugins/stackleak_plugin.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/scripts/gcc-plugins/stackleak_plugin.c b/scripts/gcc-plugins/stackleak_plugin.c index 623bcad6d0c7..c8dc7fe4f959 100644 --- a/scripts/gcc-plugins/stackleak_plugin.c +++ b/scripts/gcc-plugins/stackleak_plugin.c @@ -463,6 +463,10 @@ static bool stackleak_gate(void) return false; if (STRING_EQUAL(section, ".meminit.text")) return false; + if (STRING_EQUAL(section, ".noinstr.text")) + return false; + if (STRING_EQUAL(section, ".entry.text")) + return false; } return track_frame_size >= 0; -- 2.30.2
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