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gcc-plugins/stackleak: Ignore .noinstr.text and .entry.text

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commit ae978009fc013e3166c9f523f8b17e41a3c0286e upstream.

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@infradead.org>
Cc: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2022-02-06 09:12:50 -08:00 committed by Greg Kroah-Hartman
parent 2d154a54c5
commit 7e0bd07ce9
1 changed files with 4 additions and 0 deletions
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4
scripts/gcc-plugins/stackleak_plugin.c
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@ -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;