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[81.140.166.164]) by smtp.gmail.com with ESMTPSA id d16sm9285303wrg.27.2020.01.09.08.05.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 08:05:06 -0800 (PST) From: Julien Thierry To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: jpoimboe@redhat.com, peterz@infradead.org, raphael.gault@arm.com, catalin.marinas@arm.com, will@kernel.org, Julien Thierry Subject: [RFC v5 17/57] objtool: Make stack validation more generic Date: Thu, 9 Jan 2020 16:02:20 +0000 Message-Id: <20200109160300.26150-18-jthierry@redhat.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200109160300.26150-1-jthierry@redhat.com> References: <20200109160300.26150-1-jthierry@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On x86, when calling a function, the new call frame is alway placed at the start of the stack space this function can freely use. So the frame pointer is always saved at - 16. This is not true for the calling convention of all architecture. When validating the call frame before a call instruction, all that can be done is check that a frame was created by the current function and that the frame pointer is correctly pointing to it. Signed-off-by: Julien Thierry --- tools/objtool/check.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 0a5c51e4e24c..04434cdbdab6 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1176,7 +1176,7 @@ static bool has_modified_stack_frame(struct insn_state *state) static bool has_valid_stack_frame(struct insn_state *state) { if (state->cfa.base == CFI_BP && state->regs[CFI_BP].base == CFI_CFA && - state->regs[CFI_BP].offset == -16) + state->regs[CFI_BP].offset == -state->cfa.offset) return true; if (state->drap && state->regs[CFI_BP].base == CFI_BP) -- 2.21.0