linux-kernel - [PATCH] ELF: warn if process starts with executable stack

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Message-ID: <20191118145114.GA9228@avx2>
Date:   Mon, 18 Nov 2019 17:51:15 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        security@...nel.org
Subject: [PATCH] ELF: warn if process starts with executable stack

PT_GNU_STACK is fail open design, at least warn people that something
isn't right.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 fs/exec.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -762,6 +762,13 @@ int setup_arg_pages(struct linux_binprm *bprm,
 		goto out_unlock;
 	BUG_ON(prev != vma);
 
+#ifdef CONFIG_MMU
+	if (vm_flags & VM_EXEC) {
+		pr_warn_once("process '%s'/%u started with executable stack\n",
+			     current->comm, current->pid);
+	}
+#endif
+
 	/* Move stack pages down in memory. */
 	if (stack_shift) {
 		ret = shift_arg_pages(vma, stack_shift);