linux-hardening - [RFC PATCH v1 4/8] mseal: seal mprotect

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Message-ID: <20231016143828.647848-5-jeffxu@chromium.org>
Date: Mon, 16 Oct 2023 14:38:23 +0000
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Subject: [RFC PATCH v1 4/8] mseal: seal mprotect

From: Jeff Xu <jeffxu@...gle.com>

check sealing for mprotect(2).

Signed-off-by: Jeff Xu <jeffxu@...gle.com>
---
 mm/mprotect.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 130db91d3a8c..5b67c66d55f7 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -753,6 +753,12 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
 		}
 	}
 
+	if (!can_modify_mm(current->mm, start, end, MM_ACTION_MPROTECT,
+			   ON_BEHALF_OF_USERSPACE)) {
+		error = -EACCES;
+		goto out;
+	}
+
 	prev = vma_prev(&vmi);
 	if (start > vma->vm_start)
 		prev = vma;
-- 
2.42.0.609.gbb76f46606-goog