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Date: Fri, 17 Aug 2018 01:17:02 +0300
From: Alexander Popov <alex.popov@...ux.com>
To: kernel-hardening@...ts.openwall.com,
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Subject: [PATCH v15 5/7] doc: self-protection: Add information about STACKLEAK feature
Add information about STACKLEAK feature to the "Memory poisoning"
section of self-protection.rst.
Signed-off-by: Alexander Popov <alex.popov@...ux.com>
---
Documentation/security/self-protection.rst | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/Documentation/security/self-protection.rst b/Documentation/security/self-protection.rst
index e1ca698..f584fb7 100644
--- a/Documentation/security/self-protection.rst
+++ b/Documentation/security/self-protection.rst
@@ -302,11 +302,11 @@ sure structure holes are cleared.
Memory poisoning
----------------
-When releasing memory, it is best to poison the contents (clear stack on
-syscall return, wipe heap memory on a free), to avoid reuse attacks that
-rely on the old contents of memory. This frustrates many uninitialized
-variable attacks, stack content exposures, heap content exposures, and
-use-after-free attacks.
+When releasing memory, it is best to poison the contents, to avoid reuse
+attacks that rely on the old contents of memory. E.g., clear stack on a
+syscall return (``CONFIG_GCC_PLUGIN_STACKLEAK``), wipe heap memory on a
+free. This frustrates many uninitialized variable attacks, stack content
+exposures, heap content exposures, and use-after-free attacks.
Destination tracking
--------------------
--
2.7.4
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