* [PATCH v3 0/1] Add documentation for sysctl vm.memfd_noexec
@ 2023-06-30 3:25 jeffxu
2023-06-30 3:25 ` [PATCH v3 1/1] Documentation: mm/memfd: vm.memfd_noexec jeffxu
0 siblings, 1 reply; 2+ messages in thread
From: jeffxu @ 2023-06-30 3:25 UTC (permalink / raw)
To: skhan, keescook
Cc: akpm, dmitry.torokhov, dverkamp, asmadeus, hughd, jeffxu,
jorgelo, linux-kernel, linux-kselftest, linux-mm, jannh,
linux-hardening, linux-security-module
From: Jeff Xu <jeffxu@google.com>
Add documentation for sysctl vm.memfd_noexec
Thanks to Dominique Martinet <asmadeus@codewreck.org> who reported this.
see [1] for context.
[1] https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/
V3: resend V2 with cover letter.
V2: revise.
V1: initial version.
Jeff Xu (1):
Documentation: mm/memfd: vm.memfd_noexec
Documentation/admin-guide/sysctl/vm.rst | 30 +++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--
2.41.0.255.g8b1d071c50-goog
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH v3 1/1] Documentation: mm/memfd: vm.memfd_noexec
2023-06-30 3:25 [PATCH v3 0/1] Add documentation for sysctl vm.memfd_noexec jeffxu
@ 2023-06-30 3:25 ` jeffxu
0 siblings, 0 replies; 2+ messages in thread
From: jeffxu @ 2023-06-30 3:25 UTC (permalink / raw)
To: skhan, keescook
Cc: akpm, dmitry.torokhov, dverkamp, asmadeus, hughd, jeffxu,
jorgelo, linux-kernel, linux-kselftest, linux-mm, jannh,
linux-hardening, linux-security-module
From: Jeff Xu <jeffxu@google.com>
Add documentation for sysctl vm.memfd_noexec
Link:https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/
Reported-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Jeff Xu <jeffxu@google.com>
---
Documentation/admin-guide/sysctl/vm.rst | 30 +++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst
index 45ba1f4dc004..621588041a9e 100644
--- a/Documentation/admin-guide/sysctl/vm.rst
+++ b/Documentation/admin-guide/sysctl/vm.rst
@@ -424,6 +424,36 @@ e.g., up to one or two maps per allocation.
The default value is 65530.
+memfd_noexec:
+=============
+This pid namespaced sysctl controls memfd_create().
+
+The new MFD_NOEXEC_SEAL and MFD_EXEC flags of memfd_create() allows
+application to set executable bit at creation time.
+
+When MFD_NOEXEC_SEAL is set, memfd is created without executable bit
+(mode:0666), and sealed with F_SEAL_EXEC, so it can't be chmod to
+be executable (mode: 0777) after creation.
+
+when MFD_EXEC flag is set, memfd is created with executable bit
+(mode:0777), this is the same as the old behavior of memfd_create.
+
+The new pid namespaced sysctl vm.memfd_noexec has 3 values:
+0: memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL acts like
+ MFD_EXEC was set.
+1: memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL acts like
+ MFD_NOEXEC_SEAL was set.
+2: memfd_create() without MFD_NOEXEC_SEAL will be rejected.
+
+The default value is 0.
+
+Once set, it can't be downgraded at runtime, i.e. 2=>1, 1=>0
+are denied.
+
+This is pid namespaced sysctl, child processes inherit the parent
+process's memfd_noexec at the time of fork. Changes to the parent
+process after fork are not automatically propagated to the child
+process.
memory_failure_early_kill:
==========================
--
2.41.0.255.g8b1d071c50-goog
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