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Date: Tue, 15 Nov 2022 18:56:49 +0100 From: Roberto Sassu <roberto.sassu@...weicloud.com> To: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org, revest@...omium.org, jackmanb@...omium.org, paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com Cc: bpf@...r.kernel.org, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com> Subject: [RFC][PATCH 1/4] lsm: Clarify documentation of vm_enough_memory hook From: Roberto Sassu <roberto.sassu@...wei.com> include/linux/lsm_hooks.h reports the result of the LSM infrastructure to the callers, not what LSMs should return to the LSM infrastructure. Clarify that and add that returning 1 from the LSMs means calling __vm_enough_memory() with cap_sys_admin set, 0 without. Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com> Reviewed-by: KP Singh <kpsingh@...nel.org> --- include/linux/lsm_hooks.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 4ec80b96c22e..f40b82ca91e7 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1411,7 +1411,9 @@ * Check permissions for allocating a new virtual mapping. * @mm contains the mm struct it is being added to. * @pages contains the number of pages. - * Return 0 if permission is granted. + * Return 0 if permission is granted by LSMs to the caller. LSMs should + * return 1 if __vm_enough_memory() should be called with + * cap_sys_admin set, 0 if not. * * @ismaclabel: * Check if the extended attribute specified by @name -- 2.25.1
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