diff mbox series

[RFC,1/3] lsm: Clarify documentation of vm_enough_memory hook

Message ID 20221028164948.385783-1-roberto.sassu@huaweicloud.com (mailing list archive)
State Superseded
Headers show
Series [RFC,1/3] lsm: Clarify documentation of vm_enough_memory hook | expand

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Context Check Description
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netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter warning Series does not have a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 181 this patch: 181
netdev/cc_maintainers success CCed 3 of 3 maintainers
netdev/build_clang success Errors and warnings before: 129 this patch: 129
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 181 this patch: 181
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Roberto Sassu Oct. 28, 2022, 4:49 p.m. UTC 
From: Roberto Sassu <roberto.sassu@huawei.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@huawei.com>
---
 include/linux/lsm_hooks.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

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