linux/security/tomoyo
Lorenzo Stoakes ca5e863233 mm/gup: remove vmas parameter from get_user_pages_remote()
The only instances of get_user_pages_remote() invocations which used the
vmas parameter were for a single page which can instead simply look up the
VMA directly. In particular:-

- __update_ref_ctr() looked up the VMA but did nothing with it so we simply
  remove it.

- __access_remote_vm() was already using vma_lookup() when the original
  lookup failed so by doing the lookup directly this also de-duplicates the
  code.

We are able to perform these VMA operations as we already hold the
mmap_lock in order to be able to call get_user_pages_remote().

As part of this work we add get_user_page_vma_remote() which abstracts the
VMA lookup, error handling and decrementing the page reference count should
the VMA lookup fail.

This forms part of a broader set of patches intended to eliminate the vmas
parameter altogether.

[akpm@linux-foundation.org: avoid passing NULL to PTR_ERR]
Link: https://lkml.kernel.org/r/d20128c849ecdbf4dd01cc828fcec32127ed939a.1684350871.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> (for arm64)
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com> (for s390)
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-06-09 16:25:26 -07:00
..
policy
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
audit.c tomoyo: replace tomoyo_round2() with kmalloc_size_roundup() 2023-03-01 23:46:12 +09:00
common.c tomoyo: replace tomoyo_round2() with kmalloc_size_roundup() 2023-03-01 23:46:12 +09:00
common.h tomoyo: replace tomoyo_round2() with kmalloc_size_roundup() 2023-03-01 23:46:12 +09:00
condition.c tomoyo: Fix typo in comments. 2020-12-06 13:44:57 +09:00
domain.c mm/gup: remove vmas parameter from get_user_pages_remote() 2023-06-09 16:25:26 -07:00
environ.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
file.c tomoyo: struct path it might get from LSM callers won't have NULL dentry or mnt 2022-08-21 11:50:42 -04:00
gc.c tomoyo: Fix typo in comments. 2020-12-06 13:44:57 +09:00
group.c tomoyo: Suppress RCU warning at list_for_each_entry_rcu(). 2019-12-16 23:02:27 +09:00
Kconfig tomoyo: Update website link 2023-01-13 23:11:38 +09:00
load_policy.c TOMOYO: fix __setup handlers return values 2022-02-24 07:45:07 +09:00
Makefile tomoyo: Omit use of bin2c 2023-01-09 21:46:50 +09:00
memory.c tomoyo: Fix null pointer check 2020-11-27 19:36:11 +09:00
mount.c tomoyo: Coding style fix. 2019-01-24 14:50:27 -08:00
network.c tomoyo: don't special case PF_IO_WORKER for PF_KTHREAD 2021-03-28 13:11:29 +09:00
realpath.c tomoyo: struct path it might get from LSM callers won't have NULL dentry or mnt 2022-08-21 11:50:42 -04:00
securityfs_if.c tomoyo: fix doc warnings 2021-06-16 00:01:28 +09:00
tomoyo.c selinux: remove the runtime disable functionality 2023-03-20 12:34:23 -04:00
util.c tomoyo: use hwight16() in tomoyo_domain_quota_is_ok() 2021-12-15 20:13:55 +09:00