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| author | Paul Moore <paul@paul-moore.com> | 2021-09-29 00:22:26 +0200 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2021-09-30 16:12:33 +0200 |
| commit | f5d0e5e9d72d3a06018efbfa3adccc0e09a129f9 (patch) | |
| tree | 6abffe19f14befd033cdd93e81bdabd93e6a69f2 /security/selinux/include | |
| parent | selinux: enable genfscon labeling for securityfs (diff) | |
| download | linux-f5d0e5e9d72d3a06018efbfa3adccc0e09a129f9.tar.xz linux-f5d0e5e9d72d3a06018efbfa3adccc0e09a129f9.zip | |
selinux: remove the SELinux lockdown implementation
NOTE: This patch intentionally omits any "Fixes:" metadata or stable
tagging since it removes a SELinux access control check; while
removing the control point is the right thing to do moving forward,
removing it in stable kernels could be seen as a regression.
The original SELinux lockdown implementation in 59438b46471a
("security,lockdown,selinux: implement SELinux lockdown") used the
current task's credentials as both the subject and object in the
SELinux lockdown hook, selinux_lockdown(). Unfortunately that
proved to be incorrect in a number of cases as the core kernel was
calling the LSM lockdown hook in places where the credentials from
the "current" task_struct were not the correct credentials to use
in the SELinux access check.
Attempts were made to resolve this by adding a credential pointer
to the LSM lockdown hook as well as suggesting that the single hook
be split into two: one for user tasks, one for kernel tasks; however
neither approach was deemed acceptable by Linus. Faced with the
prospect of either changing the subj/obj in the access check to a
constant context (likely the kernel's label) or removing the SELinux
lockdown check entirely, the SELinux community decided that removing
the lockdown check was preferable.
The supporting changes to the general LSM layer are left intact, this
patch only removes the SELinux implementation.
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/selinux/include')
| -rw-r--r-- | security/selinux/include/classmap.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index 698ccfdaf82d..35aac62a662e 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -250,8 +250,6 @@ struct security_class_mapping secclass_map[] = { { COMMON_SOCK_PERMS, NULL } }, { "perf_event", { "open", "cpu", "kernel", "tracepoint", "read", "write", NULL } }, - { "lockdown", - { "integrity", "confidentiality", NULL } }, { "anon_inode", { COMMON_FILE_PERMS, NULL } }, { "io_uring", |