On Mon, 18 Jun 2018, Waiman Long wrote:
v7->v8:
- Remove the __read_mostly tag for ipc_mni and related variables as their
accesses are not really in performance critical path.
- Add a new ipcmni_compat sysctl parameter that can be set to restore old
range check behavior if desired.
v6->v7:
- Drop the range clamping code and just return error instead for now
until there is user request for clamping support.
- Fix compilation error when CONFIG_SYSVIPC_SYSCTL isn't defined.
v5->v6:
- Consolidate the 3 ctl_table flags into 2.
- Make similar changes to proc_doulongvec_minmax() and its associates
to complete the clamping change.
- Remove the sysctl registration failure test patch for now for later
consideration.
- Add extra braces to patch 1 to reduce code diff in a later patch.
v4->v5:
- Revert the flags back to 16-bit so that there will be no change to
the size of ctl_table.
- Enhance the sysctl_check_flags() as requested by Luis to perform more
checks to spot incorrect ctl_table entries.
- Change the sysctl selftest to use dummy sysctls instead of production
ones & enhance it to do more checks.
- Add one more sysctl selftest for registration failure.
- Add 2 ipc patches to add an extended mode to increase IPCMNI from
32k to 2M.
- Miscellaneous change to incorporate feedback comments from
reviewers.
v3->v4:
- Remove v3 patches 1 & 2 as they have been merged into the mm tree.
- Change flags from uint16_t to unsigned int.
- Remove CTL_FLAGS_OOR_WARNED and use pr_warn_ratelimited() instead.
- Simplify the warning message code.
- Add a new patch to fail the ctl_table registration with invalid flag.
- Add a test case for range clamping in sysctl selftest.
v2->v3:
- Fix kdoc comment errors.
- Incorporate comments and suggestions from Luis R. Rodriguez.
- Add a patch to fix a typo error in fs/proc/proc_sysctl.c.
v1->v2:
- Add kdoc comments to the do_proc_do{u}intvec_minmax_conv_param
structures.
- Add a new flags field to the ctl_table structure for specifying
whether range clamping should be activated instead of adding new
sysctl parameter handlers.
- Clamp the semmni value embedded in the multi-values sem parameter.
v5 patch: https://lkml.org/lkml/2018/3/16/1106
v6 patch: https://lkml.org/lkml/2018/4/27/1094
v7 patch: https://lkml.org/lkml/2018/5/7/666
The sysctl parameters msgmni, shmmni and semmni have an inherent limit
of IPC_MNI (32k). However, users may not be aware of that because they
can write a value much higher than that without getting any error or
notification. Reading the parameters back will show the newly written
values which are not real.
The real IPCMNI limit is now enforced to make sure that users won't
put in an unrealistic value. The first 2 patches enforce the limits.
There are also users out there requesting increase in the IPCMNI value.
The last 2 patches attempt to do that by using a boot kernel parameter
"ipcmni_extend" to increase the IPCMNI limit from 32k to 2M if the users
really want the extended value.
Enforcing the range limit check may cause some existing applications to break
if they unwittingly set a value higher than 32k. To allow system administrators
to work around this issue, a new ipcmni_compat sysctl parameter can now be set
to restore the old behavior. This compatibility mode can only be set if the
ipcmni_extend boot parameter is not specified. Patch 5 implements this new
sysctl parameter.
Waiman Long (5):
ipc: IPCMNI limit check for msgmni and shmmni
ipc: IPCMNI limit check for semmni
I've reviewed the first two which look good and are actual immediate fixes
to the bogus user input. I haven't gotten around yet the rest of the patches
but are at least a bit more controversial than the first two. As such, could
patch 1 and 2 be picked up once the merge window closes, for v4.20? Although
-stable might want in, this situation is quite historic, so it's not that
urgent.
Thanks,
Davidlohr
ipc: Allow boot time extension of IPCMNI from 32k to 2M
ipc: Conserve sequence numbers in extended IPCMNI mode
ipc: Add a new ipcmni_compat sysctl to fall back to old behavior
Documentation/admin-guide/kernel-parameters.txt | 3 +
Documentation/sysctl/kernel.txt | 15 +++++
include/linux/ipc_namespace.h | 1 +
ipc/ipc_sysctl.c | 78 ++++++++++++++++++++++++-
ipc/util.c | 41 ++++++++-----
ipc/util.h | 50 +++++++++++++---
6 files changed, 164 insertions(+), 24 deletions(-)
--
1.8.3.1
