Stanislav Kinsburskiy
3fb4afd9a5
prctl: remove one-shot limitation for changing exe link ...
This limitation came with the reason to remove "another way for
malicious code to obscure a compromised program and masquerade as a
benign process" by allowing "security-concious program can use this
prctl once during its early initialization to ensure the prctl cannot
later be abused for this purpose":
http://marc.info/?l=linux-kernel&m=133160684517468&w=2
This explanation doesn't look sufficient. The only thing "exe" link is
indicating is the file, used to execve, which is basically nothing and
not reliable immediately after process has returned from execve system
call.
Moreover, to use this feture, all the mappings to previous exe file have
to be unmapped and all the new exe file permissions must be satisfied.
Which means, that changing exe link is very similar to calling execve on
the binary.
The need to remove this limitations comes from migration of NFS mount
point, which is not accessible during restore and replaced by other file
system. Because of this exe link has to be changed twice.
[akpm@linux-foundation.org: fix up comment]
Link: http://lkml.kernel.org/r/20160927153755.9337.69650.stgit@localhost.localdomain
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-12 18:55:06 -08:00
bpf: xdp: Allow head adjustment in XDP prog
2016-12-08 14:25:13 -05:00
config: android: enable CONFIG_SECCOMP
2016-10-11 15:06:32 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-12-10 16:21:55 -05:00
gcov: add support for gcc version >= 6
2016-07-15 14:54:27 +09:00
genirq: Use irq type from irqdata instead of irqdesc
2016-11-08 15:15:19 +01:00
livepatch/module: make TAINT_LIVEPATCH module-specific
2016-08-26 14:42:08 +02:00
Merge branch 'linus' into locking/core, to pick up fixes
2016-12-11 13:07:13 +01:00
PM / sleep: fix device reference leak in test_suspend
2016-11-02 05:10:04 +01:00
Revert "printk: make reading the kernel log flush pending lines"
2016-11-14 09:31:52 -08:00
rcu: Don't kick unless grace period or request
2016-11-14 10:46:31 -08:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-12 12:15:10 -08:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-12 12:15:10 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-11-22 13:27:16 -05:00
audit: remove useless synchronize_net()
2016-12-01 11:29:02 -05:00
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-07-29 17:54:17 -07:00
audit: cleanup prune_tree_thread
2016-04-04 09:46:47 -04:00
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-09-01 15:55:56 -07:00
audit: add fields to exclude filter by reusing user filter
2016-06-27 11:01:00 -04:00
Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit
2016-10-04 14:21:41 -07:00
kernel: Add noaudit variant of ns_capable()
2016-06-06 20:16:18 +10:00
cgroup: add support for eBPF programs
2016-11-25 16:25:52 -05:00
cgroup: Use lld instead of ld when printing pids controller events_limit
2016-06-21 15:03:36 -04:00
hotplug: Make register and unregister notifier API symmetric
2016-12-08 10:08:41 +01:00
Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2016-10-14 12:18:50 -07:00
cred: Reject inodes with invalid ids in set_create_file_as()
2016-06-30 18:05:09 -05:00
sched/autogroup: Do not use autogroup->tg in zombie threads
2016-11-22 12:33:43 +01:00
kthread: Make struct kthread kmalloc'ed
2016-12-08 14:36:18 +01:00
freezer, oom: check TIF_MEMDIE on the correct task
2016-07-28 16:07:41 -07:00
sched/wake_q: Rename WAKE_Q to DEFINE_WAKE_Q
2016-11-21 10:29:01 +01:00
cred: simpler, 1D supplementary groups
2016-10-07 18:46:30 -07:00
hung_task: allow hung_task_panic when hung_task_warnings is 0
2016-10-11 15:06:33 -07:00
powerpc updates for 4.8 #2
2016-08-05 09:00:54 -04:00
kallsyms: add support for relative offsets in kallsyms address table
2016-03-15 16:55:16 -07:00
locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES
2016-10-25 11:31:51 +02:00
kcov: add missing #include <linux/sched.h>
2016-12-07 17:10:00 -08:00
kexec: allow architectures to override boot mapping
2016-08-02 19:35:27 -04:00
kexec: add restriction on kexec_load() segment sizes
2016-08-02 19:35:31 -04:00
kexec: fix double-free when failing to relocate the purgatory
2016-09-01 17:52:01 -07:00
kprobes: include <asm/sections.h> instead of <asm-generic/sections.h>
2016-10-11 15:06:31 -07:00
kexec: add a kexec_crash_loaded() function
2016-08-02 19:35:30 -04:00
kthread: add __printf attributes
2016-12-12 18:55:06 -08:00
userns: Add per user namespace sysctls.
2016-08-08 13:18:58 -05:00
mm: fix cache mode of dax pmd mappings
2016-09-09 17:34:46 -07:00
Re-enable CONFIG_MODVERSIONS in a slightly weaker form
2016-11-29 16:01:30 -08:00
KEYS: Move the point of trust determination to __key_link()
2016-04-11 22:43:43 +01:00
padata: Convert to hotplug state machine
2016-09-19 21:44:30 +02:00
x86/panic: replace smp_send_stop() with kdump friendly version in panic path
2016-10-11 15:06:32 -07:00
remove lots of IS_ERR_VALUE abuses
2016-05-27 15:26:11 -07:00
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
profile: Convert to hotplug state machine
2016-07-15 10:41:42 +02:00
mm: replace access_process_vm() write parameter with gup_flags
2016-10-19 08:31:25 -07:00
relay: Use irq_work instead of plain timer for deferred wakeup
2016-10-11 15:06:32 -07:00
/proc/iomem: only expose physical resource addresses to privileged users
2016-04-14 12:56:09 -07:00
bpf: drop unnecessary context cast from BPF_PROG_RUN
2016-11-27 20:38:47 -05:00
x86/signal: Add SA_{X32,IA32}_ABI sa_flags
2016-09-14 21:28:11 +02:00
kernel/smp: Tell the user we're bringing up secondary CPUs
2016-10-26 12:02:35 +02:00
kthread/smpboot: do not park in kthread_create_on_cpu()
2016-10-11 15:06:33 -07:00
softirq: Display IRQ_POLL for irq-poll statistics
2016-10-21 15:45:47 -06:00
locking/core, stop_machine: Yield the CPU during stop machine()
2016-11-16 10:15:09 +01:00
prctl: remove one-shot limitation for changing exe link
2016-12-12 18:55:06 -08:00
x86/pkeys: Fix pkeys build breakage for some non-x86 arches
2016-09-13 14:41:36 +02:00
sched/fair: Kill the unused 'sched_shares_window_ns' tunable
2016-10-20 08:44:57 +02:00
kernel/sysctl_binary.c: use generic UUID library
2016-05-20 17:58:30 -07:00
task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works
2016-08-02 19:35:02 -04:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-11-15 10:54:36 -05:00
torture: Convert torture_shutdown() to hrtimer
2016-08-22 10:01:49 -07:00
kernel/...: convert pr_warning to pr_warn
2016-03-22 15:36:02 -07:00
mntns: Add a limit on the number of mount namespaces.
2016-08-31 07:28:35 -05:00
cred: simpler, 1D supplementary groups
2016-10-07 18:46:30 -07:00
smp: Add function to execute a function synchronously on a CPU
2016-09-05 13:52:39 +02:00
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86"
2016-07-10 20:58:36 +02:00
kthread: rename probe_kthread_data() to kthread_probe_data()
2016-10-11 15:06:33 -07:00
3fb4afd9a5