History log of /linux/kernel/livepatch/patch.c (Results 126 – 150 of 204)
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Revision tags: v5.1-rc3
# 0e2f54f8 27-Mar-2019 Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Merge drm/drm-next into drm-intel-next-queued

This is needed to get the fourcc code merged without conflicts.

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>


# 9d7b7bfb 27-Mar-2019 James Morris <james.morris@microsoft.com>

Merge tag 'v5.1-rc2' into next-general

Merge to Linux 5.1-rc2 for subsystems to work with.


Revision tags: v5.1-rc2
# 86008304 19-Mar-2019 Stefan Schmidt <stefan@datenfreihafen.org>

Merge remote-tracking branch 'net/master'


# 249acb5f 19-Mar-2019 Mark Brown <broonie@kernel.org>

Merge tag 'v5.1-rc1' into spi-5.2

Linux 5.1-rc1


# c9e48084 19-Mar-2019 Mark Brown <broonie@kernel.org>

Merge tag 'v5.1-rc1' into regulator-5.2

Linux 5.1-rc1


# 12747059 18-Mar-2019 Mark Brown <broonie@kernel.org>

Merge tag 'v5.1-rc1' into asoc-5.2

Linux 5.1-rc1


# 22d91ed3 18-Mar-2019 Mark Brown <broonie@kernel.org>

Merge tag 'v5.1-rc1' into asoc-5.1

Linux 5.1-rc1


Revision tags: v5.1-rc1
# b7af27bf 08-Mar-2019 Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching updates from Jiri Kosina:

- support for something we call 'atomic replace', an

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching updates from Jiri Kosina:

- support for something we call 'atomic replace', and allows for much
better handling of cumulative patches (which is something very useful
for distros), from Jason Baron with help of Petr Mladek and Joe
Lawrence

- improvement of handling of tasks blocking finalization, from Miroslav
Benes

- update of MAINTAINERS file to reflect move towards group
maintainership

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: (22 commits)
livepatch/selftests: use "$@" to preserve argument list
livepatch: Module coming and going callbacks can proceed with all listed patches
livepatch: Proper error handling in the shadow variables selftest
livepatch: return -ENOMEM on ptr_id() allocation failure
livepatch: Introduce klp_for_each_patch macro
livepatch: core: Return EOPNOTSUPP instead of ENOSYS
selftests/livepatch: add DYNAMIC_DEBUG config dependency
livepatch: samples: non static warnings fix
livepatch: update MAINTAINERS
livepatch: Remove signal sysfs attribute
livepatch: Send a fake signal periodically
selftests/livepatch: introduce tests
livepatch: Remove ordering (stacking) of the livepatches
livepatch: Atomic replace and cumulative patches documentation
livepatch: Remove Nop structures when unused
livepatch: Add atomic replace
livepatch: Use lists to manage patches, objects and functions
livepatch: Simplify API by removing registration step
livepatch: Don't block the removal of patches loaded after a forced transition
livepatch: Consolidate klp_free functions
...

show more ...


Revision tags: v5.0, v5.0-rc8, v5.0-rc7, v5.0-rc6
# 82ffd045 07-Feb-2019 Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Merge tag 'v5.0-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into fbdev-for-next

Linux 5.0-rc5

Sync with upstream (which now contains fbdev-v5.0-rc3 changes) to
prepare a

Merge tag 'v5.0-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into fbdev-for-next

Linux 5.0-rc5

Sync with upstream (which now contains fbdev-v5.0-rc3 changes) to
prepare a base for fbdev-v5.1 changes.

show more ...


Revision tags: v5.0-rc5, v5.0-rc4, v5.0-rc3, v5.0-rc2
# d697bad5 09-Jan-2019 Petr Mladek <pmladek@suse.com>

livepatch: Remove Nop structures when unused

Replaced patches are removed from the stack when the transition is
finished. It means that Nop structures will never be needed again
and can be removed.

livepatch: Remove Nop structures when unused

Replaced patches are removed from the stack when the transition is
finished. It means that Nop structures will never be needed again
and can be removed. Why should we care?

+ Nop structures give the impression that the function is patched
even though the ftrace handler has no effect.

+ Ftrace handlers do not come for free. They cause slowdown that might
be visible in some workloads. The ftrace-related slowdown might
actually be the reason why the function is no longer patched in
the new cumulative patch. One would expect that cumulative patch
would help solve these problems as well.

+ Cumulative patches are supposed to replace any earlier version of
the patch. The amount of NOPs depends on which version was replaced.
This multiplies the amount of scenarios that might happen.

One might say that NOPs are innocent. But there are even optimized
NOP instructions for different processors, for example, see
arch/x86/kernel/alternative.c. And klp_ftrace_handler() is much
more complicated.

+ It sounds natural to clean up a mess that is no longer needed.
It could only be worse if we do not do it.

This patch allows to unpatch and free the dynamic structures independently
when the transition finishes.

The free part is a bit tricky because kobject free callbacks are called
asynchronously. We could not wait for them easily. Fortunately, we do
not have to. Any further access can be avoided by removing them from
the dynamic lists.

Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

show more ...


# e1452b60 09-Jan-2019 Jason Baron <jbaron@akamai.com>

livepatch: Add atomic replace

Sometimes we would like to revert a particular fix. Currently, this
is not easy because we want to keep all other fixes active and we
could revert only the last applied

livepatch: Add atomic replace

Sometimes we would like to revert a particular fix. Currently, this
is not easy because we want to keep all other fixes active and we
could revert only the last applied patch.

One solution would be to apply new patch that implemented all
the reverted functions like in the original code. It would work
as expected but there will be unnecessary redirections. In addition,
it would also require knowing which functions need to be reverted at
build time.

Another problem is when there are many patches that touch the same
functions. There might be dependencies between patches that are
not enforced on the kernel side. Also it might be pretty hard to
actually prepare the patch and ensure compatibility with the other
patches.

Atomic replace && cumulative patches:

A better solution would be to create cumulative patch and say that
it replaces all older ones.

This patch adds a new "replace" flag to struct klp_patch. When it is
enabled, a set of 'nop' klp_func will be dynamically created for all
functions that are already being patched but that will no longer be
modified by the new patch. They are used as a new target during
the patch transition.

The idea is to handle Nops' structures like the static ones. When
the dynamic structures are allocated, we initialize all values that
are normally statically defined.

The only exception is "new_func" in struct klp_func. It has to point
to the original function and the address is known only when the object
(module) is loaded. Note that we really need to set it. The address is
used, for example, in klp_check_stack_func().

Nevertheless we still need to distinguish the dynamically allocated
structures in some operations. For this, we add "nop" flag into
struct klp_func and "dynamic" flag into struct klp_object. They
need special handling in the following situations:

+ The structures are added into the lists of objects and functions
immediately. In fact, the lists were created for this purpose.

+ The address of the original function is known only when the patched
object (module) is loaded. Therefore it is copied later in
klp_init_object_loaded().

+ The ftrace handler must not set PC to func->new_func. It would cause
infinite loop because the address points back to the beginning of
the original function.

+ The various free() functions must free the structure itself.

Note that other ways to detect the dynamic structures are not considered
safe. For example, even the statically defined struct klp_object might
include empty funcs array. It might be there just to run some callbacks.

Also note that the safe iterator must be used in the free() functions.
Otherwise already freed structures might get accessed.

Special callbacks handling:

The callbacks from the replaced patches are _not_ called by intention.
It would be pretty hard to define a reasonable semantic and implement it.

It might even be counter-productive. The new patch is cumulative. It is
supposed to include most of the changes from older patches. In most cases,
it will not want to call pre_unpatch() post_unpatch() callbacks from
the replaced patches. It would disable/break things for no good reasons.
Also it should be easier to handle various scenarios in a single script
in the new patch than think about interactions caused by running many
scripts from older patches. Not to say that the old scripts even would
not expect to be called in this situation.

Removing replaced patches:

One nice effect of the cumulative patches is that the code from the
older patches is no longer used. Therefore the replaced patches can
be removed. It has several advantages:

+ Nops' structs will no longer be necessary and might be removed.
This would save memory, restore performance (no ftrace handler),
allow clear view on what is really patched.

+ Disabling the patch will cause using the original code everywhere.
Therefore the livepatch callbacks could handle only one scenario.
Note that the complication is already complex enough when the patch
gets enabled. It is currently solved by calling callbacks only from
the new cumulative patch.

+ The state is clean in both the sysfs interface and lsmod. The modules
with the replaced livepatches might even get removed from the system.

Some people actually expected this behavior from the beginning. After all
a cumulative patch is supposed to "completely" replace an existing one.
It is like when a new version of an application replaces an older one.

This patch does the first step. It removes the replaced patches from
the list of patches. It is safe. The consistency model ensures that
they are no longer used. By other words, each process works only with
the structures from klp_transition_patch.

The removal is done by a special function. It combines actions done by
__disable_patch() and klp_complete_transition(). But it is a fast
track without all the transaction-related stuff.

Signed-off-by: Jason Baron <jbaron@akamai.com>
[pmladek@suse.com: Split, reuse existing code, simplified]
Signed-off-by: Petr Mladek <pmladek@suse.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Miroslav Benes <mbenes@suse.cz>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

show more ...


# 19514910 09-Jan-2019 Petr Mladek <pmladek@suse.com>

livepatch: Change unsigned long old_addr -> void *old_func in struct klp_func

The address of the to be patched function and new function is stored
in struct klp_func as:

void *new_func;
unsigned

livepatch: Change unsigned long old_addr -> void *old_func in struct klp_func

The address of the to be patched function and new function is stored
in struct klp_func as:

void *new_func;
unsigned long old_addr;

The different naming scheme and type are derived from the way
the addresses are set. @old_addr is assigned at runtime using
kallsyms-based search. @new_func is statically initialized,
for example:

static struct klp_func funcs[] = {
{
.old_name = "cmdline_proc_show",
.new_func = livepatch_cmdline_proc_show,
}, { }
};

This patch changes unsigned long old_addr -> void *old_func. It removes
some confusion when these address are later used in the code. It is
motivated by a followup patch that adds special NOP struct klp_func
where we want to assign func->new_func = func->old_addr respectively
func->new_func = func->old_func.

This patch does not modify the existing behavior.

Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Alice Ferrazzi <alice.ferrazzi@gmail.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

show more ...


# 23d19ba0 11-Jan-2019 Maxime Ripard <maxime.ripard@bootlin.com>

Merge drm/drm-next into drm-misc-next

drm-next has been forwarded to 5.0-rc1, and we need it to apply the damage
helper for dirtyfb series from Noralf Trønnes.

Signed-off-by: Maxime Ripard <maxime.

Merge drm/drm-next into drm-misc-next

drm-next has been forwarded to 5.0-rc1, and we need it to apply the damage
helper for dirtyfb series from Noralf Trønnes.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

show more ...


# 49e41801 10-Jan-2019 James Morris <james.morris@microsoft.com>

Merge tag 'v5.0-rc1' into next-general

Linux 5.0-rc1

Sync to pick up LSM stacking work (which is based on -rc1).


# 3eb0930a 08-Jan-2019 Jani Nikula <jani.nikula@intel.com>

Merge drm/drm-next into drm-intel-next-queued

Generally catch up with 5.0-rc1, and specifically get the changes:

96d4f267e40f ("Remove 'type' argument from access_ok() function")
0b2c8f8b6b0c ("i91

Merge drm/drm-next into drm-intel-next-queued

Generally catch up with 5.0-rc1, and specifically get the changes:

96d4f267e40f ("Remove 'type' argument from access_ok() function")
0b2c8f8b6b0c ("i915: fix missing user_access_end() in page fault exception case")
594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'")

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

show more ...


Revision tags: v5.0-rc1
# 792bf4d8 26-Dec-2018 Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU updates from Ingo Molnar:
"The biggest RCU changes in this cycle were:

- Convert RCU's BUG_ON

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU updates from Ingo Molnar:
"The biggest RCU changes in this cycle were:

- Convert RCU's BUG_ON() and similar calls to WARN_ON() and similar.

- Replace calls of RCU-bh and RCU-sched update-side functions to
their vanilla RCU counterparts. This series is a step towards
complete removal of the RCU-bh and RCU-sched update-side functions.

( Note that some of these conversions are going upstream via their
respective maintainers. )

- Documentation updates, including a number of flavor-consolidation
updates from Joel Fernandes.

- Miscellaneous fixes.

- Automate generation of the initrd filesystem used for rcutorture
testing.

- Convert spin_is_locked() assertions to instead use lockdep.

( Note that some of these conversions are going upstream via their
respective maintainers. )

- SRCU updates, especially including a fix from Dennis Krein for a
bag-on-head-class bug.

- RCU torture-test updates"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (112 commits)
rcutorture: Don't do busted forward-progress testing
rcutorture: Use 100ms buckets for forward-progress callback histograms
rcutorture: Recover from OOM during forward-progress tests
rcutorture: Print forward-progress test age upon failure
rcutorture: Print time since GP end upon forward-progress failure
rcutorture: Print histogram of CB invocation at OOM time
rcutorture: Print GP age upon forward-progress failure
rcu: Print per-CPU callback counts for forward-progress failures
rcu: Account for nocb-CPU callback counts in RCU CPU stall warnings
rcutorture: Dump grace-period diagnostics upon forward-progress OOM
rcutorture: Prepare for asynchronous access to rcu_fwd_startat
torture: Remove unnecessary "ret" variables
rcutorture: Affinity forward-progress test to avoid housekeeping CPUs
rcutorture: Break up too-long rcu_torture_fwd_prog() function
rcutorture: Remove cbflood facility
torture: Bring any extra CPUs online during kernel startup
rcutorture: Add call_rcu() flooding forward-progress tests
rcutorture/formal: Replace synchronize_sched() with synchronize_rcu()
tools/kernel.h: Replace synchronize_sched() with synchronize_rcu()
net/decnet: Replace rcu_barrier_bh() with rcu_barrier()
...

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Revision tags: v4.20, v4.20-rc7, v4.20-rc6
# 4bbfd746 04-Dec-2018 Ingo Molnar <mingo@kernel.org>

Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

Pull RCU changes from Paul E. McKenney:

- Convert RCU's BUG_ON() and similar calls to WARN_

Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

Pull RCU changes from Paul E. McKenney:

- Convert RCU's BUG_ON() and similar calls to WARN_ON() and similar.

- Replace calls of RCU-bh and RCU-sched update-side functions
to their vanilla RCU counterparts. This series is a step
towards complete removal of the RCU-bh and RCU-sched update-side
functions.

( Note that some of these conversions are going upstream via their
respective maintainers. )

- Documentation updates, including a number of flavor-consolidation
updates from Joel Fernandes.

- Miscellaneous fixes.

- Automate generation of the initrd filesystem used for
rcutorture testing.

- Convert spin_is_locked() assertions to instead use lockdep.

( Note that some of these conversions are going upstream via their
respective maintainers. )

- SRCU updates, especially including a fix from Dennis Krein
for a bag-on-head-class bug.

- RCU torture-test updates.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

show more ...


Revision tags: v4.20-rc5
# eaaf055f 01-Dec-2018 Paul E. McKenney <paulmck@linux.ibm.com>

Merge branches 'bug.2018.11.12a', 'consolidate.2018.12.01a', 'doc.2018.11.12a', 'fixes.2018.11.12a', 'initrd.2018.11.08b', 'sil.2018.11.12a' and 'srcu.2018.11.27a' into HEAD

bug.2018.11.12a: Get ri

Merge branches 'bug.2018.11.12a', 'consolidate.2018.12.01a', 'doc.2018.11.12a', 'fixes.2018.11.12a', 'initrd.2018.11.08b', 'sil.2018.11.12a' and 'srcu.2018.11.27a' into HEAD

bug.2018.11.12a: Get rid of BUG_ON() and friends
consolidate.2018.12.01a: Continued RCU flavor-consolidation cleanup
doc.2018.11.12a: Documentation updates
fixes.2018.11.12a: Miscellaneous fixes
initrd.2018.11.08b: Automate creation of rcutorture initrd
sil.2018.11.12a: Remove more spin_unlock_wait() calls

show more ...


Revision tags: v4.20-rc4, v4.20-rc3, v4.20-rc2
# 6932689e 07-Nov-2018 Paul E. McKenney <paulmck@linux.ibm.com>

livepatch: Replace synchronize_sched() with synchronize_rcu()

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can

livepatch: Replace synchronize_sched() with synchronize_rcu()

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can be
replaced by synchronize_rcu(). This commit therefore makes this change,
even though it is but a comment.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

show more ...


Revision tags: v4.20-rc1, v4.19, v4.19-rc8, v4.19-rc7, v4.19-rc6, v4.19-rc5, v4.19-rc4, v4.19-rc3, v4.19-rc2, v4.19-rc1, v4.18, v4.18-rc8, v4.18-rc7, v4.18-rc6, v4.18-rc5, v4.18-rc4, v4.18-rc3, v4.18-rc2, v4.18-rc1, v4.17, v4.17-rc7, v4.17-rc6, v4.17-rc5, v4.17-rc4, v4.17-rc3, v4.17-rc2, v4.17-rc1
# 664b0bae 05-Apr-2018 Dmitry Torokhov <dmitry.torokhov@gmail.com>

Merge branch 'next' into for-linus

Prepare input updates for 4.17 merge window.


Revision tags: v4.16, v4.16-rc7, v4.16-rc6, v4.16-rc5, v4.16-rc4, v4.16-rc3, v4.16-rc2, v4.16-rc1
# 10a55837 01-Feb-2018 Dmitry Torokhov <dmitry.torokhov@gmail.com>

Merge tag 'v4.15' into next

Sync with mainline to get in trackpoint updates and other changes.


# c86aa012 31-Jan-2018 Jiri Kosina <jkosina@suse.cz>

Merge branches 'for-4.16/upstream' and 'for-4.15/upstream-fixes' into for-linus

Pull assorted small fixes queued for merge window.


# 7e86548e 30-Jan-2018 Ingo Molnar <mingo@kernel.org>

Merge tag 'v4.15' into x86/pti, to be able to merge dependent changes

Time has come to switch PTI development over to a v4.15 base - we'll still
try to make sure that all PTI fixes backport cleanly

Merge tag 'v4.15' into x86/pti, to be able to merge dependent changes

Time has come to switch PTI development over to a v4.15 base - we'll still
try to make sure that all PTI fixes backport cleanly to v4.14 and earlier.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

show more ...


# ddb9e13a 29-Jan-2018 Juergen Gross <jgross@suse.com>

Merge branch 'master' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/torvalds/linux


Revision tags: v4.15
# 0b5eca67 25-Jan-2018 Mark Brown <broonie@kernel.org>

Merge branches 'topic/twl4030' and 'topic/twl6040' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-twl-breakage


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