s stored in the lowcore_ptr[] array.
>
> When lowcore is accessed through virtual address 0, one needs to
> resolve metadata for lowcore_ptr[raw_smp_processor_id()].
>
> Expose kmsan_get_metadata() to make it possible to do this from the
> arch code.
>
> Signed-off-by: I
On Thu, Jun 13, 2024 at 5:40 PM Ilya Leoshkevich wrote:
>
> Now that everything else is in place, enable KMSAN in Kconfig.
>
> Acked-by: Heiko Carstens
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
On Wed, Jun 19, 2024 at 5:45 PM Ilya Leoshkevich wrote:
>
> Add a wrapper for memset() that prevents unpoisoning. This is useful
> for filling memory allocator redzones.
>
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
> ---
> include/linux/kmsan.h |
gt; it directly.
>
> Suggested-by: Alexander Potapenko
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
size);
> break;
> case 4:
> - rc = __get_user_asm((unsigned int *)x,
> + rc = __get_user_int((unsigned int *)x,
> (unsigned int __user *)ptr,
> size)
ess_enable() is to touch poisoned
> metadata without triggering KMSAN, is to unpoison its return value.
> However, this approach is too fragile. So simply disable the KMSAN
> checks in the respective functions.
>
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
On Thu, Jun 20, 2024 at 1:19 PM Ilya Leoshkevich wrote:
>
> On Thu, 2024-06-20 at 10:36 +0200, Alexander Potapenko wrote:
> > On Wed, Jun 19, 2024 at 5:45 PM Ilya Leoshkevich
> > wrote:
> > >
> > > put_user() uses inline assembly with precise constraints,
On Thu, Jun 20, 2024 at 3:38 PM Ilya Leoshkevich wrote:
>
> On Thu, 2024-06-20 at 11:25 +0200, Alexander Gordeev wrote:
> > On Wed, Jun 19, 2024 at 05:44:11PM +0200, Ilya Leoshkevich wrote:
> >
> > Hi Ilya,
> >
> > > +static inline bool is_lowcore_addr(void *addr)
> > > +{
> > > + return addr >=
On Thu, Jun 20, 2024 at 4:18 PM Alexander Potapenko wrote:
>
> On Thu, Jun 20, 2024 at 3:38 PM Ilya Leoshkevich wrote:
> >
> > On Thu, 2024-06-20 at 11:25 +0200, Alexander Gordeev wrote:
> > > On Wed, Jun 19, 2024 at 05:44:11PM +0200, Ilya Leoshkevich
uninitialized memory and UAF.
>
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
On Fri, Jun 21, 2024 at 2:27 AM Ilya Leoshkevich wrote:
>
> Add KMSAN vmalloc metadata areas to kernel_page_tables.
>
> Signed-off-by: Ilya Leoshkevich
Reviewed-by: Alexander Potapenko
eoshkevich
Reviewed-by: Alexander Potapenko
case, since the allocation
> is ephemeral for the lifespan of the namespace, there are no explicit
> restriction. However, the implicit restriction, of having enough
> available "System RAM" to store the page map for the typically large
> pmem, still applies.
>
> Fixes: 6
---
> > This bug is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkal...@googlegroups.com.
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/
#syz fix: sctp: handle two v4 addrs comparison in sctp_inet6_cmp_addr
committed for memcmp())
Signed-off-by: Alexander Potapenko
Cc: Andrey Ryabinin
Cc: Dmitry Vyukov
---
lib/stackdepot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index e513459a5601..d48c744fa750 100644
--- a/lib/stackdepot.c
+++ b/lib
On Tue, Apr 2, 2019 at 9:27 AM Peter Zijlstra wrote:
>
>
>
> On Mon, Apr 01, 2019 at 06:24:08PM +0200, Alexander Potapenko wrote:
> > diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
> > index d153d570bb04..20e4950827d9 100644
> > --- a
makes the compiler
treat sizeof(long) bytes as being clobbered, which isn't the case. This
may theoretically lead to worse code in the case of heavy optimization.
Signed-off-by: Alexander Potapenko
Cc: Dmitry Vyukov
Cc: Paul E. McKenney
Cc: H. Peter Anvin
Cc: Peter Zijlstra
Cc: James Y Kni
On Tue, Apr 2, 2019 at 10:59 AM Alexander Potapenko wrote:
>
> On Tue, Apr 2, 2019 at 9:27 AM Peter Zijlstra wrote:
> >
> >
> >
> > On Mon, Apr 01, 2019 at 06:24:08PM +0200, Alexander Potapenko wrote:
> > > diff --git a/arch/x86/include/asm/bitops.h b/ar
On Tue, Apr 2, 2019 at 1:28 PM Alexander Potapenko wrote:
>
> 1. Use memory clobber in bitops that touch arbitrary memory
>
> Certain bit operations that read/write bits take a base pointer and an
> arbitrarily large offset to address the bit relative to that base.
> Inline as
On Tue, Apr 2, 2019 at 1:44 PM David Laight wrote:
>
> From: Alexander Potapenko
> > Sent: 02 April 2019 12:28
> >
> > 1. Use memory clobber in bitops that touch arbitrary memory
> >
> > Certain bit operations that read/write bits take a base pointer and an
>
On Tue, Apr 2, 2019 at 2:35 PM Alexander Potapenko wrote:
>
> On Tue, Apr 2, 2019 at 1:44 PM David Laight wrote:
> >
> > From: Alexander Potapenko
> > > Sent: 02 April 2019 12:28
> > >
> > > 1. Use memory clobber in bitops that touch arbitrary memory
f-by: Thomas Gleixner
Acked-by: Alexander Potapenko
> ---
> include/linux/stackdepot.h |4 ++
> lib/stackdepot.c | 66
> -
> 2 files changed, 51 insertions(+), 19 deletions(-)
>
> --- a/include/linux/stackdepot.h
>
On Wed, Apr 10, 2019 at 1:06 PM Thomas Gleixner wrote:
>
> No more users of the struct stack_trace based interfaces.
>
> Signed-off-by: Thomas Gleixner
Acked-by: Alexander Potapenko
> ---
> include/linux/stackdepot.h |4
> lib/stackdepot.c | 20
e(), as it seems to be
> a more fitting name.
>
> Suggested-by: Marco Elver
> Signed-off-by: Andrey Konovalov
> Link:
> https://linux-review.googlesource.com/id/I719cc93483d4ba288a634dba80ee6b7f2809cd26
Reviewed-by: Alexander Potapenko
> ---
> mm/kasan/common.c
lov
> Link:
> https://linux-review.googlesource.com/id/Iba2a6697e3c6304cb53f89ec61dedc77fa29e3ae
Reviewed-by: Alexander Potapenko
> ---
> Documentation/dev-tools/kasan.rst | 16 +++-
> 1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/
On Tue, Jan 5, 2021 at 7:28 PM Andrey Konovalov wrote:
>
> Clarify and update comments and info messages in KASAN tests.
>
> Signed-off-by: Andrey Konovalov
> Link:
> https://linux-review.googlesource.com/id/I6c816c51fa1e0eb7aa3dead6bda1f339d2af46c8
> void *kasan_ptr_result;
> int kasan_int_
On Tue, Jan 5, 2021 at 7:28 PM Andrey Konovalov wrote:
>
> Add 3 new tests for tag-based KASAN modes:
>
> 1. Check that match-all pointer tag is not assigned randomly.
> 2. Check that 0xff works as a match-all pointer tag.
> 3. Check that there are no match-all memory tags.
>
> Note, that test #3
view.googlesource.com/id/Id347dfa5fe8788b7a1a189863e039f409da0ae5f
Reviewed-by: Alexander Potapenko
> KASAN tests consist on two parts:
While at it: "consist of".
On Tue, Jan 5, 2021 at 7:28 PM Andrey Konovalov wrote:
>
> It might not be obvious to the compiler that the expression must be
> executed between writing and reading to fail_data. In this case, the
> compiler might reorder or optimize away some of the accesses, and
> the tests will fail.
Have you
Nit: s/adopt/adapt in the title.
> +again:
> ptr1 = kmalloc(size, GFP_KERNEL);
> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
>
> @@ -384,6 +386,13 @@ static void kmalloc_uaf2(struct kunit *test)
> ptr2 = kmalloc(size, GFP_KERNEL);
> KUNIT_ASSERT_NOT_ERR_OR_NULL(test,
On Tue, Jan 5, 2021 at 7:28 PM Andrey Konovalov wrote:
>
> Since the hardware tag-based KASAN mode might not have a redzone that
> comes after an allocated object (when kasan.mode=prod is enabled), the
> kasan_bitops_tags() test ends up corrupting the next object in memory.
>
> Change the test so
ink:
> https://linux-review.googlesource.com/id/Ia173d5a1b215fe6b2548d814ef0f4433cf983570
Reviewed-by: Alexander Potapenko
On Thu, Dec 10, 2020 at 6:01 AM wrote:
>
> From: Yogesh Lal
>
> Add a kernel parameter stack_hash_order to configure STACK_HASH_SIZE.
>
> Aim is to have configurable value for STACK_HASH_SIZE, so that one
> can configure it depending on usecase there by reducing the static
> memory overhead.
>
>
On Fri, Dec 11, 2020 at 1:45 PM Vijayanand Jitta wrote:
>
>
>
> On 12/11/2020 2:06 PM, Alexander Potapenko wrote:
> > On Thu, Dec 10, 2020 at 6:01 AM wrote:
> >>
> >> From: Yogesh Lal
> >>
> >> Add a kernel parameter stack_hash_order
On Mon, Dec 21, 2020 at 12:15 PM Vijayanand Jitta wrote:
>
>
>
> On 12/18/2020 2:10 PM, Vijayanand Jitta wrote:
> >
> >
> > On 12/17/2020 4:24 PM, Alexander Potapenko wrote:
> >>>> Can you provide an example of a use case in which the user wants to
>
> Michan, We would still need config option so that we can reduce the
> memory consumption on low ram devices using config.
>
> Alex, On this,
> "I also suppose device vendors may prefer setting a fixed (maybe
> non-default) hash size for low-memory devices rather than letting the
> admins increa
use this new feature.
Alexander Potapenko (4):
tracing: add error_report trace points
lib: add error_report_notify to collect debugging tools' reports
kfence: use error_report_start and error_report_end tracepoints
kasan: use error_report_start and error_report_end tracepoints
in
: Alexander Potapenko
---
include/trace/events/error_report.h | 51 +
kernel/trace/Makefile | 1 +
kernel/trace/error_report-traces.c | 11 +++
3 files changed, 63 insertions(+)
create mode 100644 include/trace/events/error_report.h
create mode
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
mm/kasan/report.c | 15 +--
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index c0fb21797550..fd015dd5dd39 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
: Petr Mladek
Cc: Steven Rostedt
Cc: Sergey Senozhatsky
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
lib/Kconfig.debug | 14 ++
lib/Makefile | 2 +
lib/error_report_notify.c | 278 ++
3 files changed, 294 insertions
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
mm/kfence/report.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/kfence/report.c b/mm/kfence/report.c
index 4dedc2ff8f28..5c063b5b2227 100644
--- a/mm/kfence/report.c
+++ b/mm/kfence/report.c
@@ -9,6 +9,7 @@
#include
On Tue, Jan 12, 2021 at 9:07 PM 'Andrey Konovalov' via kasan-dev
wrote:
>
> On Tue, Jan 12, 2021 at 9:30 AM Alexander Potapenko wrote:
> >
> > On Tue, Jan 5, 2021 at 7:28 PM Andrey Konovalov
> > wrote:
> > >
> > > Since the hardwar
ce.com/id/Ibfa458ef2804ff465d8eb07434a300bf36388d55
> Signed-off-by: Andrey Konovalov
Reviewed-by: Alexander Potapenko
> ---
> lib/test_kasan.c | 11 +++
> 1 file changed, 11 insertions(+)
>
> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index 283feda9882a..a1a35d75e
ros and use them.
> >
> > Link:
> > https://linux-review.googlesource.com/id/I237484a7fddfedf4a4aae9cc61ecbcdbe85a0a63
> > Suggested-by: Alexander Potapenko
> > Signed-off-by: Andrey Konovalov
>
> Nice!
>
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
On Mon, Jan 18, 2021 at 12:38 PM Petr Mladek wrote:
Thanks for your input! Some responses below.
>
> On Fri 2021-01-15 14:03:33, Alexander Potapenko wrote:
> > With the introduction of various production error-detection tools, such as
> > MTE-based KASAN and KFENCE,
> > > +
> > > + /* Pairs with acquire in last_report_show(). */
> > > + atomic_inc_return_release(&num_reports);
> > > + schedule_delayed_work(&reporting_done, 0);
> >
> > Why delayed work when it gets queued immediately?
>
> Because error reports may be sent from a place where waiting
On Wed, Jan 13, 2021 at 10:10 PM Steven Rostedt wrote:
>
> On Wed, 13 Jan 2021 10:16:54 +0100
> Alexander Potapenko wrote:
>
> > +DECLARE_EVENT_CLASS(error_report_template,
> > + TP_PROTO(const char *error_detector, unsigned long id),
>
> Instead
On Thu, Jan 14, 2021 at 1:06 AM Andrew Morton wrote:
>
> On Wed, 13 Jan 2021 10:16:55 +0100 Alexander Potapenko
> wrote:
>
> > With the introduction of various production error-detection tools, such as
> > MTE-based KASAN and KFENCE, the need arises to efficiently not
On Thu, Jan 14, 2021 at 10:51 AM Alexander Potapenko wrote:
>
> On Thu, Jan 14, 2021 at 1:06 AM Andrew Morton
> wrote:
> >
> > On Wed, 13 Jan 2021 10:16:55 +0100 Alexander Potapenko
> > wrote:
> >
> > > With the introduction of various production erro
On Thu, Jan 14, 2021 at 3:52 PM Steven Rostedt wrote:
>
> On Thu, 14 Jan 2021 08:49:57 +0100
> Alexander Potapenko wrote:
>
> > We'll need to explicitly list the enum values once again in
> > __print_symbolic(), right? E.g.:
> >
> > enum
On Thu, Mar 4, 2021 at 9:53 PM Marco Elver wrote:
>
> cache_alloc_debugcheck_after() performs checks on an object, including
> adjusting the returned pointer. None of this should apply to KFENCE
> objects. While for non-bulk allocations, the checks are skipped when we
> allocate via KFENCE, for bu
On Fri, Mar 5, 2021 at 2:31 AM Andrew Morton wrote:
>
> On Thu, 4 Mar 2021 22:05:48 +0100 Alexander Potapenko
> wrote:
>
> > On Thu, Mar 4, 2021 at 9:53 PM Marco Elver wrote:
> > >
> > > cache_alloc_debugcheck_after() performs checks on an object, including
On Wed, Mar 3, 2021 at 1:12 PM Marco Elver wrote:
>
> Use %td for ptrdiff_t.
>
> Link:
> https://lkml.kernel.org/r/3abbe4c9-16ad-c168-a90f-087978ccd...@csgroup.eu
> Reported-by: Christophe Leroy
> Signed-off-by: Marco Elver
Reviewed-by: Alexander Potapenko
disabling preemption around flush_tlb_one_kernel().
>
> Link: https://lore.kernel.org/lkml/ygidbaboelggm...@elver.google.com/
> Reported-by: Tomi Sarvela
> Signed-off-by: Marco Elver
Acked-by: Alexander Potapenko
gt; also avoids scanning the whole source string.
Looks like a good thing to do.
> Signed-off-by: Zhiyuan Dai
Acked-by: Alexander Potapenko
> ---
> mm/kasan/report_generic.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/kasan/report_generic.c b/
to kasan_unpoison_range(), and introduce internal
> functions (un)poison_range() (without kasan_ prefix).
>
> Co-developed-by: Marco Elver
> Signed-off-by: Marco Elver
> Signed-off-by: Andrey Konovalov
> Signed-off-by: Vincenzo Frascino
Reviewed-by
it.
>
> Signed-off-by: Andrey Konovalov
> Signed-off-by: Vincenzo Frascino
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
> ---
> Change-Id: I0b627b24187d06c8b9bb2f1d04d94b3d06945e73
> ---
> mm/kasan/init.c | 10 --
> mm/kas
co Elver
Reviewed-by: Alexander Potapenko
> ---
> Change-Id: Ib46cb444cfdee44054628940a82f5139e10d0258
> ---
> Documentation/dev-tools/kasan.rst | 80 +++
> 1 file changed, 59 insertions(+), 21 deletions(-)
>
> diff --git a/Documentation/dev-tools/kasan.
to
> allow the usage of ALTERNATIVE()s with MTE instructions.
>
> Signed-off-by: Vincenzo Frascino
> Signed-off-by: Andrey Konovalov
> Reviewed-by: Catalin Marinas
Reviewed-by: Alexander Potapenko
> ---
> Change-Id: I172e15e4c189f073e4c14a10276b276092e76536
> ---
feature for tag management and access checking.
>
> Signed-off-by: Andrey Konovalov
> Co-developed-by: Vincenzo Frascino
> Signed-off-by: Vincenzo Frascino
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
> ---
> Change-Id: I246c2def9fffa6563278db1bddfbe742ca7b
result the memset might result in a tag
> mismatch.
>
> Untag the address to avoid spurious faults.
>
> Cc: Andrew Morton
> Signed-off-by: Vincenzo Frascino
> Signed-off-by: Andrey Konovalov
Reviewed-by: Alexander Potapenko
> ---
> Change-Id: If12b4944383575b8bbd
> actually enabled")
> and 4c4c75881536 ("arm64, kfence: enable KFENCE for ARM64") went in the
> same day via different trees.
>
> Signed-off-by: Anders Roxell
Reviewed-by: Alexander Potapenko
Thanks!
> ---
>
> I got this build error in todays next-20201204.
> > Can you provide an example of a use case in which the user wants to
> > use the stack depot of a smaller size without disabling it completely,
> > and that size cannot be configured statically?
> > As far as I understand, for the page owner example you gave it's
> > sufficient to provide a swit
> > Signed-off-by: Marco Elver
Acked-by: Alexander Potapenko
> > ---
> > mm/kfence/kfence_test.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
> > index 1433a
prevent certain information leaks.
>
> Signed-off-by: Marco Elver
Acked-by: Alexander Potapenko
> ---
> mm/kfence/core.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/kfence/core.c b/mm/kfence/core.c
> index 3b8ec938470a..f7106f28443d 100644
> --- a
> [ 14.998426] BUG: KFENCE: invalid read in
> finish_task_switch.isra.0+0x54/0x23c
> [ 14.998426]
> [ 15.007061] Invalid read at 0x(ptrval):
> [ 15.010906] finish_task_switch.isra.0+0x54/0x23c
> [ 15.015633] kunit_try_run_case+0x5c/0xd0
> [ 15.019682] kunit_generic_run_threadfn_adap
On Fri, Jan 15, 2021 at 2:09 PM Alexander Potapenko wrote:
>
> On Fri, Jan 15, 2021 at 2:06 PM Vlastimil Babka wrote:
> >
> > Should have CCd linux-api@, please do next time
> Thanks, will do!
> Shall I also CC the v2 ABI patch explicitly?
I'll be dropping the sys
Thank you all for the comments!
Since concerns have been raised that another error reporting system
may quickly go out of control, we've decided to not pursue this
solution any further.
Instead, we will try to rely on existing ftrace mechanisms to deliver
notifications to the userspace, and perfor
gt; Signed-off-by: Vijayanand Jitta
Reviewed-by: Alexander Potapenko
> ---
> lib/Kconfig | 9 +
> lib/stackdepot.c | 3 +--
> 2 files changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/lib/Kconfig b/lib/Kconfig
> index b46a9fd..96ee125 100644
> --- a/
On Mon, Jan 18, 2021 at 11:54 PM Randy Dunlap wrote:
>
> On 1/18/21 1:56 AM, vji...@codeaurora.org wrote:
> > From: Yogesh Lal
> >
> > Use CONFIG_STACK_HASH_ORDER to configure STACK_HASH_SIZE.
> >
> > Aim is to have configurable value for STACK_HASH_SIZE,
> > so depend on use case one can config
use this new feature.
v2:
- added ABI documentation for /sys/kernel/error_report/
- changed error_report_start and error_report end tracepoints to take
a fixed set of values for the error detector
Alexander Potapenko (5):
tracing: add error_report trace points
lib: add
: Petr Mladek
Cc: Steven Rostedt
Cc: Sergey Senozhatsky
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
v2:
- s/memory error reports/error reports from debugging tools/
(per Andrew Morton's comment)
- change error_report_start and error_report_end prototypes
to accept
-error_report
new file mode 100644
index ..666d039f93a9
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-error_report
@@ -0,0 +1,41 @@
+What: /sys/kernel/error_report/
+Date: January 2021
+Contact: Alexander Potapenko ,
+ Marco Elver
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
v2:
- change error_report_start and error_report_end prototypes
to accept enum error_detector instead of char*
(as suggested by Steven Rostedt)
---
mm/kfence/report.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm
Cc: linux...@kvack.org
Signed-off-by: Alexander Potapenko
---
v2:
- change error_report_start and error_report_end prototypes
to accept enum error_detector instead of char*
(as suggested by Steven Rostedt)
---
mm/kasan/report.c | 15 +--
1 file changed, 9 insertions(+), 6
: Alexander Potapenko
---
v2: - change error_report_start and error_report_end prototypes
to accept enum error_detector instead of char*
(as suggested by Steven Rostedt)
---
include/trace/events/error_report.h | 84 +
kernel/trace/Makefile
On Fri, Jan 15, 2021 at 2:06 PM Vlastimil Babka wrote:
>
> Should have CCd linux-api@, please do next time
Thanks, will do!
Shall I also CC the v2 ABI patch explicitly?
On Thu, Jan 14, 2021 at 8:36 PM Andrey Konovalov wrote:
>
> Clarify and update comments in KASAN tests.
>
> Link:
> https://linux-review.googlesource.com/id/I6c816c51fa1e0eb7aa3dead6bda1f339d2af46c8
> Reviewed-by: Marco Elver
> Signed-off-by: Andrey Konovalov
Reviewed-by: Alexander Potapenko
gt;
> Note, that test #3 causes a significant number (255) of KASAN reports
> to be printed during execution for the SW_TAGS mode.
>
> Link:
> https://linux-review.googlesource.com/id/I78f1375efafa162b37f3abcb2c5bc2f3955dfd8e
> Reviewed-by: Marco Elver
> Signed-off-by: Andrey Konovalov
Reviewed-by: Alexander Potapenko
> https://linux-review.googlesource.com/id/I6447af436a69a94bfc35477f6bf4e2122948355e
> > Signed-off-by: Andrey Konovalov
>
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
ttps://linux-review.googlesource.com/id/I2a8bf797aecf81baeac61380c567308f319e263d
> > Signed-off-by: Andrey Konovalov
>
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
(see a nit below)
> > + cache = kmem_cache_create("test_cache", size, 0, 0, NULL)
t; pass _RET_IP_ to __kasan_check_byte().
> >
> > Also add a new ksize_uaf() test that checks that a use-after-free is
> > detected via ksize() itself, and via plain accesses that happen later.
> >
> > Link:
> > https://linux-review.googlesource.com/id/Iaabf771881d0f9ce1b969f2a62938e99d3308ec5
> > Signed-off-by: Andrey Konovalov
>
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
iew.googlesource.com/id/I8fb3c06d49671305ee184175a39591bc26647a67
> > Signed-off-by: Andrey Konovalov
>
> Much nicer!
>
> Reviewed-by: Marco Elver
Reviewed-by: Alexander Potapenko
d-off-by: Andrey Konovalov
Reviewed-by: Alexander Potapenko
rt count to ensure it
didn't change under their feet.
> Also, any reason you didn't cc: the sysfs maintainers?
Only my lack of common sense :)
I'll add them should the following patches rely on sysfs, thank you!
Alex
--
Alexander Potapenko
Software Engineer
Google Germany G
On Fri, Jan 15, 2021 at 2:50 PM Greg KH wrote:
>
> Minor comments, if in the future, you really do want to mess around in sysfs:
>
Thanks! Guess most of these comments apply even if I choose another FS
to mess around with.
> No copyright notice for the file? While acceptable, odds are your
> cor
hat we are planning to do.
Also, shall I rename the library/config/etc. accordingly (to e.g.
CONFIG_KERNEL_WARN_NOTIFY)?
> Use the function in kernel/trace/trace.c: tracer_init_tracefs() to add that
> directory. That's for files in the tracefs directory that will not be
> duplicate
On Mon, Jan 18, 2021 at 10:22 AM Marco Elver wrote:
>
> Add missing copyright and description headers to KFENCE source files.
>
> Signed-off-by: Marco Elver
Reviewed-by: Alexander Potapenko
> ---
> If appropriate, to be squashed into:
>
> mm: add Kernel Elect
On Mon, Jan 18, 2021 at 10:22 AM Marco Elver wrote:
>
> Add missing copyright and description header to KFENCE source file.
>
> Signed-off-by: Marco Elver
Reviewed-by: Alexander Potapenko
On Mon, Jan 18, 2021 at 10:22 AM Marco Elver wrote:
>
> Add missing copyright and description header to KFENCE source file.
>
> Signed-off-by: Marco Elver
Reviewed-by: Alexander Potapenko
On Mon, Jan 18, 2021 at 10:22 AM Marco Elver wrote:
>
> Add missing copyright header to KFENCE documentation.
>
> Signed-off-by: Marco Elver
Reviewed-by: Alexander Potapenko
On Wed, Dec 30, 2020 at 1:46 PM wrote:
>
> From: Yogesh Lal
>
> Use STACK_HASH_ORDER_SHIFT to configure STACK_HASH_SIZE.
I think "ORDER_SHIFT" is somewhat redundant, as "SMTH_ORDER" already
means this is a power of two we'll be using for shifting.
Leaving this up to you.
Alex
On Wed, Dec 16, 2020 at 4:43 AM Vijayanand Jitta wrote:
>
>
>
> On 12/14/2020 4:02 PM, Vijayanand Jitta wrote:
> >
> >
> > On 12/14/2020 3:04 PM, Alexander Potapenko wrote:
> >> On Mon, Dec 14, 2020 at 5:02 AM Vijayanand Jitta
> >> wrote:
> >
On Wed, Dec 16, 2020 at 2:06 PM Vijayanand Jitta wrote:
>
>
>
> On 12/16/2020 1:56 PM, Alexander Potapenko wrote:
> > On Wed, Dec 16, 2020 at 4:43 AM Vijayanand Jitta
> > wrote:
> >>
> >>
> >>
> >> On 12/14/2020 4:02 PM, Vijayanand Jit
t;>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>> --
> >>>>>>> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
> >>>>
On Mon, Dec 14, 2020 at 5:02 AM Vijayanand Jitta wrote:
>
>
>
> On 12/11/2020 6:55 PM, Alexander Potapenko wrote:
> > On Fri, Dec 11, 2020 at 1:45 PM Vijayanand Jitta
> > wrote:
> >>
> >>
> >>
> >> On 12/11/2020 2:06 PM, Alexander P
Hi James,
On Wed, Apr 13, 2016 at 6:12 PM, James Morse wrote:
> Hi Alex,
>
> On 12/04/16 12:17, Alexander Potapenko wrote:
>> I also wonder if we can, say, land the change to arch/arm64/Kconfig
>> separately from makefile changes that improve the precision or fix
>> c
gfp_t flags) {}
> -/* kasan_slab_free() returns true if the object has been put into quarantine.
> - */
> static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
> {
> return false;
> --
> 1.9.3
>
Acked-by: Alexander
On Mon, May 2, 2016 at 1:20 PM, Chen Gang wrote:
> On 5/2/16 18:49, Alexander Potapenko wrote:
>> On Mon, May 2, 2016 at 7:35 AM, wrote:
>>>
>>> According to their comments and the kasan_depth's initialization, if
>>> kasan_depth is zero, it means disabl
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