On Thu, Jan 23, 2020 at 10:03 AM Linus Torvalds
wrote:
> We used to have a read/write argument to the old "verify_area()" and
> "access_ok()" model, and it was a mistake. It was due to odd i386 user
> access issues. We got rid of it. I'm not convinced this is any better
> - it looks very similar a
On Fri, Jan 24, 2020 at 9:07 AM Aneesh Kumar K.V
wrote:
>
> On 1/24/20 10:15 PM, Dan Williams wrote:
> > On Thu, Jan 23, 2020 at 11:34 PM Aneesh Kumar K.V
> > wrote:
> >>
> >> On 1/24/20 11:27 AM, Dan Williams wrote:
> >>> On Mon, Jan 20, 2020 at 6:08 AM Aneesh Kumar K.V
> >>>
> >>
> >>
> >>
The pull request you sent on Fri, 24 Jan 2020 23:13:30 +1100:
> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
> tags/powerpc-5.5-6
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/3c45d7510cf563be2ebc04f6864b70bc69f68cb9
Thank you!
--
Deet-doot-do
On 1/24/20 10:15 PM, Dan Williams wrote:
On Thu, Jan 23, 2020 at 11:34 PM Aneesh Kumar K.V
wrote:
On 1/24/20 11:27 AM, Dan Williams wrote:
On Mon, Jan 20, 2020 at 6:08 AM Aneesh Kumar K.V
+unsigned long arch_namespace_map_size(void)
+{
+ return PAGE_SIZE;
+}
+EXPORT_SYMBOL_GP
Since commit b86fb88855ea ("powerpc/32: implement fast entry for
syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32:
implement fast entry for syscalls on BOOKE"), syscalls from
kernel are unexpected and can have catastrophic consequences
as it will destroy the kernel stack.
Test MSR_PR o
After reactivation of data translation by modifying MSR[DR], a isync
is required to ensure the translation is effective.
Signed-off-by: Christophe Leroy
---
Rebased on powerpc/merge-test
@mpe: If not too late:
- change to head_32.h should be squashed into "powerpc/32: prepare for
CONFIG_VMAP_ST
On Jan 22 2020, Rasmus Villemoes wrote:
> So the inode number and mtime/ctime are exactly the same, but for some
> reason Blocks: has changed? This is on an ext4 filesystem, but I don't
> suspect the filesystem to be broken, because it's always just vmlinux
> that ends up corrupt, and always in ex
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Hi Linus,
Please pull some more powerpc fixes for 5.5:
The following changes since commit 6da3eced8c5f3b03340b0c395bacd552c4d52411:
powerpc/spinlocks: Include correct header for static key (2019-12-30 21:20:41
+1100)
are available in the git r
Implement user_access_save() and user_access_restore()
On 8xx and radix:
- On save, get the value of the associated special register
then prevent user access.
- On restore, set back the saved value to the associated special
register.
On book3s/32:
- On save, get the value stored in current->threa
Today, when a function like strncpy_from_user() is called,
the userspace access protection is de-activated and re-activated
for every word read.
By implementing user_access_begin and friends, the protection
is de-activated at the beginning of the copy and re-activated at the
end.
Implement user_a
In preparation of implementing user_access_begin and friends
on powerpc, the book3s/32 version of prevent_user_access() need
to be prepared for user_access_end().
user_access_end() doesn't provide the address and size which
were passed to user_access_begin(), required by prevent_user_access()
to k
NULL addr is a user address. Don't waste time checking it. If
someone tries to access it, it will SIGFAULT the same way as for
address 1, so no need to make it special.
The special case is when not doing a write, in that case we want
to drop the entire function. This is now handled by 'dir' param
__builtin_constant_p() always return 0 for pointers, so on RADIX
we always end up opening both direction (by writing 0 in SPR29):
0170 <._copy_to_user>:
...
1b0: 4c 00 01 2c isync
1b4: 39 20 00 00 li r9,0
1b8: 7d 3d 03 a6 mtspr 29,r9
1bc: 4c 00 01 2c
At the moment, bad_kuap_fault() reports a fault only if a bad access
to userspace occurred while access to userspace was not granted.
But if a fault occurs for a write outside the allowed userspace
segment(s) that have been unlocked, bad_kuap_fault() fails to
detect it and the kernel loops forever
From: Linus Torvalds
In commit 9f79b78ef744 ("Convert filldir[64]() from __put_user() to
unsafe_put_user()") I changed filldir to not do individual __put_user()
accesses, but instead use unsafe_put_user() surrounded by the proper
user_access_begin/end() pair.
That make them enormously faster on
Ulf Hansson writes:
> On Thu, 16 Jan 2020 at 12:18, Christian Zigotzky
> wrote:
>>
>> Hi All,
>>
>> We still need the attached patch for our onboard SD card interface
>> [1,2]. Could you please add this patch to the tree?
>
> No, because according to previous discussion that isn't the correct
>
Le 23/01/2020 à 13:31, Michael Ellerman a écrit :
Michael Ellerman writes:
Christophe Leroy writes:
Today, when a function like strncpy_from_user() is called,
the userspace access protection is de-activated and re-activated
for every word read.
By implementing user_access_begin and friend
From: Ravi Bangoria
[ Upstream commit 913a90bc5a3a06b1f04c337320e9aeee2328dd77 ]
perf_event_open() limits the sample_period to 63 bits. See:
0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits")
Make ioctl() consistent with it.
Also on PowerPC, negative sample_period could
On 24/01/2020 11.50, Michael Ellerman wrote:
> Rasmus Villemoes writes:
>> I'm building for a ppc32 (mpc8309) target using Yocto, and I'm hitting a
>> very hard to debug problem that maybe someone else has encountered. This
>> doesn't happen always, perhaps 1 in 8 times or something like that.
>>
Rasmus Villemoes writes:
> I'm building for a ppc32 (mpc8309) target using Yocto, and I'm hitting a
> very hard to debug problem that maybe someone else has encountered. This
> doesn't happen always, perhaps 1 in 8 times or something like that.
>
> The issue is that when the build gets to do "${CR
Linus Torvalds writes:
> On Thu, Jan 23, 2020 at 4:00 AM Michael Ellerman wrote:
>>
>> So I guess I'll wait and see what happens with patch 1.
>
> I've committed my fixes to filldir[64]() directly - they really were
> fixing me being lazy about the range, and the name length checking
> really is
From: Ravi Bangoria
[ Upstream commit 913a90bc5a3a06b1f04c337320e9aeee2328dd77 ]
perf_event_open() limits the sample_period to 63 bits. See:
0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits")
Make ioctl() consistent with it.
Also on PowerPC, negative sample_period could
On Fri, Jan 24, 2020 at 07:03:36AM +, Christophe Leroy wrote:
> >Le 24/01/2020 à 06:46, Michael Ellerman a écrit :
> >>
> >>If I do this it seems to work, but feels a little dicey:
> >>
> >>asm ("" : "=r" (r1));
> >>sp = r1 & (THREAD_SIZE - 1);
> >
> >
> >Or we could do add in asm/reg.h
Hi!
On Fri, Jan 24, 2020 at 04:46:24PM +1100, Michael Ellerman wrote:
> Christophe Leroy writes:
> > static inline void check_stack_overflow(void)
> > {
> > #ifdef CONFIG_DEBUG_STACKOVERFLOW
> > - long sp;
> > -
> > - sp = current_stack_pointer() & (THREAD_SIZE-1);
> > + register unsigne
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