ange seems sensible. I don't expect this is common but it looks
painful to deal with if it happens.
Acked-by: "Eric W. Biederman"
I am wondering if this should be expanded to all ptrace types for
consistency. Or maybe we should set a flag to make this happen for
all ptrace events.
It jus
"Alejandro Colomar (man-pages)" writes:
> [CC += Thomas, Ingo, Peter, Darren]
>
> Hi Oleg,
>
> On 12/16/20 3:33 AM, Jann Horn wrote:
>> On Wed, Dec 16, 2020 at 3:21 AM Ted Estes wrote:
>>> On 12/15/2020 6:01 PM, Jann Horn wrote:
On Wed, Dec 16, 2020 at 12:25 AM Alejandro Colomar
Linus Torvalds writes:
> On Tue, Dec 15, 2020 at 3:00 PM Eric W. Biederman
> wrote:
>>
>> There is a minor conflict with parallel changes to the bpf task_iter
>> code. The changes don't fundamentally conflict but both are removing
>> code from same area
transform exec_update_mutex into a
rw_semaphore so readers can be separated from writers. This makes it
easier to understand what the holders of the lock are doing, and makes
it harder to contend or deadlock on the lock. The real deadlock fix
wound up in perf_event_open.
Eric W. Biederman (3):
ready for the merge window so that will have
to wait until next time.
Eric W. Biederman (28):
exec: Don't open code get_close_on_exec
exec: Move unshare_files to fix posix file locking during exec
exec: Simplify unshare_files
exec: Remove reset_files_struct
kcmp
e are fine for the forseeable
future.
Eric W. Biederman (1):
signal/parisc: Remove parisc specific definition of __ARCH_UAPI_SA_FLAGS
Helge Deller (1):
parisc: Drop parisc special case for __sighandler_t
Peter Collingbourne (6):
parisc: start using signal-defs.h
arch: move SA_* definitions
Casey Schaufler writes:
> On 12/13/2020 3:00 PM, Paul Moore wrote:
>> On Sun, Dec 13, 2020 at 11:30 AM Matthew Wilcox wrote:
>>> On Sun, Dec 13, 2020 at 08:22:32AM -0600, Eric W. Biederman wrote:
>>>> Matthew Wilcox writes:
>>>>
>>>>>
Stephen Brennan writes:
> ebied...@xmission.com (Eric W. Biederman) writes:
>
>> Stephen Brennan writes:
>>
>>> The pid_revalidate() function requires dropping from RCU into REF lookup
>>> mode. When many threads are resolving paths within /proc in pa
Stephen Brennan writes:
> The pid_revalidate() function requires dropping from RCU into REF lookup
> mode. When many threads are resolving paths within /proc in parallel,
> this can result in heavy spinlock contention as each thread tries to
> grab a reference to the /proc dentry lock (and drop
Matthew Wilcox writes:
> On Thu, Dec 03, 2020 at 04:02:12PM -0800, Stephen Brennan wrote:
>> -void pid_update_inode(struct task_struct *task, struct inode *inode)
>> +static int do_pid_update_inode(struct task_struct *task, struct inode
>> *inode,
>> + unsigned int
Davidlohr Bueso writes:
> On Tue, 08 Dec 2020, Peter Zijlstra wrote:
>
>>I suppose I'll queue the below into tip/perf/core for next merge window,
>>unless you want it in a hurry?
>
> I'm thinking we'd still want Eric's series on top of this for the reader
> benefits of the lock.
We will see
Peter Zijlstra writes:
> On Tue, Dec 08, 2020 at 12:27:39PM -0600, Eric W. Biederman wrote:
>> Peter Zijlstra writes:
>>
>> > On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
>> >
>> >> Do you want to pull these two into a topic
Al Viro writes:
> On Wed, Dec 09, 2020 at 03:32:38PM -0600, Eric W. Biederman wrote:
>> Al Viro writes:
>>
>> > On Wed, Dec 09, 2020 at 11:13:38AM -0800, Linus Torvalds wrote:
>> >> On Wed, Dec 9, 2020 at 10:0
Matthew Wilcox writes:
> On Wed, Dec 09, 2020 at 12:04:38PM -0600, Eric W. Biederman wrote:
>> @@ -397,8 +397,9 @@ static struct fdtable *close_files(struct files_struct *
>> files)
>> set = fdt->open_fds[j++];
>> while (set) {
>&
Linus Torvalds writes:
> On Wed, Dec 9, 2020 at 10:05 AM Eric W. Biederman
> wrote:
>>
>> - struct file * file = xchg(>fd[i], NULL);
>> + struct file * file = fdt->fd[i];
>>
Yahu Gao writes:
> There is a kernel NULL pointer dereference was found in Linux system.
> The details of kernel NULL is shown at bellow.
>
> Currently, we do not have a way to provoke this fault on purpose, but
> the reproduction rate in out CI loops is high enough that we could go
> for a
comes equivalent the helper function get_close_on_exec so
simplify the code and make it more robust by simply using
get_close_on_exec.
[1] https://lkml.kernel.org/r/2020120714.ga4115...@zeniv.linux.org.uk
Suggested-by: Al Viro
Signed-off-by: Eric W. Biederman
---
I aim to rebase my exec
Al Viro writes:
> On Wed, Dec 09, 2020 at 11:13:38AM -0800, Linus Torvalds wrote:
>> On Wed, Dec 9, 2020 at 10:05 AM Eric W. Biederman
>> wrote:
>> >
>> > - struct file * file = xchg(>fd[i],
>> > NULL);
>> &
The following commit has been merged into the locking/core branch of tip:
Commit-ID: 31784cff7ee073b34d6eddabb95e3be2880a425c
Gitweb:
https://git.kernel.org/tip/31784cff7ee073b34d6eddabb95e3be2880a425c
Author:Eric W. Biederman
AuthorDate:Thu, 03 Dec 2020 14:11:13 -06:00
The following commit has been merged into the locking/core branch of tip:
Commit-ID: 0f9368b5bf6db0c04afc5454b1be79022a681615
Gitweb:
https://git.kernel.org/tip/0f9368b5bf6db0c04afc5454b1be79022a681615
Author:Eric W. Biederman
AuthorDate:Thu, 03 Dec 2020 14:10:32 -06:00
This makes it safe to deference task->files with just rcu_read_lock
held, removing the need to take task_lock.
Signed-off-by: Eric W. Biederman
---
I have cleaned up my patch a little more and made this a little
more explicitly rcu. I took a completley different approach to
document
Peter Zijlstra writes:
> On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
>
>> Do you want to pull these two into a topic branch in the tip tree
>> based on v10-rc1?
>
> I'll go do that. I'll let the robots chew on it before pushing it out
> t
Peter Zijlstra writes:
> On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
>> On 12/3/20 3:11 PM, Eric W. Biederman wrote:
>
>> > +static inline int __down_read_interruptible(struct rw_semaphore *sem)
>> > +{
>> > + if (!rwsem_read_try
Vladimir Kondratiev writes:
> Please ignore version 1 of the patch - it was sent from wrong mail address.
>
> To clarify the reason:
>
> Situation where do_exit() re-entered, discovered by static code analysis.
> For safety critical system, it is better to panic() when minimal chance of
>
Davidlohr Bueso writes:
> On Fri, 04 Dec 2020, Linus Torvalds wrote:
>
>>On Fri, Dec 4, 2020 at 12:30 PM Bernd Edlinger
>> wrote:
>>> >perf_event_open (exec_update_mutex -> ovl_i_mutex)
>>
>>Side note: this one looks like it should be easy to fix.
>>
>>Is there any real reason why
Linus Torvalds writes:
> On Fri, Dec 4, 2020 at 11:35 AM Eric W. Biederman
> wrote:
>>
>> From a deadlock perspective the change is strictly better than what we
>> have today. The readers will no longer block on each other.
>
> No, agreed, it's better regardle
Linus Torvalds writes:
> On Fri, Dec 4, 2020 at 8:08 AM Bernd Edlinger
> wrote:
>>
>> >
>> > -static void kcmp_unlock(struct mutex *m1, struct mutex *m2)
>> > +static void kcmp_unlock(struct rw_semaphore *l1, struct rw_semaphore *l2)
>> > {
>> > - if (likely(m2 != m1))
>> > -
ct code is also
correct code on RT-linux. If not it is an RT-linux bug.
An rw_semaphore may be less than optimal on RT-linux. I do remember
that mutexes are prefered. But this change is more about correctness
than anything else.
> On 12/3/20 9:12 PM, Eric W. Biederman wrote:
>> --- a/kerne
guard_mutex")
[0] https://lkml.kernel.org/r/63640c05ade8e...@google.com
Reported-by: syzbot+db9cdf3dd1f64252c...@syzkaller.appspotmail.com
Signed-off-by: Eric W. Biederman
---
fs/exec.c| 12 ++--
fs/proc/base.c | 10 +-
include/linux/sched/sig
Zijlstra
Cc: Ingo Molnar
Cc: Will Deacon
Signed-off-by: Eric W. Biederman
---
include/linux/rwsem.h | 1 +
kernel/locking/rwsem.c | 26 ++
2 files changed, 27 insertions(+)
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 13021b08b2ed..4c715be48717 100644
Molnar
Cc: Will Deacon
Signed-off-by: Eric W. Biederman
---
include/linux/rwsem.h | 2 ++
kernel/locking/rwsem.c | 14 ++
2 files changed, 16 insertions(+)
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 25e3fde85617..13021b08b2ed 100644
--- a/include/linux/rwsem.h
it has the functionality needed
and uses a rw_semaphore to replace the current mutex.
Eric W. Biederman (3):
rwsem: Implement down_read_killable_nested
rwsem: Implement down_read_interruptible
exec: Transform exec_update_mutex into a rw_semaphore
fs/exec.c| 12
Alakesh Haloi writes:
> There has been at least one occurrence where a null pointer derefernce
> panic was seen with following stack trace.
>
> #0 [ff800bcd3800] machine_kexec at ff8008095fb4
> #1 [ff800bcd3860] __crash_kexec at ff8008122a30
> #2 [ff800bcd39f0] panic at
ebied...@xmission.com (Eric W. Biederman) writes:
> Now that unshare_files happens in begin_new_exec after the point of no
> return, io_uring_task_cancel can also happen later.
>
> Effectively this means io_uring activities for a task are only canceled
> when exec succeeds.
ebied...@xmission.com (Eric W. Biederman) writes:
> Oleg Nesterov recently asked[1] why is there an unshare_files in
> do_coredump. After digging through all of the callers of lookup_fd it
> turns out that it is
> arch/powerpc/platforms/cell/spufs/coredump.c:coredump_next_context
"Catangiu, Adrian Costin" writes:
> - Background
>
> The VM Generation ID is a feature defined by Microsoft (paper:
> http://go.microsoft.com/fwlink/?LinkId=260709) and supported by
> multiple hypervisor vendors.
>
> The feature is required in virtualized environments by apps that work
> with
Nit: The tag should have been "userns:" rather than kernel.
Giuseppe Scrivano writes:
> writing to the id map fails when an extent overlaps multiple mappings
> in the parent user namespace, e.g.:
>
> $ cat /proc/self/uid_map
> 0 1000 1
> 1 10
Oleg Nesterov writes:
> On 11/30, Eric W. Biederman wrote:
>>
>> Ouch Oleg I just looked the introduction of proc_inode_is_dead in
>> d855a4b79f49 ("proc: don't (ab)use ->group_leader in proc_task_readdir()
>> paths") introduced a ``regressio
Alakesh Haloi writes:
> There has been at least one occurrence where a null pointer derefernce
> panic was seen with following stack trace.
>
> #0 [ff800bcd3800] machine_kexec at ff8008095fb4
> #1 [ff800bcd3860] __crash_kexec at ff8008122a30
> #2 [ff800bcd39f0] panic at
Now that unshare_files happens in begin_new_exec after the point of no
return, io_uring_task_cancel can also happen later.
Effectively this means io_uring activities for a task are only canceled
when exec succeeds.
Signed-off-by: Eric W. Biederman
---
This is against my exec-for-v5.11 branch
Arnd Bergmann writes:
> On Wed, Nov 25, 2020 at 2:16 AM Eric W. Biederman
> wrote:
>> > On 11/24/20 12:14 PM, Arnd Bergmann wrote:
>> >
>> > There are still PS3-Linux users out there. They use 'Homebrew' firmware
>> > released through 'Hacker' forum
Stephen Brennan writes:
> The pid_revalidate() function requires dropping from RCU into REF lookup
> mode. When many threads are resolving paths within /proc in parallel,
> this can result in heavy spinlock contention as each thread tries to
> grab a reference to the /proc dentry (and drop it
Randy Dunlap writes:
> On 11/30/20 9:30 AM, Eric W. Biederman wrote:
>>
>> Randy Dunlap wrote:
>>> On 11/27/20 10:43 AM, Randy Dunlap wrote:
>>>
>>>> on parisc, _SA_SIGGFAULT is undefined and causing build errors.
>>>>
>>>&g
syzbot writes:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit:99c710c4 Merge tag 'platform-drivers-x86-v5.10-2' of git:/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12a77ddd50
> kernel config:
definitely not the place to look to close races.
Eric
> Signed-off-by: Wen Yang
> Cc: Oleg Nesterov
> Cc: "Eric W. Biederman"
> Cc: Alexey Dobriyan
> Cc: Christian Brauner
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-fsde...@vger.kernel.org
> ---
&g
dded.
Reported-by: Randy Dunlap
Fixes: 23acdc76f179 ("signal: clear non-uapi flag bits when passing/returning
sa_flags")
Signed-off-by: "Eric W. Biederman"
---
arch/parisc/include/asm/signal.h | 2 --
1 file changed, 2 deletions(-)
I am applying this trivial fix to my signal-f
Stephen Rothwell writes:
> Hi all,
>
> On Fri, 27 Nov 2020 10:43:07 -0800 Randy Dunlap wrote:
>>
>> On 11/27/20 1:04 AM, Stephen Rothwell wrote:
>> > Hi all,
>> >
>> > Changes since 20201126:
>> >
>>
>> on parisc, _SA_SIGGFAULT is undefined and causing build errors.
>>
>> commit
Stephen Rothwell writes:
> Hi all,
>
> Today's linux-next merge of the userns tree got a conflict in:
>
> kernel/bpf/task_iter.c
>
> between commit:
>
> 91b2db27d3ff ("bpf: Simplify task_file_seq_get_next()")
>
> from the bpf-next tree and commit:
>
> edc52f17257a ("bpf/task_iter: In
isn't shared")
[3] git://sourceware.org/git/binutils-gdb.git
[4] abf516c6931a ("Remove Cell Broadband Engine debugging support").
Signed-off-by: Eric W. Biederman
---
Does this change look good to people? I think it captures this state of
things and makes things clearer witho
Geoff Levand writes:
> On 11/24/20 12:14 PM, Arnd Bergmann wrote:
>> On Tue, Nov 24, 2020 at 8:58 PM Linus Torvalds
>> wrote:
>>>
>>> On Tue, Nov 24, 2020 at 11:55 AM Eric W. Biederman
>>> wrote:
>>>>
>>>> If cell happens
Miles Chen writes:
> When we try to visit the pagemap of a tagged userspace pointer, we find
> that the start_vaddr is not correct because of the tag.
> To fix it, we should untag the usespace pointers in pagemap_read().
>
> I tested with 5.10-rc4 and the issue remains.
>
> My test code is baed
Now that ksys_close is exactly identical to close_fd replace
the one caller of ksys_close with close_fd.
[1] https://lkml.kernel.org/r/20200818112020.ga17...@infradead.org
Suggested-by: Christoph Hellwig
Signed-off-by: "Eric W. Biederman"
---
fs/autofs/dev-ioctl.c| 5 +++--
inc
://lkml.kernel.org/r/20200817220425.9389-9-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/file.c | 21 +
include/linux/fdtable.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/fs/file.c b/fs/file.c
index 6448523ca29e..23b888a4acbe 100644
--- a
close() during
fdget()")
Signed-off-by: Eric W. Biederman
---
drivers/android/binder.c | 2 +-
fs/file.c| 4 ++--
fs/io_uring.c| 2 +-
include/linux/fdtable.h | 2 +-
4 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/android/binder.c b/drive
v1: https://lkml.kernel.org/r/20200817220425.9389-12-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/proc/fd.c | 9 +
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 72c1525b4b3e..cb51763ed554 100644
--- a/fs/proc/fd.c
Modify get_file_raw_ptr to use task_lookup_fd_rcu. The helper
task_lookup_fd_rcu does the work of taking the task lock and verifying
that task->files != NULL and then calls files_lookup_fd_rcu. So let
use the helper to make a simpler implementation of get_file_raw_ptr.
Signed-off-by: &quo
[1] dcfadfa4ec5a ("new helper: __alloc_fd()")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200817220425.9389-16-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/file.c
...@redhat.com
Suggested-by: Oleg Nesterov
v1: https://lkml.kernel.org/r/20200817220425.9389-11-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
kernel/bpf/task_iter.c | 44 ++
1 file changed, 10 insertions(+), 34 deletions(-)
diff --git a/
://lkml.kernel.org/r/20200817220425.9389-7-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/proc/fd.c | 7 +--
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 3dec44d7c5c5..c1a984f3c4df 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
a31...@redhat.com
Suggested-by: Oleg Nesterov
Tested-by: Andy Lavr
v1: https://lkml.kernel.org/r/20200817220425.9389-10-ebied...@xmission.com
Signed-off-by: Eric W. Biederman
---
fs/proc/fd.c | 17 +
1 file changed, 5 insertions(+), 12 deletions(-)
diff --git a/fs/proc/fd.c b/fs/proc/f
As a companion to lookup_fd_rcu implement task_lookup_fd_rcu for
querying an arbitrary process about a specific file.
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200818103713.aw46m7vprsy4vlve@wittgenstein
Signed-off-by: "Eric W. Biederman"
---
fs/file.c
t->files.
[1] f869e8a7f753 ("expose a low-level variant of fd_install() for binder")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner
v1:https://lkml.kernel.org/r/20200817220425.9389-14-ebied...@xmission.com
Signed-off-by: "Eric W. Bied
and fget_light remove get_files_struct
so that it does not gain any new users.
[1] https://lkml.kernel.org/r/20180915160423.ga31...@redhat.com
Suggested-by: Oleg Nesterov
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200817220425.9389-13-ebied...@xmission.com
Signed-off-by: "E
t;files.
[1] 483ce1d4b8c3 ("take descriptor-related part of close() to file.c")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200817220425.9389-17-ebied...@xmission.com
Signed-off-by: &qu
.
Further this causes alloc_fd to take all of the same arguments as
__alloc_fd except for the files_struct argument.
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200817220425.9389-15-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/file.c | 9 +
1 file
und of
discussion of this set of changes[1].
[1]
https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbrp...@mail.gmail.com
Signed-off-by: "Eric W. Biederman"
---
Documentation/filesystems/files.rst | 6 +++---
fs/file.c | 4 ++--
]
https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbrp...@mail.gmail.com
Signed-off-by: "Eric W. Biederman"
---
Documentation/filesystems/files.rst | 6 +++---
arch/powerpc/platforms/cell/spufs/coredump.c | 2 +-
fs/notify/dnotify/dnotify.c
.
[1] https://lkml.kernel.org/r/20180915160423.ga31...@redhat.com
Suggested-by: Oleg Nesterov
v1: https://lkml.kernel.org/r/20200817220425.9389-8-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/proc/fd.c | 13 +++--
1 file changed, 3 insertions(+), 10 deletion
il.com
Signed-off-by: "Eric W. Biederman"
---
fs/file.c | 2 +-
fs/locks.c | 14 --
fs/proc/fd.c| 2 +-
include/linux/fdtable.h | 7 +++
4 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/fs/file.c b/fs/file.c
in
of this set of changes[1].
[1]
https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbrp...@mail.gmail.com
Signed-off-by: "Eric W. Biederman"
---
fs/file.c | 2 +-
include/linux/fdtable.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff
in fget_light having to fallback to fget reducing
performance.
Suggested-by: Oleg Nesterov
Reviewed-by: Cyrill Gorcunov
v1: https://lkml.kernel.org/r/20200817220425.9389-4-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
kernel/kcmp.c | 20
1 file
/20180915160423.ga31...@redhat.com
Suggested-by: Oleg Nesterov
v1: https://lkml.kernel.org/r/20200817220425.9389-5-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
kernel/bpf/syscall.c | 20 +++-
1 file changed, 3 insertions(+), 17 deletions(-)
diff --git a/kernel/bpf
/r/20200817220425.9389-2-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman"
---
fs/coredump.c | 5 +
fs/exec.c | 5 +
include/linux/fdtable.h | 2 +-
kernel/fork.c | 12 ++--
4 files changed, 9 insertions(+), 15 deletions(-)
Now that exec no longer needs to restore the previous value of current->files
on error there are no more callers of reset_files_struct so remove it.
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/20200817220425.9389-3-ebied...@xmission.com
Signed-off-by: "Eric W. Biederman&q
23.21964-1-jlay...@kernel.org
[16] https://lkml.kernel.org/r/20180914105310.6454-1-jlay...@kernel.org
[17] https://lkml.kernel.org/r/87a7ohs5ow@xmission.com
[18] https://lkml.kernel.org/r/87pn8c1uj6.fsf...@x220.int.ebiederm.org
Acked-by: Christian Brauner
v1: https://lkml.kernel.org/r/202008
Thomas Gleixner writes:
> On Tue, Nov 17 2020 at 12:19, David Woodhouse wrote:
>> On Tue, 2020-11-17 at 10:53 +0100, Thomas Gleixner wrote:
>>> But that does not solve the problem either simply because then the IOMMU
>>> will catch the rogue MSIs and you get an interrupt storm on the IOMMU
>>>
Bjorn Helgaas writes:
> I don't think passing the device information to the kdump kernel is
> really practical. The kdump kernel would use it to do PCI config
> writes to disable MSIs before enabling IRQs, and it doesn't know how
> to access config space that early.
I don't think it is
ed
> callbacks in the PCI hotplug add/del path to update this information).
>
> [a]
> https://lore.kernel.org/lkml/1588812129-8596-1-git-send-email-anthony.yzn...@oracle.com/
>
> Below, inline reply to Eric's last message.
>
>
> On 15/11/2020 17:46, Eric W. Bi
Thomas Gleixner writes:
> On Sun, Nov 15 2020 at 08:29, Eric W. Biederman wrote:
>> ebied...@xmission.com (Eric W. Biederman) writes:
>> For ordinary irqs you can have this with level triggered irqs
>> and the kernel has code that will shutdown the irq at the ioapic
>&
ebied...@xmission.com (Eric W. Biederman) writes:
> Bjorn Helgaas writes:
>
>> [+cc Rafael for question about ACPI method for PCI host bridge reset]
>>
>> On Sat, Nov 14, 2020 at 09:58:08PM +0100, Thomas Gleixner wrote:
>>> On Sat, Nov 14 2020 at 14:39, Bjorn He
Bjorn Helgaas writes:
> [+cc Rafael for question about ACPI method for PCI host bridge reset]
>
> On Sat, Nov 14, 2020 at 09:58:08PM +0100, Thomas Gleixner wrote:
>> On Sat, Nov 14 2020 at 14:39, Bjorn Helgaas wrote:
>> > On Sat, Nov 14, 2020 at 12:40:10AM +0100, Thomas Gleixner wrote:
>> >> On
Miklos Szeredi writes:
> On Mon, Nov 9, 2020 at 7:54 PM Eric W. Biederman
> wrote:
>>
>> Miklos Szeredi writes:
>>
>> > On Mon, Nov 9, 2020 at 1:48 PM Alexey Gladkov
>> > wrote:
>> >>
>> >> This patch removes one kind of t
Miklos Szeredi writes:
> On Mon, Nov 9, 2020 at 1:48 PM Alexey Gladkov
> wrote:
>>
>> This patch removes one kind of the deadlocks inside the fuse daemon. The
>> problem appear when the fuse daemon itself makes a file operation on its
>> filesystem and receives a fatal signal.
>>
>> This
Jens Axboe writes:
> On 11/2/20 1:31 PM, Jens Axboe wrote:
>> On 11/2/20 1:12 PM, Eric W. Biederman wrote:
>>> Jens Axboe writes:
>>>
>>>> On 11/2/20 12:27 PM, Eric W. Biederman wrote:
>>>>> Jens Axboe writes:
>>>>>
>>
Jens Axboe writes:
> On 11/2/20 12:27 PM, Eric W. Biederman wrote:
>> Jens Axboe writes:
>>
>>> On 10/30/20 4:22 PM, Al Viro wrote:
>>>> On Fri, Oct 30, 2020 at 02:33:11PM -0600, Jens Axboe wrote:
>>>>> On 10/30/20 12:49 PM, Al Viro wrote:
&g
Jens Axboe writes:
> On 10/30/20 4:22 PM, Al Viro wrote:
>> On Fri, Oct 30, 2020 at 02:33:11PM -0600, Jens Axboe wrote:
>>> On 10/30/20 12:49 PM, Al Viro wrote:
On Fri, Oct 30, 2020 at 12:46:26PM -0600, Jens Axboe wrote:
> See other reply, it's being posted soon, just haven't
Jens Axboe writes:
> On 10/30/20 4:22 PM, Al Viro wrote:
>> On Fri, Oct 30, 2020 at 02:33:11PM -0600, Jens Axboe wrote:
>>> On 10/30/20 12:49 PM, Al Viro wrote:
On Fri, Oct 30, 2020 at 12:46:26PM -0600, Jens Axboe wrote:
> See other reply, it's being posted soon, just haven't
> Cc: Jonathan Corbet
> Cc: Vivek Goyal
> Cc: Eric W. Biederman
> Cc: Amir Goldstein
> Cc: Randy Dunlap
> Cc: Stephen Smalley
> Cc: John Stultz
> Cc: linux-...@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> To: linux-fsde...@vger.kernel.org
> To: li
was
created, while still supporting explicitly specified users and
groups to have fewer permissions.
Signed-off-by: Eric W. Biederman
---
So far only generic_permission is covered, but I think this demonstrates
that the goal is achievable. Preserving negative acls while allowing
setuid and setgroups
ebied...@xmission.com (Eric W. Biederman) writes:
> [ Added linux-api because we are talking about a subtle semantic
> change to the permission checks ]
>
> Christian Brauner writes:
>
>> On Sat, Oct 17, 2020 at 11:51:22AM -0500, Eric W. Biederman wrote:
>>> &qu
[ Added linux-api because we are talking about a subtle semantic
change to the permission checks ]
Christian Brauner writes:
> On Sat, Oct 17, 2020 at 11:51:22AM -0500, Eric W. Biederman wrote:
>> "Enrico Weigelt, metux IT consult" writes:
>>
>> > On 30.08
"Enrico Weigelt, metux IT consult" writes:
> On 30.08.20 16:39, Christian Brauner wrote:
>
> Hi Christian,
>
>> P1. Isolated id mappings can only be guaranteed to be locally isolated.
>> A container runtime/daemon can only guarantee non-overlapping id mappings
>> when no other users on
"Serge E. Hallyn" writes:
> On Wed, Oct 14, 2020 at 02:46:46PM -0500, Eric W. Biederman wrote:
>> "Serge E. Hallyn" writes:
>>
>> > On Mon, Oct 12, 2020 at 12:01:09AM -0500, Eric W. Biederman wrote:
>> >> Andy Lutomirski writes:
>
"Serge E. Hallyn" writes:
> On Mon, Oct 12, 2020 at 12:01:09AM -0500, Eric W. Biederman wrote:
>> Andy Lutomirski writes:
>>
>> > On Sun, Oct 11, 2020 at 1:53 PM Josh Triplett
>> > wrote:
>> >>
>> >> On Fri, Oct 09, 2020
Andy Lutomirski writes:
> On Sun, Oct 11, 2020 at 1:53 PM Josh Triplett wrote:
>>
>> On Fri, Oct 09, 2020 at 11:26:06PM -0500, Serge E. Hallyn wrote:
>> > > 3. Find a way to allow setgroups() in a user namespace while keeping
>> > >in mind the case of groups used for negative access
ira.we...@intel.com writes:
> From: Ira Weiny
>
> This kmap() call is localized to a single thread. To avoid the over
> head of global PKRS updates use the new kmap_thread() call.
Acked-by: "Eric W. Biederman"
>
> Cc: Eric Biederman
> Signed-off-by: Ira Wein
syzbot writes:
> Hello,
>
> syzbot found the following issue on:
So this is:
static void do_jobctl_trap(void)
{
struct signal_struct *signal = current->signal;
int signr = current->jobctl & JOBCTL_STOP_SIGMASK;
if (current->ptrace & PT_SEIZED) {
if
(See below, didn't snip any comments)
>> > On 09/21/20 at 08:45pm, Eric W. Biederman wrote:
>> > > Konrad Rzeszutek Wilk writes:
>> > >
>> > > > On Fri, Sep 18, 2020 at 05:47:43PM -0700, Andrew Morton wrote:
>> > > >> On Fri, 18 S
Konrad Rzeszutek Wilk writes:
> On Fri, Sep 18, 2020 at 05:47:43PM -0700, Andrew Morton wrote:
>> On Fri, 18 Sep 2020 11:25:46 +0800 Dave Young wrote:
>>
>> > crash_kexec_post_notifiers enables running various panic notifier
>> > before kdump kernel booting. This increases risks of kdump
linmiaohe writes:
> Eric W. Biederman wrote:
>> Miaohe Lin writes:
>>
>>> Use helper function mapping_allow_writable() to atomic_inc
>>> i_mmap_writable.
>>
>>Why?
>>
>
> Because I think it's better to use the wrapper function instead
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