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Filename Latest commit message Latest commit date
Nicolai Stange bf4d02ab1e UPSTREAM: io_uring: Fix current->fs handling in io_sq_wq_submit_work() 
No upstream commit, this is a fix to a stable 5.4 specific backport.

The intention of backport commit cac68d12c5 ("io_uring: grab ->fs as part
of async offload") as found in the stable 5.4 tree was to make
io_sq_wq_submit_work() to switch the workqueue task's ->fs over to the
submitting task's one during the IO operation.

However, due to a small logic error, this change turned out to not have any
actual effect. From a high level, the relevant code in
io_sq_wq_submit_work() looks like

  old_fs_struct = current->fs;
  do {
          ...
          if (req->fs != current->fs && current->fs != old_fs_struct) {
                  task_lock(current);
                  if (req->fs)
                          current->fs = req->fs;
                  else
                          current->fs = old_fs_struct;
                  task_unlock(current);
          }
          ...
  } while (req);

The if condition is supposed to cover the case that current->fs doesn't
match what's needed for processing the request, but observe how it fails
to ever evaluate to true due to the second clause:
current->fs != old_fs_struct will be false in the first iteration as per
the initialization of old_fs_struct and because this prevents current->fs
from getting replaced, the same follows inductively for all subsequent
iterations.

Fix said if condition such that
- if req->fs is set and doesn't match current->fs, the latter will be
  switched to the former
- or if req->fs is unset, the switch back to the initial old_fs_struct
  will be made, if necessary.

While at it, also correct the condition for the ->fs related cleanup right
before the return of io_sq_wq_submit_work(): currently, old_fs_struct is
restored only if it's non-NULL. It is always non-NULL though and thus, the
if-condition is rendundant. Supposedly, the motivation had been to optimize
and avoid switching current->fs back to the initial old_fs_struct in case
it is found to have the desired value already. Make it so.

Cc: stable@vger.kernel.org # v5.4
Fixes: cac68d12c5 ("io_uring: grab ->fs as part of async offload")
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit c4a23c852e)
Bug: 196948385
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Id4e7757ef2beaf58ac578bd9f09184085b3d0f5b
2021-08-17 17:05:36 +00:00
android ANDROID: ABI: Update allowed list for QCOM 2021-08-16 22:04:46 +05:30
arch UPSTREAM: arm64: vdso: Avoid ISB after reading from cntvct_el0 2021-08-12 07:48:24 +00:00
block ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
certs
crypto ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
Documentation ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
drivers UPSTREAM: HID: make arrays usage and value to be the same 2021-05-27 16:33:52 -07:00
fs UPSTREAM: io_uring: Fix current->fs handling in io_sq_wq_submit_work() 2021-08-17 17:05:36 +00:00
include ANDROID: GKI: add padding to struct hid_device 2021-08-05 09:04:13 +02:00
init ANDROID: GKI: Enable DRM_GEM_SHMEM_HELPER 2021-03-20 12:02:49 +00:00
ipc
kernel UPSTREAM: sched/fair: Prefer prev cpu in asymmetric wakeup path 2021-05-03 20:55:31 -07:00
lib This is the 5.4.83 stable release 2020-12-11 15:00:01 +01:00
LICENSES
mm UPSTREAM: mm/cma.c: remove redundant cma_mutex lock 2021-05-06 09:34:26 +00:00
net FROMGIT: bpf: Do not change gso_size during bpf_skb_change_proto() 2021-06-29 00:42:36 +00:00
samples This is the 5.4.86 stable release 2020-12-30 12:31:14 +01:00
scripts ANDROID: generate_initcall_order.pl: Use two dash long options for llvm-nm 2021-07-21 20:41:37 -07:00
security ANDROID: selinux: modify RTM_GETNEIGH{TBL} 2021-06-21 08:31:02 +00:00
sound This is the 5.4.86 stable release 2020-12-30 12:31:14 +01:00
tools ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
usr
virt KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace 2020-12-02 08:49:46 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
build.config.aarch64
build.config.allmodconfig
build.config.allmodconfig.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.allmodconfig.arm ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.allmodconfig.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.arm
build.config.common ANDROID: clang: update to 12.0.5 2021-04-19 19:41:50 +00:00
build.config.db845c ANDROID: db845c: Use FRAGMENT_CONFIG 2021-03-08 19:14:48 +00:00
build.config.gki
build.config.gki-debug.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.gki-debug.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.gki.aarch64 ANDROID: GKI: Add FCNT KMI symbol list 2021-08-10 15:36:50 +00:00
build.config.gki.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.gki_kasan ANDROID: build_config: drop CONFIG_KASAN_PANIC_ON_WARN 2021-02-15 18:29:03 +00:00
build.config.gki_kasan.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.gki_kasan.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.gki_kprobes ANDROID: Adding kprobes build configs for Cuttlefish 2021-02-28 04:50:28 +00:00
build.config.gki_kprobes.aarch64 ANDROID: Adding kprobes build configs for Cuttlefish 2021-02-28 04:50:28 +00:00
build.config.gki_kprobes.x86_64 ANDROID: Adding kprobes build configs for Cuttlefish 2021-02-28 04:50:28 +00:00
build.config.hikey960 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 14:50:31 +08:00
build.config.x86_64
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS UPSTREAM: HID: playstation: initial DualSense USB support. 2021-03-12 17:11:35 -08:00
Makefile This is the 5.4.86 stable release 2020-12-30 12:31:14 +01:00
OWNERS ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
README
README.md

README.md

How do I submit patches to Android Common Kernels

  1. BEST: Make all of your changes to upstream Linux. If appropriate, backport to the stable releases. These patches will be merged automatically in the corresponding common kernels. If the patch is already in upstream Linux, post a backport of the patch that conforms to the patch requirements below.

  2. LESS GOOD: Develop your patches out-of-tree (from an upstream Linux point-of-view). Unless these are fixing an Android-specific bug, these are very unlikely to be accepted unless they have been coordinated with kernel-team@android.com. If you want to proceed, post a patch that conforms to the patch requirements below.

Common Kernel patch requirements

  • All patches must conform to the Linux kernel coding standards and pass script/checkpatch.pl
  • Patches shall not break gki_defconfig or allmodconfig builds for arm, arm64, x86, x86_64 architectures (see https://source.android.com/setup/build/building-kernels)
  • If the patch is not merged from an upstream branch, the subject must be tagged with the type of patch: UPSTREAM:, BACKPORT:, FROMGIT:, FROMLIST:, or ANDROID:.
  • All patches must have a Change-Id: tag (see https://gerrit-review.googlesource.com/Documentation/user-changeid.html)
  • If an Android bug has been assigned, there must be a Bug: tag.
  • All patches must have a Signed-off-by: tag by the author and the submitter

Additional requirements are listed below based on patch type

Requirements for backports from mainline Linux: UPSTREAM:, BACKPORT:

  • If the patch is a cherry-pick from Linux mainline with no changes at all
    • tag the patch subject with UPSTREAM:.
    • add upstream commit information with a (cherry-picked from ...) line
    • Example:
      • if the upstream commit message is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        UPSTREAM: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch requires any changes from the upstream version, tag the patch with BACKPORT: instead of UPSTREAM:.
    • use the same tags as UPSTREAM:
    • add comments about the changes under the (cherry-picked from ...) line
    • Example:
        BACKPORT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        [ Resolved minor conflict in drivers/foo/bar.c ]
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for other backports: FROMGIT:, FROMLIST:,

  • If the patch has been merged into an upstream maintainer tree, but has not yet been merged into Linux mainline
    • tag the patch subject with FROMGIT:
    • add info on where the patch came from as (cherry picked from commit <sha1> <repo> <branch>). This must be a stable maintainer branch (not rebased, so don't use linux-next for example).
    • if changes were required, use BACKPORT: FROMGIT:
    • Example:
      • if the commit message in the maintainer tree is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        FROMGIT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        (cherry picked from commit 878a2fd9de10b03d11d2f622250285c7e63deace
         https://git.kernel.org/pub/scm/linux/kernel/git/foo/bar.git test-branch)
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch has been submitted to LKML, but not accepted into any maintainer tree
    • tag the patch subject with FROMLIST:
    • add a Link: tag with a link to the submittal on lore.kernel.org
    • if changes were required, use BACKPORT: FROMLIST:
    • Example:
        FROMLIST: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Link: https://lore.kernel.org/lkml/20190619171517.GA17557@someone.com/
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for Android-specific patches: ANDROID:

  • If the patch is fixing a bug to Android-specific code
    • tag the patch subject with ANDROID:
    • add a Fixes: tag that cites the patch with the bug
    • Example:
        ANDROID: fix android-specific bug in foobar.c

        This is the detailed description of the important fix

        Fixes: 1234abcd2468 ("foobar: add cool feature")
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch is a new feature
    • tag the patch subject with ANDROID:
    • add a Bug: tag with the Android bug (required for android-specific features)