Linaro-mm-sig

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2 participants
7053 discussions

[PATCH v3 0/2] libfs: set SB_I_NOEXEC and SB_I_NODEV in init_pseudo()

by John Hubbard

This began as a one-line dma-buf fix for a path_noexec() warning added by commit 1e7ab6f67824 ("anon_inode: rework assertions"). Christoph pointed out that the fix belongs higher up: a pseudo filesystem has no reason not to set SB_I_NOEXEC by default. This series does that. * Patch 1 sets both flags in init_pseudo(), so every pseudo filesystem gets them. This is the only patch that changes a flag, and the only one with Fixes:/Cc: stable. * Patch 2 drops the assignments that are now redundant in the callers that set them by hand. Most callers already set one or both flags. I audited every init_pseudo() caller. Here is what patch 1 actually changes for each. The only visible effect is on dma-buf, where SB_I_NOEXEC silences the warning. SB_I_NODEV is never consulted on these SB_NOUSER mounts, and none of the callers that gain SB_I_NOEXEC are executed from. caller had patch 1 adds --------------------------- -------- -------------- fs/anon_inodes.c both nothing new mm/secretmem.c both nothing new virt/kvm/guest_memfd.c both nothing new fs/nsfs.c both nothing new fs/pidfs.c both nothing new fs/aio.c NOEXEC NODEV drivers/dma-buf/dma-buf.c neither NOEXEC + NODEV net/socket.c neither NOEXEC + NODEV fs/pipe.c neither NOEXEC + NODEV kernel/resource.c neither NOEXEC + NODEV fs/erofs/super.c neither NOEXEC + NODEV fs/btrfs/tests/... neither NOEXEC + NODEV drivers/vfio/vfio_main.c neither NOEXEC + NODEV drivers/gpu/drm/drm_drv.c neither NOEXEC + NODEV drivers/dax/super.c neither NOEXEC + NODEV block/bdev.c neither NOEXEC + NODEV John Hubbard (2): libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo() libfs: drop redundant SB_I_NOEXEC/SB_I_NODEV in init_pseudo() callers fs/aio.c | 1 - fs/anon_inodes.c | 2 -- fs/libfs.c | 1 + fs/nsfs.c | 1 - fs/pidfs.c | 2 -- mm/secretmem.c | 2 -- virt/kvm/guest_memfd.c | 2 -- 7 files changed, 1 insertion(+), 10 deletions(-) base-commit: ba3e43a9e601636f5edb54e259a74f96ca3b8fd8 -- 2.54.0

3 weeks, 1 day

Escape Road 2: Fast Lane Escape

by lilysmith10098＠gmail.com

Escape Road 2 challenges players to stay one step ahead in a world where every corner could lead to freedom or failure. Busy streets, unpredictable traffic, and constant pursuit create an exciting environment that rewards skillful driving. Players must make rapid decisions while navigating through increasingly difficult situations. The sense of momentum grows throughout each run, making survival both challenging and satisfying. Smooth vehicle handling enhances the experience, allowing daring maneuvers and creative escapes. Escape Road 2 offers a compelling mix of action and excitement that keeps players returning for another chance to extend their journey. Play game at https://escaperoad2.io

3 weeks, 1 day

Unlocking the Melody: A Guide to Heardle

by many.unicorn.syms＠hidingmail.net

Ever found yourself humming along to a tune, only to realize you can’t quite place the artist or title? If so, you’re in for a treat with Heardle. This delightful online game offers a daily dose of musical trivia, challenging your ear and memory in a surprisingly addictive way. Whether you're a seasoned music aficionado or just looking for a fun brain-teaser, Heardle provides an engaging experience. https://heardlefree.com/ What is Heardle? At its core, Heardle is a daily musical guessing game. Each day, a new song is presented, and your task is to identify it based on short audio snippets. The beauty of Heardle lies in its progressive difficulty. You start with just a second of the intro, and if you’re stumped, you can get more time, up to a maximum of 16 seconds. It's a fantastic way to discover new music or reconnect with old favorites. You can experience the game and try your hand at guessing the daily song by visiting Heardle. Gameplay: Your Daily Musical Challenge Playing Heardle is straightforward and intuitive. When you first open the game, you'll see a simple interface with a play button and a search bar. Listen to the Snippet: Click the play button to hear the initial one-second snippet of the song. Make Your Guess (or Skip): Based on this tiny fragment, you can either type your guess into the search bar. As you type, the game will suggest potential song titles and artists. If you have no idea, or want more time, you can click "Skip" to hear a longer segment. Progressive Reveals: Each time you skip, the audio snippet gets slightly longer, giving you more musical clues. You have a total of six attempts. The Reveal: If you guess correctly, or if you exhaust all your attempts, the song's title and artist are revealed. You'll also see your score (how many attempts it took you) and have the option to share your result. Tips for Mastering Heardle While luck plays a small part, there are strategies to improve your Heardle success rate: Focus on Intros: Many songs have very distinctive introductions. Pay close attention to unique instrumentals, vocal hooks, or production styles in the initial seconds. Genre Awareness: If you have a general idea of the era or genre, it can significantly narrow down your search. Sometimes just knowing it's a 90s pop song or a classic rock anthem is enough to trigger a memory. Don't Be Afraid to Skip: There's no penalty for skipping! If the first second doesn't ring a bell, don't waste time pondering. Get those extra seconds of audio. Hum It Out: Sometimes, humming the tune in your head can help you connect it to lyrics or a title you know. Listen Actively: Instead of just hearing, actively listen for specific instruments, vocal inflections, or rhythmic patterns. Explore Past Heardles: While not directly helping with the current day's song, revisiting past Heardle puzzles can help you train your ear and recognize common song structures. You can often find archives of past games on sites like Heardle. Conclusion Heardle offers a delightful and accessible way to engage with music. It's a perfect brief escape for your coffee break, a fun challenge to share with friends, or simply a way to test your musical knowledge. Give it a try, and you might just surprise yourself with how many melodies you recognize – and perhaps discover a new favorite along the way!

3 weeks, 1 day

Embrace the Chaos: A Beginner's Guide to the Joy of Basket Random

by unable.rhinoceros.micz＠hidingmail.net

If you are tired of ultra-realistic sports simulators that require complex button combinations and intense strategic planning, it is time to embrace the chaos. Enter the world of physics-based ragdoll games, where the only rule is that there are no rules. At the absolute peak of this hilariously unpredictable genre is Basket Random, a two-button browser game that turns the structured sport of basketball into a chaotic, laughter-inducing spectacle. https://basketrandomgame.com/ Whether you want to kill a few minutes during a study break or challenge a friend to a local duel, here is your ultimate guide to experiencing this delightfully absurd game. What is Basket Random? At its core, the game is a 2v2 basketball match, but with a major twist: your players move like floppy, inflatable tube men. Developed with bouncy ragdoll physics, every round presents a completely randomized setup. One round you might be playing with giant heads on a snowy court with a heavy bowling ball; the next, you are on a sunny beach holding a tiny tennis ball with shortened arms. The objective is simple: be the first to score 5 points. However, achieving that objective is a beautifully chaotic journey of trial, error, and luck. How to Play: One-Button Mastery The beauty of the game lies in its minimalist control scheme. You do not need to worry about passing, sprinting, or shooting buttons. You only need one key: Player 1 (or Single Player): Press the W key (or Up Arrow). Player 2: Press the Up Arrow key. When you tap the key, both of your players will jump and tilt in the direction of the ball. If you hold the key, they will swing their arms and legs wildly. Releasing the key at the right moment allows your player to throw the ball toward the hoop. It sounds simple, but because the physics change with every single point scored, you must constantly adapt your timing to the new weight of the ball, the bounce of the court, and the length of your players' limbs. Tips to Dominate the Chaotic Court While the game relies heavily on accidental moments of brilliance, you can actually develop a loose strategy to win more matches: Master the "Spam" vs. "Hold" Balance: Do not just mash the jump button blindly. If the ball is loose, rapid tapping can help you scramble toward it. However, if your player has possession, hold the button to lean backward, then release it at the peak of your jump for a cleaner arc toward the hoop. Play Defense First: Sometimes, the best offense is a solid block. Position your tallest player under the opponent's hoop to swat away their chaotic shots. Use the Environment: Take note of the court changes. On icy courts, your players will slide much further, which can be used to slide-tackle the ball away from opponents. Conclusion Ultimately, the best way to experience Basket Random is with a friend sitting right next to you. The game’s charm lies in its ability to level the playing field; a seasoned gaming pro can easily lose to a beginner who happened to get a lucky bounce off a player's head. It is a game designed not for sweat and competition, but for shared laughter and high-fives. So, open up your browser, grab a friend, and prepare for some of the most hilarious basketball matches you will ever play.

3 weeks, 1 day

[PATCH] iommufd: take dma_resv lock before dma_buf_unpin() in release path

by Ankit Soni

dma_buf_unpin() requires the caller to hold the exporter's dma_resv lock: void dma_buf_unpin(struct dma_buf_attachment *attach) { ... dma_resv_assert_held(dmabuf->resv); ... } iopt_release_pages() calls dma_buf_unpin() without taking that lock, so every iommufd_ioas_destroy()/iommufd_ioas_unmap() that releases the last reference on a DMABUF-backed iopt_pages triggers a WARN. This was hit while running tools/testing/selftests/iommu/iommufd: WARNING: drivers/dma-buf/dma-buf.c:1137 at dma_buf_unpin+0x62/0x70 RIP: 0010:dma_buf_unpin+0x62/0x70 Call Trace: <TASK> dma_buf_unpin+0x62/0x70 iopt_release_pages+0xe4/0x190 iopt_unmap_iova_range+0x1c7/0x290 iopt_unmap_all+0x1a/0x30 iommufd_ioas_destroy+0x1d/0x50 iommufd_fops_release+0x93/0x150 __fput+0xfc/0x2c0 __x64_sys_close+0x3d/0x80 do_syscall_64+0x65/0x180 </TASK> Take the dma_resv lock around dma_buf_unpin() in iopt_release_pages(), matching the iopt_map_dmabuf() convention. dma_buf_detach() acquires the reservation lock internally, so it must remain outside the locked region. Fixes: 8c5f9645c389 ("iommufd: Add dma_buf_pin()") Reported-by: Ankit Soni <Ankit.Soni(a)amd.com> Signed-off-by: Ankit Soni <Ankit.Soni(a)amd.com> --- drivers/iommu/iommufd/pages.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c index 9bdb2945afe1..7b64002e54b9 100644 --- a/drivers/iommu/iommufd/pages.c +++ b/drivers/iommu/iommufd/pages.c @@ -1663,7 +1663,9 @@ void iopt_release_pages(struct kref *kref) if (iopt_is_dmabuf(pages) && pages->dmabuf.attach) { struct dma_buf *dmabuf = pages->dmabuf.attach->dmabuf; + dma_resv_lock(dmabuf->resv, NULL); dma_buf_unpin(pages->dmabuf.attach); + dma_resv_unlock(dmabuf->resv); dma_buf_detach(dmabuf, pages->dmabuf.attach); dma_buf_put(dmabuf); WARN_ON(!list_empty(&pages->dmabuf.tracker)); -- 2.43.0

3 weeks, 1 day

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by jamestoah113＠gmail.com

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3 weeks, 1 day

[PATCH v2] accel/rocket: Fix fence leak, runtime PM leak and WARN in rocket_job_run() error paths

by zhaojinming＠uniontech.com

The content of this message was lost. It was probably cross-posted to multiple lists and previously handled on another list.

3 weeks, 2 days

[PATCH] accel/rocket: Fix dma_fence reference leak on error paths in rocket_job_run()

by ZhaoJinming

In rocket_job_run(), after creating a fence at line 305 and taking an extra reference for job->done_fence at line 311 via dma_fence_get(), two error paths fail to release that extra reference before returning: - Line 314: When pm_runtime_get_sync() fails, returns fence without putting job->done_fence. - Line 318: When iommu_attach_group() fails, returns fence without putting job->done_fence, and also omits pm_runtime_put() to balance the successful pm_runtime_get_sync() at line 313. The leaked fence reference prevents the fence and its underlying rocket device from being freed while job->done_fence still points to it. Repeated failures will accumulate leaked fences, consuming kernel memory and holding device resources indefinitely. Fix both error paths by calling dma_fence_put(job->done_fence) and setting job->done_fence to NULL before returning. Also add the missing pm_runtime_put() on the iommu_attach_group error path. Cc: stable(a)vger.kernel.org Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL") Signed-off-by: ZhaoJinming <zhaojinming(a)uniontech.com> --- drivers/accel/rocket/rocket_job.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c index ac51bff39833..66e4a1d57842 100644 --- a/drivers/accel/rocket/rocket_job.c +++ b/drivers/accel/rocket/rocket_job.c @@ -311,12 +311,19 @@ static struct dma_fence *rocket_job_run(struct drm_sched_job *sched_job) job->done_fence = dma_fence_get(fence); ret = pm_runtime_get_sync(core->dev); - if (ret < 0) + if (ret < 0) { + dma_fence_put(job->done_fence); + job->done_fence = NULL; return fence; + } ret = iommu_attach_group(job->domain->domain, core->iommu_group); - if (ret < 0) + if (ret < 0) { + pm_runtime_put(core->dev); + dma_fence_put(job->done_fence); + job->done_fence = NULL; return fence; + } scoped_guard(mutex, &core->job_lock) { core->in_flight_job = job; -- 2.20.1

3 weeks, 2 days

[PATCH v18 0/4] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/164580/ Branch with patches applied available here: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem This patch series applies on top of drm-rust-next Patch-series wide changes since V15: * Fix some major rebasing errors I somehow didn't notice :( * Drop the dependency on LazyInit, use the trick that Alice suggested instead. * Fix dependency ordering so that Tyr can get the vmap stuff first without the other bits. Patch-series wide changes since V16: * Fix ordering one more time (SetOnce::reset() doesn't need to come before adding vmap functions) * Rebase against the latest DeviceContext changes from me that got pushed. Lyude Paul (4): rust: drm: gem: shmem: Add DmaResvGuard helper rust: drm: gem: shmem: Add vmap functions rust: faux: Allow retrieving a bound Device rust: drm: gem: Introduce shmem::Object::sg_table() rust/kernel/drm/gem/shmem.rs | 511 ++++++++++++++++++++++++++++++++++- rust/kernel/faux.rs | 16 +- 2 files changed, 512 insertions(+), 15 deletions(-) base-commit: fea3a2dd7d3fc1936211ced5f84420e610435730 -- 2.54.0

3 weeks, 2 days

[PATCH 0/4] rust / dma_buf: Add abstractions for dma_fence

by Philipp Stanner

Changes since the RFC: - Include support for ForeignOwnable for ARef, so that a Fence can be stuffed into an XArray et al. (Code by Danilo) - Implement ForeignOwnable (with new borrow type) for DriverFence, so that it can be stuffed into an XArray. - Include the rcu::RcuBox data type to defer dropping data with RCU (Cody by Alice) - Port DmaFence to RcuBox to make UAF bugs through later, new dma_fence callbacks (backend_ops) impossible. - Force users to pass their fence data in an RcuBox (or have it not need drop()) through a Sealed trait. - Document the rules for the user's DriverFence::data's drop implementation very clearly (deadlock danger). - rustfmt, Clippy. - Various style suggestions, safety comments, etc. (Önur) - Add __rust_helper prefix to helper functions. (Önur) Changes in RFC v3: - Omit JobQueue patches for now - Completely redesign the memory layout: Instead of a Fence refcounting a DriverFence, both now live in the same allocation to allow for future support the dma_fence backend_ops callbacks which need to do container_of. (mostly Boris's feedback) - Allow for pre-allocating fences to avoid deadlocks when submitting jobs to a GPU. (Boris) - Simultaneously, allow for pre-preparing fence callback objects, so the driver can allocate them when it sees fit. (code largely stolen and inspired by Daniel). - Signal fences on drop, ensure synchronization. - Force users to set an error code when signalling. - Write more documentation - A ton of minor other changes. Alright, so since the last RFCs did not reveal significant design issues, I decided to transition this series to a v1 and hope that we can get it upstream. This now includes code for more common infrastructure that dma_fence needs, contributed by Danilo and Alice. --- Old cover letter for RFC: So, this is the spiritual successor of the first / second RFC [1]. v2 also contained code for drm::JobQueue, but mostly to show how the fence code would be used. JobQueue is under heavy rework right now, so I don't want to bother your eyes with it. The docstring examples should show how Rust fences are supposed to be used, though. This v3 contains a huge amount of highly valuable feedback from a variety of people, notably Boris, but also from Alice, Gary and Danilo. There are some TODOs open (a better trait for fence backend_ops and RCU support), but my hope is that this effort is now finally approaching its end. I would greatly appreciate feedback and especially more information about what might be missing to make this usable, which is obviously where Daniel's and Boris's feedback will be valuable once more. Please regard this patch just as what it's titled: an RFC, to discuss a bit more and to inform a broader community about what the current state is and where this is heading at. Many regards, Philipp [1] https://lore.kernel.org/rust-for-linux/20260203081403.68733-2-phasta@kernel… Alice Ryhl (1): rust: rcu: add RcuBox type Danilo Krummrich (1): rust: types: implement ForeignOwnable for ARef<T> Philipp Stanner (2): rust: Add dma_fence abstractions MAINTAINERS: Add entry for Rust dma-buf MAINTAINERS | 2 + rust/bindings/bindings_helper.h | 2 + rust/helpers/dma_fence.c | 48 ++ rust/helpers/helpers.c | 1 + rust/kernel/dma_buf/dma_fence.rs | 821 +++++++++++++++++++++++++++++++ rust/kernel/dma_buf/mod.rs | 13 + rust/kernel/lib.rs | 1 + rust/kernel/sync/aref.rs | 39 ++ rust/kernel/sync/rcu.rs | 31 +- rust/kernel/sync/rcu/rcu_box.rs | 145 ++++++ 10 files changed, 1102 insertions(+), 1 deletion(-) create mode 100644 rust/helpers/dma_fence.c create mode 100644 rust/kernel/dma_buf/dma_fence.rs create mode 100644 rust/kernel/dma_buf/mod.rs create mode 100644 rust/kernel/sync/rcu/rcu_box.rs -- 2.54.0

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