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backslashxx 5f871cd713 kernel/selinux: fix pointer mismatch with 32-bit ksud on 64-bit kernels

Since KernelSU Manager can now be built for 32-bit, theres this problematic
setup where userspace is 32-bit (armeabi-v7a) and kernel is 64bit (aarch64).

On 64-bit kernels with CONFIG_COMPAT=y, 32-bit userspace passes 32-bit pointers.
These values are interpreted as 64-bit pointers without proper casting and that
results in invalid or near-null memory access.

This patch adds proper compat-mode handling with the ff changes:
- introduce a dedicated struct (`sepol_compat_data`) using u32 fields
- use `compat_ptr()` to safely convert 32-bit user pointers to kernel pointers
- adding a runtime `ksu_is_compat` flag to dynamically select between struct layouts

This prevents a near-null pointer dereference when handling SELinux
policy updates from 32-bit ksud in a 64-bit kernel.

Truth table:

kernel 32 + ksud 32, struct is u32, no compat_ptr
kernel 64 + ksud 32, struct is u32, yes compat_ptr
kernel 64 + ksud 64, struct is u64, no compat_ptr

Preprocessor check

64BIT=y COMPAT=y: define both structs, select dynamically
64BIT=y COMPAT=n: struct u64
64BIT=n: struct u32

Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>

2025-05-18 03:23:12 +06:00

.github

manager/userspace: added 32bit (armv7a) support

2025-05-18 03:19:50 +06:00

assets

manager: improved app icon

2024-12-25 04:45:46 +06:00

docs

Fixes for Russian translation (#358 )

2025-05-07 02:32:31 +06:00

kernel

kernel/selinux: fix pointer mismatch with 32-bit ksud on 64-bit kernels

2025-05-18 03:23:12 +06:00

manager

manager: refactor working mode designation

2025-05-18 01:56:47 +06:00

scripts

scripts: send ci build to message thread

2025-01-20 15:27:12 +06:00

userspace

manager/userspace: added 32bit (armv7a) support

2025-05-18 03:19:50 +06:00

.gitattributes

Upgrade Gradle and AGP (#1431 )

2024-03-08 10:31:41 +08:00

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manager: refactor to use AGP 8.0.0 (#414 )

2023-04-21 16:19:49 +08:00

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misc: Add just command

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LICENSE

Initial commit

2022-12-09 22:03:55 +08:00

SECURITY.md

Create SECURITY.md

2023-10-09 22:53:21 +08:00

docs/README.md

KernelSU Next

A kernel-based root solution for Android devices.

Features

Kernel-based su and root access management.
Module system based on dynamic mount system Magic Mount / OverlayFS.
App Profile: Lock up the root power in a cage.

Compatibility state

KernelSU Next officially supports most Android kernels starting from 4.4 up to 6.6.

GKI 2.0 (5.10+) kernels can run pre-built images and LKM/KMI.
GKI 1.0 (4.19 - 5.4) kernels need to rebuilt with KernelSU driver.
EOL (<4.14) kernels also need to be rebuilt with KernelSU driver (3.18+ is experimental and may need some function backports).

Currently, only the arm64-v8a architecture is supported.

Usage

Installation instruction

Security

For information on reporting security vulnerabilities in KernelSU, see SECURITY.md.

License

Files under the kernel directory are GPL-2.0-only.
All other parts except the kernel directory are GPL-3.0-or-later.

Donations

0x12b5224b7aca0121c2f003240a901e1d064371c1 [ USDT BEP20 ]
TYUVMWGTcnR5svnDoX85DWHyqUAeyQcdjh [ USDT TRC20 ]
0x12b5224b7aca0121c2f003240a901e1d064371c1 [ USDT ERC20 ]
0x12b5224b7aca0121c2f003240a901e1d064371c1 [ ETH ERC20 ]
Ld238uYBuRQdZB5YwdbkuU6ektBAAUByoL [ LTC ]
19QgifcjMjSr1wB2DJcea5cxitvWVcXMT6 [ BTC ]

Credits

Kernel-Assisted Superuser: The KernelSU idea.
Magisk: The powerful root tool.
genuine: APK v2 signature validation.
Diamorphine: Some rootkit skills.
KernelSU: Thanks to tiann, or else KernelSU Next wouldn't even exist.
Magic Mount Port: 💜 5ec1cff for saving KernelSU!

Releases 1

v1.0.8 Latest

2025-06-16 00:00:17 +00:00

Languages

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Rust 29.4%

C 16.5%

Java 4.4%

Shell 2.9%

Other 2.7%