From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- include/video/kyro.h | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 include/video/kyro.h (limited to 'include/video/kyro.h') diff --git a/include/video/kyro.h b/include/video/kyro.h new file mode 100644 index 000000000..418eef6c5 --- /dev/null +++ b/include/video/kyro.h @@ -0,0 +1,79 @@ +/* + * linux/drivers/video/kyro/kryo.h + * + * Copyright (C) 2002 STMicroelectronics + * Copyright (C) 2004 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#ifndef _KYRO_H +#define _KYRO_H + +struct kyrofb_info { + void __iomem *regbase; + + u32 palette[16]; + u32 HTot; /* Hor Total Time */ + u32 HFP; /* Hor Front Porch */ + u32 HST; /* Hor Sync Time */ + u32 HBP; /* Hor Back Porch */ + s32 HSP; /* Hor Sync Polarity */ + u32 VTot; /* Ver Total Time */ + u32 VFP; /* Ver Front Porch */ + u32 VST; /* Ver Sync Time */ + u32 VBP; /* Ver Back Porch */ + s32 VSP; /* Ver Sync Polarity */ + u32 XRES; /* X Resolution */ + u32 YRES; /* Y Resolution */ + u32 VFREQ; /* Ver Frequency */ + u32 PIXCLK; /* Pixel Clock */ + u32 HCLK; /* Hor Clock */ + + /* Useful to hold depth here for Linux */ + u8 PIXDEPTH; + + int wc_cookie; +}; + +/* + * benedict.gaster@superh.com + * Added the follow IOCTLS for the creation of overlay services... + */ +#define KYRO_IOC_MAGIC 'k' + +#define KYRO_IOCTL_OVERLAY_CREATE _IO(KYRO_IOC_MAGIC, 0) +#define KYRO_IOCTL_OVERLAY_VIEWPORT_SET _IO(KYRO_IOC_MAGIC, 1) +#define KYRO_IOCTL_SET_VIDEO_MODE _IO(KYRO_IOC_MAGIC, 2) +#define KYRO_IOCTL_UVSTRIDE _IO(KYRO_IOC_MAGIC, 3) +#define KYRO_IOCTL_OVERLAY_OFFSET _IO(KYRO_IOC_MAGIC, 4) +#define KYRO_IOCTL_STRIDE _IO(KYRO_IOC_MAGIC, 5) + +/* + * The follow 3 structures are used to pass data from user space into the kernel + * for the creation of overlay surfaces and setting the video mode. + */ +typedef struct _OVERLAY_CREATE { + u32 ulWidth; + u32 ulHeight; + int bLinear; +} overlay_create; + +typedef struct _OVERLAY_VIEWPORT_SET { + u32 xOrgin; + u32 yOrgin; + u32 xSize; + u32 ySize; +} overlay_viewport_set; + +typedef struct _SET_VIDEO_MODE { + u32 ulWidth; + u32 ulHeight; + u32 ulScan; + u8 displayDepth; + int bLinear; +} set_video_mode; + +#endif /* _KYRO_H */ -- cgit v1.3.1