3DBF168CF8EB5E4CBA366B4 *l4( (  fB- /_I|+/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef _LINUX_RANDOMIZE_KSTACK_H #define _LINUX_RANDOMIZE_KSTACK_H #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET #include #include #include DECLARE_STATIC_KEY_MAYBE(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, randomize_kstack_offset); DECLARE_PER_CPU(u32, kstack_offset); /* * Do not use this anywhere else in the kernel. This is used here because * it provides an arch-agnostic way to grow the stack with correct * alignment. Also, since this use is being explicitly masked to a max of * 10 bits, stack-clash style attacks are unlikely. For more details see * "VLAs" in Documentation/process/deprecated.rst */ void *__builtin_alloca(size_t size); /* * Use, at most, 10 bits of entropy. We explicitly cap this to keep the * "VLA" from being unbounded (see above). 10 bits leaves enough room for * per-arch offset masks to reduce entropy (by removing higher bits, since * high entropy may overly constrain usable stack space), and for * compiler/arch-specific stack alignment to remove the lower bits. */ #define KSTACK_OFFSET_MAX(x) ((x) & 0x3FF) /* * These macros must be used during syscall entry when interrupts and * preempt are disabled, and after user registers have been stored to * the stack. */ #define add_random_kstack_offset() do { \ if (static_branch_maybe(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, \ &randomize_kstack_offset)) { \ u32 offset = raw_cpu_read(kstack_offset); \ u8 *ptr = __builtin_alloca(KSTACK_OFFSET_MAX(offset)); \ /* Keep allocation even after "ptr" loses scope. */ \ asm volatile("" :: "r"(ptr) : "memory"); \ } \ } while (0) #define choose_random_kstack_offset(rand) do { \ if (static_branch_maybe(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, \ &randomize_kstack_offset)) { \ u32 offset = raw_cpu_read(kstack_offset); \ offset = ror32(offset, 5) ^ (rand); \ raw_cpu_write(kstack_offset, offset); \ } \ } while (0) #else /* CONFIG_RANDOMIZE_KSTACK_OFFSET */ #define add_random_kstack_offset() do { } while (0) #define choose_random_kstack_offset(rand) do { } while (0) #endif /* CONFIG_RANDOMIZE_KSTACK_OFFSET */ #endif   wI /* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2022 HiSilicon Limited. */ #ifndef _KERNEL_DMA_BENCHMARK_H #define _KERNEL_DMA_BENCHMARK_H #define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark) #define DMA_MAP_MAX_THREADS 1024 #define DMA_MAP_MAX_SECONDS 300 #define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC) #define DMA_MAP_BIDIRECTIONAL 0 #define DMA_MAP_TO_DEVICE 1 #define DMA_MAP_FROM_DEVICE 2 struct map_benchmark { __u64 avg_map_100ns; /* average map latency in 100ns */ __u64 map_stddev; /* standard deviation of map latency */ __u64 avg_unmap_100ns; /* as above */ __u64 unmap_stddev; __u32 threads; /* how many threads will do map/unmap in parallel */ __u32 seconds; /* how long the test will last */ __s32 node; /* which numa node this benchmark will run on */ __u32 dma_bits; /* DMA addressing capability */ __u32 dma_dir; /* DMA data direction */ __u32 dma_trans_ns; /* time for DMA transmission in ns */ __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */ }; #endif /* _KERNEL_DMA_BENCHMARK_H */   File not found. " lm_J*j"TfAqTţ h 1 lm_J 2BP,1h 0File not found.  743_I|Mdv &K Index of /FSS-OZR/root/sys/module/binfmt_misc/notes

Index of /FSS-OZR/root/sys/module/binfmt_misc/notes

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