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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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6e259bc5a1
Improve the distribution algorithm of random base address to ensure a uniformity among all suitable addresses. To generate a random value once, and to build a continuous range in which every value is suitable, count all the suitable addresses (referred to as positions) that can be used as a base address. The positions are counted by iterating over the usable memory ranges. For each range that is big enough to accommodate the image, count all the suitable addresses where the image can be placed, while taking reserved memory ranges into consideration. A new function "iterate_valid_positions()" has dual purpose. Firstly, it is called to count the positions in a given memory range, and secondly, to convert a random position back to an address. "get_random_base()" has been replaced with more generic "randomize_within_range()" which now could be called for randomizing base addresses not just for the kernel image. Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BOOT_BOOT_H
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#define BOOT_BOOT_H
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#include <linux/types.h>
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#define IPL_START 0x200
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#ifndef __ASSEMBLY__
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#include <asm/physmem_info.h>
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struct machine_info {
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unsigned char has_edat1 : 1;
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unsigned char has_edat2 : 1;
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unsigned char has_nx : 1;
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};
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struct vmlinux_info {
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unsigned long default_lma;
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unsigned long entry;
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unsigned long image_size; /* does not include .bss */
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unsigned long bss_size; /* uncompressed image .bss size */
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unsigned long bootdata_off;
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unsigned long bootdata_size;
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unsigned long bootdata_preserved_off;
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unsigned long bootdata_preserved_size;
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unsigned long dynsym_start;
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unsigned long rela_dyn_start;
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unsigned long rela_dyn_end;
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unsigned long amode31_size;
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unsigned long init_mm_off;
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unsigned long swapper_pg_dir_off;
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unsigned long invalid_pg_dir_off;
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#ifdef CONFIG_KASAN
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unsigned long kasan_early_shadow_page_off;
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unsigned long kasan_early_shadow_pte_off;
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unsigned long kasan_early_shadow_pmd_off;
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unsigned long kasan_early_shadow_pud_off;
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unsigned long kasan_early_shadow_p4d_off;
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#endif
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};
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void startup_kernel(void);
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unsigned long detect_max_physmem_end(void);
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void detect_physmem_online_ranges(unsigned long max_physmem_end);
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void physmem_set_usable_limit(unsigned long limit);
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void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size);
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void physmem_free(enum reserved_range_type type);
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/* for continuous/multiple allocations per type */
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unsigned long physmem_alloc_top_down(enum reserved_range_type type, unsigned long size,
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unsigned long align);
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/* for single allocations, 1 per type */
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unsigned long physmem_alloc_range(enum reserved_range_type type, unsigned long size,
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unsigned long align, unsigned long min, unsigned long max,
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bool die_on_oom);
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unsigned long get_physmem_alloc_pos(void);
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bool ipl_report_certs_intersects(unsigned long addr, unsigned long size,
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unsigned long *intersection_start);
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bool is_ipl_block_dump(void);
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void store_ipl_parmblock(void);
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int read_ipl_report(void);
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void save_ipl_cert_comp_list(void);
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void setup_boot_command_line(void);
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void parse_boot_command_line(void);
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void verify_facilities(void);
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void print_missing_facilities(void);
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void sclp_early_setup_buffer(void);
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void print_pgm_check_info(void);
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unsigned long randomize_within_range(unsigned long size, unsigned long align,
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unsigned long min, unsigned long max);
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void setup_vmem(unsigned long asce_limit);
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void __printf(1, 2) decompressor_printk(const char *fmt, ...);
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void print_stacktrace(unsigned long sp);
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void error(char *m);
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extern struct machine_info machine;
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/* Symbols defined by linker scripts */
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extern const char kernel_version[];
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extern unsigned long memory_limit;
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extern unsigned long vmalloc_size;
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extern int vmalloc_size_set;
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extern char __boot_data_start[], __boot_data_end[];
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extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
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extern char _decompressor_syms_start[], _decompressor_syms_end[];
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extern char _stack_start[], _stack_end[];
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extern char _end[], _decompressor_end[];
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extern unsigned char _compressed_start[];
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extern unsigned char _compressed_end[];
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extern struct vmlinux_info _vmlinux_info;
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#define vmlinux _vmlinux_info
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#define __abs_lowcore_pa(x) (((unsigned long)(x) - __abs_lowcore) % sizeof(struct lowcore))
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static inline bool intersects(unsigned long addr0, unsigned long size0,
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unsigned long addr1, unsigned long size1)
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{
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return addr0 + size0 > addr1 && addr1 + size1 > addr0;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* BOOT_BOOT_H */
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