mirror of https://gitee.com/openkylin/linux.git
Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 boot updates from Ingo Molnar: "The main changes in this cycle were KASLR improvements for rare environments with special boot options, by Baoquan He. Also misc smaller changes/cleanups" * 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/debug: Extend the lower bound of crash kernel low reservations x86/boot: Remove unused copy_*_gs() functions x86/KASLR: Use the right memcpy() implementation Documentation/kernel-parameters.txt: Update 'memmap=' boot option description x86/KASLR: Handle the memory limit specified by the 'memmap=' and 'mem=' boot options x86/KASLR: Parse all 'memmap=' boot option entries
This commit is contained in:
Linus Torvalds
commit
25e09ca524
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@ -2136,6 +2136,12 @@
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memmap=nn[KMG]@ss[KMG]
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[KNL] Force usage of a specific region of memory.
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Region of memory to be used is from ss to ss+nn.
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If @ss[KMG] is omitted, it is equivalent to mem=nn[KMG],
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which limits max address to nn[KMG].
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Multiple different regions can be specified,
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comma delimited.
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Example:
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memmap=100M@2G,100M#3G,1G!1024G
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memmap=nn[KMG]#ss[KMG]
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[KNL,ACPI] Mark specific memory as ACPI data.
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@ -2148,6 +2154,9 @@
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memmap=64K$0x18690000
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or
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memmap=0x10000$0x18690000
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Some bootloaders may need an escape character before '$',
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like Grub2, otherwise '$' and the following number
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will be eaten.
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memmap=nn[KMG]!ss[KMG]
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[KNL,X86] Mark specific memory as protected.
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@ -13,7 +13,7 @@ static inline char rdfs8(addr_t addr)
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return *((char *)(fs + addr));
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}
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#include "../cmdline.c"
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static unsigned long get_cmd_line_ptr(void)
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unsigned long get_cmd_line_ptr(void)
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{
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unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
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@ -9,16 +9,42 @@
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* contain the entire properly aligned running kernel image.
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*
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*/
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/*
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* isspace() in linux/ctype.h is expected by next_args() to filter
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* out "space/lf/tab". While boot/ctype.h conflicts with linux/ctype.h,
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* since isdigit() is implemented in both of them. Hence disable it
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* here.
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*/
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#define BOOT_CTYPE_H
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/*
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* _ctype[] in lib/ctype.c is needed by isspace() of linux/ctype.h.
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* While both lib/ctype.c and lib/cmdline.c will bring EXPORT_SYMBOL
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* which is meaningless and will cause compiling error in some cases.
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* So do not include linux/export.h and define EXPORT_SYMBOL(sym)
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* as empty.
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*/
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#define _LINUX_EXPORT_H
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#define EXPORT_SYMBOL(sym)
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#include "misc.h"
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#include "error.h"
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#include "../boot.h"
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#include "../string.h"
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#include <generated/compile.h>
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#include <linux/module.h>
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#include <linux/uts.h>
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#include <linux/utsname.h>
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#include <linux/ctype.h>
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#include <generated/utsrelease.h>
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/* Macros used by the included decompressor code below. */
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#define STATIC
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#include <linux/decompress/mm.h>
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extern unsigned long get_cmd_line_ptr(void);
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/* Simplified build-specific string for starting entropy. */
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static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
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LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
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@ -62,6 +88,11 @@ struct mem_vector {
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static bool memmap_too_large;
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/* Store memory limit specified by "mem=nn[KMG]" or "memmap=nn[KMG]" */
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unsigned long long mem_limit = ULLONG_MAX;
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enum mem_avoid_index {
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MEM_AVOID_ZO_RANGE = 0,
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MEM_AVOID_INITRD,
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@ -85,49 +116,14 @@ static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
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return true;
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}
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/**
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* _memparse - Parse a string with mem suffixes into a number
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* @ptr: Where parse begins
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* @retptr: (output) Optional pointer to next char after parse completes
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*
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* Parses a string into a number. The number stored at @ptr is
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* potentially suffixed with K, M, G, T, P, E.
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*/
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static unsigned long long _memparse(const char *ptr, char **retptr)
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char *skip_spaces(const char *str)
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{
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char *endptr; /* Local pointer to end of parsed string */
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unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
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switch (*endptr) {
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case 'E':
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case 'e':
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ret <<= 10;
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case 'P':
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case 'p':
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ret <<= 10;
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case 'T':
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case 't':
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ret <<= 10;
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case 'G':
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case 'g':
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ret <<= 10;
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case 'M':
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case 'm':
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ret <<= 10;
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case 'K':
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case 'k':
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ret <<= 10;
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endptr++;
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default:
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break;
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}
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if (retptr)
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*retptr = endptr;
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return ret;
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while (isspace(*str))
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++str;
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return (char *)str;
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}
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#include "../../../../lib/ctype.c"
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#include "../../../../lib/cmdline.c"
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static int
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parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
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@ -142,40 +138,41 @@ parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
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return -EINVAL;
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oldp = p;
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*size = _memparse(p, &p);
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*size = memparse(p, &p);
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if (p == oldp)
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return -EINVAL;
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switch (*p) {
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case '@':
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/* Skip this region, usable */
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*start = 0;
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*size = 0;
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return 0;
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case '#':
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case '$':
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case '!':
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*start = _memparse(p + 1, &p);
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*start = memparse(p + 1, &p);
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return 0;
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case '@':
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/* memmap=nn@ss specifies usable region, should be skipped */
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*size = 0;
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/* Fall through */
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default:
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/*
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* If w/o offset, only size specified, memmap=nn[KMG] has the
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* same behaviour as mem=nn[KMG]. It limits the max address
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* system can use. Region above the limit should be avoided.
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*/
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*start = 0;
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return 0;
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}
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return -EINVAL;
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}
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static void mem_avoid_memmap(void)
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static void mem_avoid_memmap(char *str)
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{
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char arg[128];
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static int i;
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int rc;
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int i;
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char *str;
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/* See if we have any memmap areas */
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rc = cmdline_find_option("memmap", arg, sizeof(arg));
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if (rc <= 0)
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if (i >= MAX_MEMMAP_REGIONS)
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return;
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i = 0;
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str = arg;
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while (str && (i < MAX_MEMMAP_REGIONS)) {
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int rc;
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unsigned long long start, size;
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@ -188,9 +185,14 @@ static void mem_avoid_memmap(void)
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if (rc < 0)
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break;
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str = k;
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/* A usable region that should not be skipped */
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if (size == 0)
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if (start == 0) {
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/* Store the specified memory limit if size > 0 */
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if (size > 0)
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mem_limit = size;
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continue;
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}
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mem_avoid[MEM_AVOID_MEMMAP_BEGIN + i].start = start;
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mem_avoid[MEM_AVOID_MEMMAP_BEGIN + i].size = size;
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@ -202,6 +204,57 @@ static void mem_avoid_memmap(void)
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memmap_too_large = true;
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}
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static int handle_mem_memmap(void)
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{
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char *args = (char *)get_cmd_line_ptr();
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size_t len = strlen((char *)args);
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char *tmp_cmdline;
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char *param, *val;
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u64 mem_size;
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if (!strstr(args, "memmap=") && !strstr(args, "mem="))
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return 0;
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tmp_cmdline = malloc(len + 1);
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if (!tmp_cmdline )
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error("Failed to allocate space for tmp_cmdline");
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memcpy(tmp_cmdline, args, len);
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tmp_cmdline[len] = 0;
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args = tmp_cmdline;
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/* Chew leading spaces */
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args = skip_spaces(args);
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while (*args) {
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args = next_arg(args, ¶m, &val);
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/* Stop at -- */
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if (!val && strcmp(param, "--") == 0) {
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warn("Only '--' specified in cmdline");
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free(tmp_cmdline);
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return -1;
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}
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if (!strcmp(param, "memmap")) {
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mem_avoid_memmap(val);
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} else if (!strcmp(param, "mem")) {
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char *p = val;
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if (!strcmp(p, "nopentium"))
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continue;
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mem_size = memparse(p, &p);
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if (mem_size == 0) {
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free(tmp_cmdline);
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return -EINVAL;
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}
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mem_limit = mem_size;
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}
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}
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free(tmp_cmdline);
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return 0;
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}
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/*
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* In theory, KASLR can put the kernel anywhere in the range of [16M, 64T).
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* The mem_avoid array is used to store the ranges that need to be avoided
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/* We don't need to set a mapping for setup_data. */
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/* Mark the memmap regions we need to avoid */
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mem_avoid_memmap();
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handle_mem_memmap();
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#ifdef CONFIG_X86_VERBOSE_BOOTUP
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/* Make sure video RAM can be used. */
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@ -432,7 +485,8 @@ static void process_e820_entry(struct boot_e820_entry *entry,
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{
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struct mem_vector region, overlap;
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struct slot_area slot_area;
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unsigned long start_orig;
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unsigned long start_orig, end;
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struct boot_e820_entry cur_entry;
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/* Skip non-RAM entries. */
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if (entry->type != E820_TYPE_RAM)
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@ -446,8 +500,15 @@ static void process_e820_entry(struct boot_e820_entry *entry,
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if (entry->addr + entry->size < minimum)
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return;
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region.start = entry->addr;
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region.size = entry->size;
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/* Ignore entries above memory limit */
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end = min(entry->size + entry->addr, mem_limit);
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if (entry->addr >= end)
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return;
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cur_entry.addr = entry->addr;
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cur_entry.size = end - entry->addr;
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region.start = cur_entry.addr;
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region.size = cur_entry.size;
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/* Give up if slot area array is full. */
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while (slot_area_index < MAX_SLOT_AREA) {
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@ -461,7 +522,7 @@ static void process_e820_entry(struct boot_e820_entry *entry,
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region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
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/* Did we raise the address above this e820 region? */
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if (region.start > entry->addr + entry->size)
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if (region.start > cur_entry.addr + cur_entry.size)
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return;
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/* Reduce size by any delta from the original address. */
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@ -65,23 +65,3 @@ GLOBAL(copy_to_fs)
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popw %es
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retl
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ENDPROC(copy_to_fs)
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#if 0 /* Not currently used, but can be enabled as needed */
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GLOBAL(copy_from_gs)
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pushw %ds
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pushw %gs
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popw %ds
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calll memcpy
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popw %ds
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retl
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ENDPROC(copy_from_gs)
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GLOBAL(copy_to_gs)
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pushw %es
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pushw %gs
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popw %es
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calll memcpy
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popw %es
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retl
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ENDPROC(copy_to_gs)
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#endif
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@ -122,6 +122,14 @@ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int bas
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return result;
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}
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long simple_strtol(const char *cp, char **endp, unsigned int base)
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{
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if (*cp == '-')
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return -simple_strtoull(cp + 1, endp, base);
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return simple_strtoull(cp, endp, base);
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}
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/**
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* strlen - Find the length of a string
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* @s: The string to be sized
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@ -503,7 +503,7 @@ static int __init reserve_crashkernel_low(void)
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return 0;
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}
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low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
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low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
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if (!low_base) {
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pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
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(unsigned long)(low_size >> 20));
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