diff options
Diffstat (limited to 'include/linux/kallsyms.h')
| -rw-r--r-- | include/linux/kallsyms.h | 118 |
1 files changed, 82 insertions, 36 deletions
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h index 6883e197acb9..d5dd54c53ace 100644 --- a/include/linux/kallsyms.h +++ b/include/linux/kallsyms.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* Rewritten and vastly simplified by Rusty Russell for in-kernel * module loader: * Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation @@ -6,24 +7,76 @@ #define _LINUX_KALLSYMS_H #include <linux/errno.h> +#include <linux/buildid.h> #include <linux/kernel.h> #include <linux/stddef.h> +#include <linux/mm.h> +#include <linux/module.h> -#define KSYM_NAME_LEN 128 -#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ - 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) +#include <asm/sections.h> +#define KSYM_NAME_LEN 512 +#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s %s]") + \ + (KSYM_NAME_LEN - 1) + \ + 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + \ + (BUILD_ID_SIZE_MAX * 2) + 1) + +struct cred; struct module; +static inline int is_kernel_text(unsigned long addr) +{ + if (__is_kernel_text(addr)) + return 1; + return in_gate_area_no_mm(addr); +} + +static inline int is_kernel(unsigned long addr) +{ + if (__is_kernel(addr)) + return 1; + return in_gate_area_no_mm(addr); +} + +static inline int is_ksym_addr(unsigned long addr) +{ + if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) + return is_kernel(addr); + + return is_kernel_text(addr) || is_kernel_inittext(addr); +} + +static inline void *dereference_symbol_descriptor(void *ptr) +{ +#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS + struct module *mod; + + ptr = dereference_kernel_function_descriptor(ptr); + if (is_ksym_addr((unsigned long)ptr)) + return ptr; + + guard(rcu)(); + mod = __module_address((unsigned long)ptr); + + if (mod) + ptr = dereference_module_function_descriptor(mod, ptr); +#endif + return ptr; +} + +/* How and when do we show kallsyms values? */ +extern bool kallsyms_show_value(const struct cred *cred); + #ifdef CONFIG_KALLSYMS +unsigned long kallsyms_sym_address(int idx); +int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long), + void *data); +int kallsyms_on_each_match_symbol(int (*fn)(void *, unsigned long), + const char *name, void *data); + /* Lookup the address for a symbol. Returns 0 if not found. */ unsigned long kallsyms_lookup_name(const char *name); -/* Call a function on each kallsyms symbol in the core kernel */ -int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, - unsigned long), - void *data); - extern int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, unsigned long *offset); @@ -36,14 +89,12 @@ const char *kallsyms_lookup(unsigned long addr, /* Look up a kernel symbol and return it in a text buffer. */ extern int sprint_symbol(char *buffer, unsigned long address); +extern int sprint_symbol_build_id(char *buffer, unsigned long address); extern int sprint_symbol_no_offset(char *buffer, unsigned long address); extern int sprint_backtrace(char *buffer, unsigned long address); - -/* Look up a kernel symbol and print it to the kernel messages. */ -extern void __print_symbol(const char *fmt, unsigned long address); +extern int sprint_backtrace_build_id(char *buffer, unsigned long address); int lookup_symbol_name(unsigned long addr, char *symname); -int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); #else /* !CONFIG_KALLSYMS */ @@ -52,14 +103,6 @@ static inline unsigned long kallsyms_lookup_name(const char *name) return 0; } -static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, - struct module *, - unsigned long), - void *data) -{ - return 0; -} - static inline int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, unsigned long *offset) @@ -81,6 +124,12 @@ static inline int sprint_symbol(char *buffer, unsigned long addr) return 0; } +static inline int sprint_symbol_build_id(char *buffer, unsigned long address) +{ + *buffer = '\0'; + return 0; +} + static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr) { *buffer = '\0'; @@ -93,36 +142,33 @@ static inline int sprint_backtrace(char *buffer, unsigned long addr) return 0; } -static inline int lookup_symbol_name(unsigned long addr, char *symname) +static inline int sprint_backtrace_build_id(char *buffer, unsigned long addr) { - return -ERANGE; + *buffer = '\0'; + return 0; } -static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) +static inline int lookup_symbol_name(unsigned long addr, char *symname) { return -ERANGE; } -/* Stupid that this does nothing, but I didn't create this mess. */ -#define __print_symbol(fmt, addr) -#endif /*CONFIG_KALLSYMS*/ - -/* This macro allows us to keep printk typechecking */ -static __printf(1, 2) -void __check_printsym_format(const char *fmt, ...) +static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long), + void *data) { + return -EOPNOTSUPP; } -static inline void print_symbol(const char *fmt, unsigned long addr) +static inline int kallsyms_on_each_match_symbol(int (*fn)(void *, unsigned long), + const char *name, void *data) { - __check_printsym_format(fmt, ""); - __print_symbol(fmt, (unsigned long) - __builtin_extract_return_addr((void *)addr)); + return -EOPNOTSUPP; } +#endif /*CONFIG_KALLSYMS*/ -static inline void print_ip_sym(unsigned long ip) +static inline void print_ip_sym(const char *loglvl, unsigned long ip) { - printk("[<%p>] %pS\n", (void *) ip, (void *) ip); + printk("%s[<%px>] %pS\n", loglvl, (void *) ip, (void *) ip); } #endif /*_LINUX_KALLSYMS_H*/ |