1#ifndef _LINUX_BINFMTS_H 2#define _LINUX_BINFMTS_H 3 4#include <linux/capability.h> 5 6struct pt_regs; 7 8/* 9 * These are the maximum length and maximum number of strings passed to the 10 * execve() system call. MAX_ARG_STRLEN is essentially random but serves to 11 * prevent the kernel from being unduly impacted by misaddressed pointers. 12 * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer. 13 */ 14#define MAX_ARG_STRLEN (PAGE_SIZE * 32) 15#define MAX_ARG_STRINGS 0x7FFFFFFF 16 17/* sizeof(linux_binprm->buf) */ 18#define BINPRM_BUF_SIZE 128 19 20#ifdef __KERNEL__ 21#include <linux/sched.h> 22 23#define CORENAME_MAX_SIZE 128 24 25/* 26 * This structure is used to hold the arguments that are used when loading binaries. 27 */ 28struct linux_binprm { 29 char buf[BINPRM_BUF_SIZE]; 30#ifdef CONFIG_MMU 31 struct vm_area_struct *vma; 32 unsigned long vma_pages; 33#else 34# define MAX_ARG_PAGES 32 35 struct page *page[MAX_ARG_PAGES]; 36#endif 37 struct mm_struct *mm; 38 unsigned long p; /* current top of mem */ 39 unsigned int 40 cred_prepared:1,/* true if creds already prepared (multiple 41 * preps happen for interpreters) */ 42 cap_effective:1;/* true if has elevated effective capabilities, 43 * false if not; except for init which inherits 44 * its parent's caps anyway */ 45#ifdef __alpha__ 46 unsigned int taso:1; 47#endif 48 unsigned int recursion_depth; 49 struct file * file; 50 struct cred *cred; /* new credentials */ 51 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 52 unsigned int per_clear; /* bits to clear in current->personality */ 53 int argc, envc; 54 const char * filename; /* Name of binary as seen by procps */ 55 const char * interp; /* Name of the binary really executed. Most 56 of the time same as filename, but could be 57 different for binfmt_{misc,script} */ 58 unsigned interp_flags; 59 unsigned interp_data; 60 unsigned long loader, exec; 61 char tcomm[TASK_COMM_LEN]; 62}; 63 64#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 65#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 66 67/* fd of the binary should be passed to the interpreter */ 68#define BINPRM_FLAGS_EXECFD_BIT 1 69#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 70 71#define BINPRM_MAX_RECURSION 4 72 73/* Function parameter for binfmt->coredump */ 74struct coredump_params { 75 long signr; 76 struct pt_regs *regs; 77 struct file *file; 78 unsigned long limit; 79 unsigned long mm_flags; 80}; 81 82/* 83 * This structure defines the functions that are used to load the binary formats that 84 * linux accepts. 85 */ 86struct linux_binfmt { 87 struct list_head lh; 88 struct module *module; 89 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 90 int (*load_shlib)(struct file *); 91 int (*core_dump)(struct coredump_params *cprm); 92 unsigned long min_coredump; /* minimal dump size */ 93}; 94 95extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 96 97/* Registration of default binfmt handlers */ 98static inline void register_binfmt(struct linux_binfmt *fmt) 99{ 100 __register_binfmt(fmt, 0); 101} 102/* Same as above, but adds a new binfmt at the top of the list */ 103static inline void insert_binfmt(struct linux_binfmt *fmt) 104{ 105 __register_binfmt(fmt, 1); 106} 107 108extern void unregister_binfmt(struct linux_binfmt *); 109 110extern int prepare_binprm(struct linux_binprm *); 111extern int __must_check remove_arg_zero(struct linux_binprm *); 112extern int search_binary_handler(struct linux_binprm *, struct pt_regs *); 113extern int flush_old_exec(struct linux_binprm * bprm); 114extern void setup_new_exec(struct linux_binprm * bprm); 115extern void would_dump(struct linux_binprm *, struct file *); 116 117extern int suid_dumpable; 118#define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 119#define SUID_DUMP_USER 1 /* Dump as user of process */ 120#define SUID_DUMP_ROOT 2 /* Dump as root */ 121 122/* Stack area protections */ 123#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 124#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 125#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 126 127extern int setup_arg_pages(struct linux_binprm * bprm, 128 unsigned long stack_top, 129 int executable_stack); 130extern int bprm_mm_init(struct linux_binprm *bprm); 131extern int copy_strings_kernel(int argc, const char *const *argv, 132 struct linux_binprm *bprm); 133extern int prepare_bprm_creds(struct linux_binprm *bprm); 134extern void install_exec_creds(struct linux_binprm *bprm); 135extern void do_coredump(long signr, int exit_code, struct pt_regs *regs); 136extern void set_binfmt(struct linux_binfmt *new); 137extern void free_bprm(struct linux_binprm *); 138 139#endif /* __KERNEL__ */ 140#endif /* _LINUX_BINFMTS_H */ 141