1 #ifndef _LINUX_BINFMTS_H 2 #define _LINUX_BINFMTS_H 3 4 #include <linux/capability.h> 5 6 struct 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/list.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 */ 28 struct linux_binprm{ 29 char buf[BINPRM_BUF_SIZE]; 30 #ifdef CONFIG_MMU 31 struct vm_area_struct *vma; 32 #else 33 # define MAX_ARG_PAGES 32 34 struct page *page[MAX_ARG_PAGES]; 35 #endif 36 struct mm_struct *mm; 37 unsigned long p; /* current top of mem */ 38 unsigned int 39 cred_prepared:1,/* true if creds already prepared (multiple 40 * preps happen for interpreters) */ 41 cap_effective:1;/* true if has elevated effective capabilities, 42 * false if not; except for init which inherits 43 * its parent's caps anyway */ 44 #ifdef __alpha__ 45 unsigned int taso:1; 46 #endif 47 unsigned int recursion_depth; 48 struct file * file; 49 struct cred *cred; /* new credentials */ 50 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 51 unsigned int per_clear; /* bits to clear in current->personality */ 52 int argc, envc; 53 char * filename; /* Name of binary as seen by procps */ 54 char * interp; /* Name of the binary really executed. Most 55 of the time same as filename, but could be 56 different for binfmt_{misc,script} */ 57 unsigned interp_flags; 58 unsigned interp_data; 59 unsigned long loader, exec; 60 }; 61 62 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 63 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 64 65 /* fd of the binary should be passed to the interpreter */ 66 #define BINPRM_FLAGS_EXECFD_BIT 1 67 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 68 69 #define BINPRM_MAX_RECURSION 4 70 71 /* 72 * This structure defines the functions that are used to load the binary formats that 73 * linux accepts. 74 */ 75 struct linux_binfmt { 76 struct list_head lh; 77 struct module *module; 78 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 79 int (*load_shlib)(struct file *); 80 int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit); 81 unsigned long min_coredump; /* minimal dump size */ 82 int hasvdso; 83 }; 84 85 extern int register_binfmt(struct linux_binfmt *); 86 extern void unregister_binfmt(struct linux_binfmt *); 87 88 extern int prepare_binprm(struct linux_binprm *); 89 extern int __must_check remove_arg_zero(struct linux_binprm *); 90 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *); 91 extern int flush_old_exec(struct linux_binprm * bprm); 92 93 extern int suid_dumpable; 94 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 95 #define SUID_DUMP_USER 1 /* Dump as user of process */ 96 #define SUID_DUMP_ROOT 2 /* Dump as root */ 97 98 /* Stack area protections */ 99 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 100 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 101 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 102 103 extern int setup_arg_pages(struct linux_binprm * bprm, 104 unsigned long stack_top, 105 int executable_stack); 106 extern int bprm_mm_init(struct linux_binprm *bprm); 107 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); 108 extern void install_exec_creds(struct linux_binprm *bprm); 109 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs); 110 extern int set_binfmt(struct linux_binfmt *new); 111 extern void free_bprm(struct linux_binprm *); 112 113 #endif /* __KERNEL__ */ 114 #endif /* _LINUX_BINFMTS_H */ 115