1 #ifndef _LINUX_BINFMTS_H 2 #define _LINUX_BINFMTS_H 3 4 #include <linux/capability.h> 5 6 struct pt_regs; 7 8 /* 9 * MAX_ARG_PAGES defines the number of pages allocated for arguments 10 * and envelope for the new program. 32 should suffice, this gives 11 * a maximum env+arg of 128kB w/4KB pages! 12 */ 13 #define MAX_ARG_PAGES 32 14 15 /* sizeof(linux_binprm->buf) */ 16 #define BINPRM_BUF_SIZE 128 17 18 #ifdef __KERNEL__ 19 20 /* 21 * This structure is used to hold the arguments that are used when loading binaries. 22 */ 23 struct linux_binprm{ 24 char buf[BINPRM_BUF_SIZE]; 25 struct page *page[MAX_ARG_PAGES]; 26 struct mm_struct *mm; 27 unsigned long p; /* current top of mem */ 28 int sh_bang; 29 struct file * file; 30 int e_uid, e_gid; 31 kernel_cap_t cap_inheritable, cap_permitted, cap_effective; 32 void *security; 33 int argc, envc; 34 char * filename; /* Name of binary as seen by procps */ 35 char * interp; /* Name of the binary really executed. Most 36 of the time same as filename, but could be 37 different for binfmt_{misc,script} */ 38 unsigned interp_flags; 39 unsigned interp_data; 40 unsigned long loader, exec; 41 }; 42 43 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 44 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 45 46 /* fd of the binary should be passed to the interpreter */ 47 #define BINPRM_FLAGS_EXECFD_BIT 1 48 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 49 50 51 /* 52 * This structure defines the functions that are used to load the binary formats that 53 * linux accepts. 54 */ 55 struct linux_binfmt { 56 struct linux_binfmt * next; 57 struct module *module; 58 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 59 int (*load_shlib)(struct file *); 60 int (*core_dump)(long signr, struct pt_regs * regs, struct file * file); 61 unsigned long min_coredump; /* minimal dump size */ 62 }; 63 64 extern int register_binfmt(struct linux_binfmt *); 65 extern int unregister_binfmt(struct linux_binfmt *); 66 67 extern int prepare_binprm(struct linux_binprm *); 68 extern void remove_arg_zero(struct linux_binprm *); 69 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *); 70 extern int flush_old_exec(struct linux_binprm * bprm); 71 72 extern int suid_dumpable; 73 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 74 #define SUID_DUMP_USER 1 /* Dump as user of process */ 75 #define SUID_DUMP_ROOT 2 /* Dump as root */ 76 77 /* Stack area protections */ 78 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 79 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 80 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 81 82 extern int setup_arg_pages(struct linux_binprm * bprm, 83 unsigned long stack_top, 84 int executable_stack); 85 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); 86 extern void compute_creds(struct linux_binprm *binprm); 87 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs); 88 extern int set_binfmt(struct linux_binfmt *new); 89 90 #endif /* __KERNEL__ */ 91 #endif /* _LINUX_BINFMTS_H */ 92