struct pt_regs;
/*
- * MAX_ARG_PAGES defines the number of pages allocated for arguments
- * and envelope for the new program. 32 should suffice, this gives
- * a maximum env+arg of 128kB w/4KB pages!
+ * These are the maximum length and maximum number of strings passed to the
+ * execve() system call. MAX_ARG_STRLEN is essentially random but serves to
+ * prevent the kernel from being unduly impacted by misaddressed pointers.
+ * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
*/
-#define MAX_ARG_PAGES 32
+#define MAX_ARG_STRLEN (PAGE_SIZE * 32)
+#define MAX_ARG_STRINGS 0x7FFFFFFF
/* sizeof(linux_binprm->buf) */
#define BINPRM_BUF_SIZE 128
#ifdef __KERNEL__
+#include <linux/list.h>
#define CORENAME_MAX_SIZE 128
*/
struct linux_binprm{
char buf[BINPRM_BUF_SIZE];
+#ifdef CONFIG_MMU
+ struct vm_area_struct *vma;
+#else
+# define MAX_ARG_PAGES 32
struct page *page[MAX_ARG_PAGES];
+#endif
struct mm_struct *mm;
unsigned long p; /* current top of mem */
- int sh_bang;
+ unsigned int
+ cred_prepared:1,/* true if creds already prepared (multiple
+ * preps happen for interpreters) */
+ cap_effective:1;/* true if has elevated effective capabilities,
+ * false if not; except for init which inherits
+ * its parent's caps anyway */
+#ifdef __alpha__
+ unsigned int taso:1;
+#endif
+ unsigned int recursion_depth;
struct file * file;
- int e_uid, e_gid;
- kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
- void *security;
+ struct cred *cred; /* new credentials */
+ int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
+ unsigned int per_clear; /* bits to clear in current->personality */
int argc, envc;
char * filename; /* Name of binary as seen by procps */
char * interp; /* Name of the binary really executed. Most
#define BINPRM_FLAGS_EXECFD_BIT 1
#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
+#define BINPRM_MAX_RECURSION 4
+
+/* Function parameter for binfmt->coredump */
+struct coredump_params {
+ long signr;
+ struct pt_regs *regs;
+ struct file *file;
+ unsigned long limit;
+};
/*
* This structure defines the functions that are used to load the binary formats that
* linux accepts.
*/
struct linux_binfmt {
- struct linux_binfmt * next;
+ struct list_head lh;
struct module *module;
int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
int (*load_shlib)(struct file *);
- int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
+ int (*core_dump)(struct coredump_params *cprm);
unsigned long min_coredump; /* minimal dump size */
int hasvdso;
};
-extern int register_binfmt(struct linux_binfmt *);
-extern int unregister_binfmt(struct linux_binfmt *);
+extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
+
+/* Registration of default binfmt handlers */
+static inline int register_binfmt(struct linux_binfmt *fmt)
+{
+ return __register_binfmt(fmt, 0);
+}
+/* Same as above, but adds a new binfmt at the top of the list */
+static inline int insert_binfmt(struct linux_binfmt *fmt)
+{
+ return __register_binfmt(fmt, 1);
+}
+
+extern void unregister_binfmt(struct linux_binfmt *);
extern int prepare_binprm(struct linux_binprm *);
-extern void remove_arg_zero(struct linux_binprm *);
+extern int __must_check remove_arg_zero(struct linux_binprm *);
extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
extern int flush_old_exec(struct linux_binprm * bprm);
extern int setup_arg_pages(struct linux_binprm * bprm,
unsigned long stack_top,
int executable_stack);
+extern int bprm_mm_init(struct linux_binprm *bprm);
extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
-extern void compute_creds(struct linux_binprm *binprm);
-extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
-extern int set_binfmt(struct linux_binfmt *new);
+extern int prepare_bprm_creds(struct linux_binprm *bprm);
+extern void install_exec_creds(struct linux_binprm *bprm);
+extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
+extern void set_binfmt(struct linux_binfmt *new);
+extern void free_bprm(struct linux_binprm *);
#endif /* __KERNEL__ */
#endif /* _LINUX_BINFMTS_H */