bdf4c48af2
The purpose of audit_bprm() is to log the argv array to a userspace daemon at the end of the execve system call. Since user-space hasn't had time to run, this array is still in pristine state on the process' stack; so no need to copy it, we can just grab it from there. In order to minimize the damage to audit_log_*() copy each string into a temporary kernel buffer first. Currently the audit code requires that the full argument vector fits in a single packet. So currently it does clip the argv size to a (sysctl) limit, but only when execve auditing is enabled. If the audit protocol gets extended to allow for multiple packets this check can be removed. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ollie Wild <aaw@google.com> Cc: <linux-audit@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
#ifndef _LINUX_BINFMTS_H
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#define _LINUX_BINFMTS_H
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#include <linux/capability.h>
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struct pt_regs;
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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 32
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/* sizeof(linux_binprm->buf) */
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#define BINPRM_BUF_SIZE 128
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#ifdef __KERNEL__
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#define CORENAME_MAX_SIZE 128
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/*
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* This structure is used to hold the arguments that are used when loading binaries.
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*/
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struct linux_binprm{
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char buf[BINPRM_BUF_SIZE];
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struct page *page[MAX_ARG_PAGES];
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struct mm_struct *mm;
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unsigned long p; /* current top of mem */
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int sh_bang;
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struct file * file;
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int e_uid, e_gid;
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kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
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void *security;
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int argc, envc;
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char * filename; /* Name of binary as seen by procps */
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char * interp; /* Name of the binary really executed. Most
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of the time same as filename, but could be
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different for binfmt_{misc,script} */
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unsigned interp_flags;
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unsigned interp_data;
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unsigned long loader, exec;
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unsigned long argv_len;
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};
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#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
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#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
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/* fd of the binary should be passed to the interpreter */
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#define BINPRM_FLAGS_EXECFD_BIT 1
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#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
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/*
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* This structure defines the functions that are used to load the binary formats that
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* linux accepts.
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*/
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struct linux_binfmt {
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struct linux_binfmt * next;
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struct module *module;
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int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
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int (*load_shlib)(struct file *);
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int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
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unsigned long min_coredump; /* minimal dump size */
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int hasvdso;
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};
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extern int register_binfmt(struct linux_binfmt *);
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extern int unregister_binfmt(struct linux_binfmt *);
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extern int prepare_binprm(struct linux_binprm *);
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extern void remove_arg_zero(struct linux_binprm *);
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extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
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extern int flush_old_exec(struct linux_binprm * bprm);
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extern int suid_dumpable;
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#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
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#define SUID_DUMP_USER 1 /* Dump as user of process */
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#define SUID_DUMP_ROOT 2 /* Dump as root */
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/* Stack area protections */
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#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
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#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
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#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
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extern int setup_arg_pages(struct linux_binprm * bprm,
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unsigned long stack_top,
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int executable_stack);
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extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
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extern void compute_creds(struct linux_binprm *binprm);
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extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
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extern int set_binfmt(struct linux_binfmt *new);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_BINFMTS_H */
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