nfsd: nfsd should drop CAP_MKNOD for non-root

[safe/jmp/linux-2.6] / fs / binfmt_elf_fdpic.c

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 5b5424c..f3e72c5 100644 (file)
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -168,9 +168,6 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        struct elf_fdpic_params exec_params, interp_params;
        struct elf_phdr *phdr;
        unsigned long stack_size, entryaddr;
-#ifndef CONFIG_MMU
-       unsigned long fullsize;
-#endif
 #ifdef ELF_FDPIC_PLAT_INIT
        unsigned long dynaddr;
 #endif
@@ -390,11 +387,6 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
                goto error_kill;
        }
 
-       /* expand the stack mapping to use up the entire allocation granule */
-       fullsize = kobjsize((char *) current->mm->start_brk);
-       if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
-                                   fullsize, 0, 0)))
-               stack_size = fullsize;
        up_write(&current->mm->mmap_sem);
 
        current->mm->brk = current->mm->start_brk;
@@ -404,7 +396,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        current->mm->start_stack = current->mm->start_brk + stack_size;
 #endif
 
-       compute_creds(bprm);
+       install_exec_creds(bprm);
        current->flags &= ~PF_FORKNOEXEC;
        if (create_elf_fdpic_tables(bprm, current->mm,
                                    &exec_params, &interp_params) < 0)
@@ -475,6 +467,7 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
                                   struct elf_fdpic_params *exec_params,
                                   struct elf_fdpic_params *interp_params)
 {
+       const struct cred *cred = current_cred();
        unsigned long sp, csp, nitems;
        elf_caddr_t __user *argv, *envp;
        size_t platform_len = 0, len;
@@ -623,10 +616,10 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
        NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
        NEW_AUX_ENT(AT_FLAGS,   0);
        NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
-       NEW_AUX_ENT(AT_UID,     (elf_addr_t) current->uid);
-       NEW_AUX_ENT(AT_EUID,    (elf_addr_t) current->euid);
-       NEW_AUX_ENT(AT_GID,     (elf_addr_t) current->gid);
-       NEW_AUX_ENT(AT_EGID,    (elf_addr_t) current->egid);
+       NEW_AUX_ENT(AT_UID,     (elf_addr_t) cred->uid);
+       NEW_AUX_ENT(AT_EUID,    (elf_addr_t) cred->euid);
+       NEW_AUX_ENT(AT_GID,     (elf_addr_t) cred->gid);
+       NEW_AUX_ENT(AT_EGID,    (elf_addr_t) cred->egid);
        NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
        NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
 
@@ -1413,6 +1406,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
                       struct mm_struct *mm)
 {
+       const struct cred *cred;
        unsigned int i, len;
 
        /* first copy the parameters from user space */
@@ -1440,8 +1434,11 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
        psinfo->pr_zomb = psinfo->pr_sname == 'Z';
        psinfo->pr_nice = task_nice(p);
        psinfo->pr_flag = p->flags;
-       SET_UID(psinfo->pr_uid, p->uid);
-       SET_GID(psinfo->pr_gid, p->gid);
+       rcu_read_lock();
+       cred = __task_cred(p);
+       SET_UID(psinfo->pr_uid, cred->uid);
+       SET_GID(psinfo->pr_gid, cred->gid);
+       rcu_read_unlock();
        strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
 
        return 0;
@@ -1562,11 +1559,9 @@ end_coredump:
 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                           unsigned long *limit, unsigned long mm_flags)
 {
-       struct vm_list_struct *vml;
-
-       for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
-       struct vm_area_struct *vma = vml->vma;
+       struct vm_area_struct *vma;
 
+       for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                if (!maydump(vma, mm_flags))
                        continue;
 
@@ -1612,9 +1607,6 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        elf_fpxregset_t *xfpu = NULL;
 #endif
        int thread_status_size = 0;
-#ifndef CONFIG_MMU
-       struct vm_list_struct *vml;
-#endif
        elf_addr_t *auxv;
        unsigned long mm_flags;
 
@@ -1680,13 +1672,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        fill_prstatus(prstatus, current, signr);
        elf_core_copy_regs(&prstatus->pr_reg, regs);
 
-#ifdef CONFIG_MMU
        segs = current->mm->map_count;
-#else
-       segs = 0;
-       for (vml = current->mm->context.vmlist; vml; vml = vml->next)
-           segs++;
-#endif
 #ifdef ELF_CORE_EXTRA_PHDRS
        segs += ELF_CORE_EXTRA_PHDRS;
 #endif
@@ -1761,20 +1747,10 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        mm_flags = current->mm->flags;
 
        /* write program headers for segments dump */
-       for (
-#ifdef CONFIG_MMU
-               vma = current->mm->mmap; vma; vma = vma->vm_next
-#else
-                       vml = current->mm->context.vmlist; vml; vml = vml->next
-#endif
-            ) {
+       for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                struct elf_phdr phdr;
                size_t sz;
 
-#ifndef CONFIG_MMU
-               vma = vml->vma;
-#endif
-
                sz = vma->vm_end - vma->vm_start;
 
                phdr.p_type = PT_LOAD;