X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=fs%2Fbinfmt_elf_fdpic.c;h=2f5d8dbe676d607867af7019501d754ce7334fe4;hb=5c4c1489b93c9dc51cc6e97fd73e325ce94983c0;hp=5810aa1339fdeb5d6d98dd857328998bcde733e5;hpb=b312362be6d9155b66f3a26d9159e0a680fbd6c5;p=cascardo%2Flinux.git diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 5810aa1339fd..2f5d8dbe676d 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -30,7 +30,6 @@ #include #include #include -#include #include #include #include @@ -179,6 +178,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, int executable_stack; int retval, i; + kdebug("____ LOAD %d ____", current->pid); + memset(&exec_params, 0, sizeof(exec_params)); memset(&interp_params, 0, sizeof(interp_params)); @@ -620,8 +621,8 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm, p = (char __user *) current->mm->arg_start; for (loop = bprm->argc; loop > 0; loop--) { __put_user((elf_caddr_t) p, argv++); - len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES); - if (!len || len > PAGE_SIZE * MAX_ARG_PAGES) + len = strnlen_user(p, MAX_ARG_STRLEN); + if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } @@ -632,8 +633,8 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm, current->mm->env_start = (unsigned long) p; for (loop = bprm->envc; loop > 0; loop--) { __put_user((elf_caddr_t)(unsigned long) p, envp++); - len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES); - if (!len || len > PAGE_SIZE * MAX_ARG_PAGES) + len = strnlen_user(p, MAX_ARG_STRLEN); + if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } @@ -941,8 +942,11 @@ static int elf_fdpic_map_file_constdisp_on_uclinux( if (mm) { if (phdr->p_flags & PF_X) { - mm->start_code = seg->addr; - mm->end_code = seg->addr + phdr->p_memsz; + if (!mm->start_code) { + mm->start_code = seg->addr; + mm->end_code = seg->addr + + phdr->p_memsz; + } } else if (!mm->start_data) { mm->start_data = seg->addr; #ifndef CONFIG_MMU @@ -1123,8 +1127,10 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, if (mm) { if (phdr->p_flags & PF_X) { - mm->start_code = maddr; - mm->end_code = maddr + phdr->p_memsz; + if (!mm->start_code) { + mm->start_code = maddr; + mm->end_code = maddr + phdr->p_memsz; + } } else if (!mm->start_data) { mm->start_data = maddr; mm->end_data = maddr + phdr->p_memsz; @@ -1175,8 +1181,10 @@ static int dump_seek(struct file *file, loff_t off) * * I think we should skip something. But I am not sure how. H.J. */ -static int maydump(struct vm_area_struct *vma) +static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) { + int dump_ok; + /* Do not dump I/O mapped devices or special mappings */ if (vma->vm_flags & (VM_IO | VM_RESERVED)) { kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); @@ -1191,27 +1199,35 @@ static int maydump(struct vm_area_struct *vma) return 0; } - /* Dump shared memory only if mapped from an anonymous file. */ + /* By default, dump shared memory if mapped from an anonymous file. */ if (vma->vm_flags & VM_SHARED) { if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { - kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags); - return 1; + dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); + kdcore("%08lx: %08lx: %s (share)", vma->vm_start, + vma->vm_flags, dump_ok ? "yes" : "no"); + return dump_ok; } - kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags); - return 0; + dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); + kdcore("%08lx: %08lx: %s (share)", vma->vm_start, + vma->vm_flags, dump_ok ? "yes" : "no"); + return dump_ok; } #ifdef CONFIG_MMU - /* If it hasn't been written to, don't write it out */ + /* By default, if it hasn't been written to, don't write it out */ if (!vma->anon_vma) { - kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags); - return 0; + dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); + kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, + vma->vm_flags, dump_ok ? "yes" : "no"); + return dump_ok; } #endif - kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags); - return 1; + dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); + kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, + dump_ok ? "yes" : "no"); + return dump_ok; } /* An ELF note in memory */ @@ -1450,15 +1466,15 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t) * dump the segments for an MMU process */ #ifdef CONFIG_MMU -static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm, - size_t *size, unsigned long *limit) +static int elf_fdpic_dump_segments(struct file *file, size_t *size, + unsigned long *limit, unsigned long mm_flags) { struct vm_area_struct *vma; for (vma = current->mm->mmap; vma; vma = vma->vm_next) { unsigned long addr; - if (!maydump(vma)) + if (!maydump(vma, mm_flags)) continue; for (addr = vma->vm_start; @@ -1473,8 +1489,8 @@ static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm, DUMP_SEEK(file->f_pos + PAGE_SIZE); } else if (page == ZERO_PAGE(addr)) { - DUMP_SEEK(file->f_pos + PAGE_SIZE); page_cache_release(page); + DUMP_SEEK(file->f_pos + PAGE_SIZE); } else { void *kaddr; @@ -1505,15 +1521,15 @@ end_coredump: * dump the segments for a NOMMU process */ #ifndef CONFIG_MMU -static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm, - size_t *size, unsigned long *limit) +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; - if (!maydump(vma)) + if (!maydump(vma, mm_flags)) continue; if ((*size += PAGE_SIZE) > *limit) @@ -1564,6 +1580,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, struct vm_list_struct *vml; #endif elf_addr_t *auxv; + unsigned long mm_flags; /* * We no longer stop all VM operations. @@ -1701,6 +1718,13 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, /* Page-align dumped data */ dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); + /* + * We must use the same mm->flags while dumping core to avoid + * inconsistency between the program headers and bodies, otherwise an + * unusable core file can be generated. + */ + mm_flags = current->mm->flags; + /* write program headers for segments dump */ for ( #ifdef CONFIG_MMU @@ -1722,7 +1746,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, phdr.p_offset = offset; phdr.p_vaddr = vma->vm_start; phdr.p_paddr = 0; - phdr.p_filesz = maydump(vma) ? sz : 0; + phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; phdr.p_memsz = sz; offset += phdr.p_filesz; phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; @@ -1756,7 +1780,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, DUMP_SEEK(dataoff); - if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0) + if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) goto end_coredump; #ifdef ELF_CORE_WRITE_EXTRA_DATA