diff options
| -rw-r--r-- | fs/binfmt_elf.c | 324 |
1 files changed, 194 insertions, 130 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index b8bca1e..4510429 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1395,7 +1395,8 @@ static int writenote(struct memelfnote *men, struct file *file, if (!dump_seek(file, (off))) \ goto end_coredump; -static void fill_elf_header(struct elfhdr *elf, int segs) +static void fill_elf_header(struct elfhdr *elf, int segs, + u16 machine, u32 flags, u8 osabi) { memcpy(elf->e_ident, ELFMAG, SELFMAG); elf->e_ident[EI_CLASS] = ELF_CLASS; @@ -1405,12 +1406,12 @@ static void fill_elf_header(struct elfhdr *elf, int segs) memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); elf->e_type = ET_CORE; - elf->e_machine = ELF_ARCH; + elf->e_machine = machine; elf->e_version = EV_CURRENT; elf->e_entry = 0; elf->e_phoff = sizeof(struct elfhdr); elf->e_shoff = 0; - elf->e_flags = ELF_CORE_EFLAGS; + elf->e_flags = flags; elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize = sizeof(struct elf_phdr); elf->e_phnum = segs; @@ -1517,6 +1518,16 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, return 0; } +static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) +{ + elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; + int i = 0; + do + i += 2; + while (auxv[i - 2] != AT_NULL); + fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); +} + /* Here is the structure in which status of each thread is captured. */ struct elf_thread_status { @@ -1569,6 +1580,174 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t) return sz; } +struct elf_note_info { + struct memelfnote *notes; + struct elf_prstatus *prstatus; /* NT_PRSTATUS */ + struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ + struct list_head thread_list; + elf_fpregset_t *fpu; +#ifdef ELF_CORE_COPY_XFPREGS + elf_fpxregset_t *xfpu; +#endif + int thread_status_size; + int numnote; +}; + +static int fill_note_info(struct elfhdr *elf, int phdrs, + struct elf_note_info *info, + long signr, struct pt_regs *regs) +{ +#define NUM_NOTES 6 + struct list_head *t; + struct task_struct *g, *p; + + info->notes = NULL; + info->prstatus = NULL; + info->psinfo = NULL; + info->fpu = NULL; +#ifdef ELF_CORE_COPY_XFPREGS + info->xfpu = NULL; +#endif + INIT_LIST_HEAD(&info->thread_list); + + info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), + GFP_KERNEL); + if (!info->notes) + return 0; + info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); + if (!info->psinfo) + return 0; + info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); + if (!info->prstatus) + return 0; + info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); + if (!info->fpu) + return 0; +#ifdef ELF_CORE_COPY_XFPREGS + info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); + if (!info->xfpu) + return 0; +#endif + + info->thread_status_size = 0; + if (signr) { + struct elf_thread_status *tmp; + rcu_read_lock(); + do_each_thread(g, p) + if (current->mm == p->mm && current != p) { + tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); + if (!tmp) { + rcu_read_unlock(); + return 0; + } + tmp->thread = p; + list_add(&tmp->list, &info->thread_list); + } + while_each_thread(g, p); + rcu_read_unlock(); + list_for_each(t, &info->thread_list) { + struct elf_thread_status *tmp; + int sz; + + tmp = list_entry(t, struct elf_thread_status, list); + sz = elf_dump_thread_status(signr, tmp); + info->thread_status_size += sz; + } + } + /* now collect the dump for the current */ + memset(info->prstatus, 0, sizeof(*info->prstatus)); + fill_prstatus(info->prstatus, current, signr); + elf_core_copy_regs(&info->prstatus->pr_reg, regs); + + /* Set up header */ + fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI); + + /* + * Set up the notes in similar form to SVR4 core dumps made + * with info from their /proc. + */ + + fill_note(info->notes + 0, "CORE", NT_PRSTATUS, + sizeof(*info->prstatus), info->prstatus); + fill_psinfo(info->psinfo, current->group_leader, current->mm); + fill_note(info->notes + 1, "CORE", NT_PRPSINFO, + sizeof(*info->psinfo), info->psinfo); + + info->numnote = 2; + + fill_auxv_note(&info->notes[info->numnote++], current->mm); + + /* Try to dump the FPU. */ + info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, + info->fpu); + if (info->prstatus->pr_fpvalid) + fill_note(info->notes + info->numnote++, + "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); +#ifdef ELF_CORE_COPY_XFPREGS + if (elf_core_copy_task_xfpregs(current, info->xfpu)) + fill_note(info->notes + info->numnote++, + "LINUX", ELF_CORE_XFPREG_TYPE, + sizeof(*info->xfpu), info->xfpu); +#endif + + return 1; + +#undef NUM_NOTES +} + +static size_t get_note_info_size(struct elf_note_info *info) +{ + int sz = 0; + int i; + + for (i = 0; i < info->numnote; i++) + sz += notesize(info->notes + i); + + sz += info->thread_status_size; + + return sz; +} + +static int write_note_info(struct elf_note_info *info, + struct file *file, loff_t *foffset) +{ + int i; + struct list_head *t; + + for (i = 0; i < info->numnote; i++) + if (!writenote(info->notes + i, file, foffset)) + return 0; + + /* write out the thread status notes section */ + list_for_each(t, &info->thread_list) { + struct elf_thread_status *tmp = + list_entry(t, struct elf_thread_status, list); + + for (i = 0; i < tmp->num_notes; i++) + if (!writenote(&tmp->notes[i], file, foffset)) + return 0; + } + + return 1; +} + +static void free_note_info(struct elf_note_info *info) +{ + while (!list_empty(&info->thread_list)) { + struct list_head *tmp = info->thread_list.next; + list_del(tmp); + kfree(list_entry(tmp, struct elf_thread_status, list)); + } + + kfree(info->prstatus); + kfree(info->psinfo); + kfree(info->notes); + kfree(info->fpu); +#ifdef ELF_CORE_COPY_XFPREGS + kfree(info->xfpu); +#endif +} + static struct vm_area_struct *first_vma(struct task_struct *tsk, struct vm_area_struct *gate_vma) { @@ -1604,29 +1783,15 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, */ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit) { -#define NUM_NOTES 6 int has_dumped = 0; mm_segment_t fs; int segs; size_t size = 0; - int i; struct vm_area_struct *vma, *gate_vma; struct elfhdr *elf = NULL; loff_t offset = 0, dataoff, foffset; - int numnote; - struct memelfnote *notes = NULL; - struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ - struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ - struct task_struct *g, *p; - LIST_HEAD(thread_list); - struct list_head *t; - elf_fpregset_t *fpu = NULL; -#ifdef ELF_CORE_COPY_XFPREGS - elf_fpxregset_t *xfpu = NULL; -#endif - int thread_status_size = 0; - elf_addr_t *auxv; unsigned long mm_flags; + struct elf_note_info info; /* * We no longer stop all VM operations. @@ -1644,52 +1809,6 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un elf = kmalloc(sizeof(*elf), GFP_KERNEL); if (!elf) goto cleanup; - prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL); - if (!prstatus) - goto cleanup; - psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); - if (!psinfo) - goto cleanup; - notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); - if (!notes) - goto cleanup; - fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); - if (!fpu) - goto cleanup; -#ifdef ELF_CORE_COPY_XFPREGS - xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); - if (!xfpu) - goto cleanup; -#endif - - if (signr) { - struct elf_thread_status *tmp; - rcu_read_lock(); - do_each_thread(g,p) - if (current->mm == p->mm && current != p) { - tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); - if (!tmp) { - rcu_read_unlock(); - goto cleanup; - } - tmp->thread = p; - list_add(&tmp->list, &thread_list); - } - while_each_thread(g,p); - rcu_read_unlock(); - list_for_each(t, &thread_list) { - struct elf_thread_status *tmp; - int sz; - - tmp = list_entry(t, struct elf_thread_status, list); - sz = elf_dump_thread_status(signr, tmp); - thread_status_size += sz; - } - } - /* now collect the dump for the current */ - memset(prstatus, 0, sizeof(*prstatus)); - fill_prstatus(prstatus, current, signr); - elf_core_copy_regs(&prstatus->pr_reg, regs); segs = current->mm->map_count; #ifdef ELF_CORE_EXTRA_PHDRS @@ -1700,42 +1819,16 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un if (gate_vma != NULL) segs++; - /* Set up header */ - fill_elf_header(elf, segs + 1); /* including notes section */ - - has_dumped = 1; - current->flags |= PF_DUMPCORE; - /* - * Set up the notes in similar form to SVR4 core dumps made - * with info from their /proc. + * Collect all the non-memory information about the process for the + * notes. This also sets up the file header. */ + if (!fill_note_info(elf, segs + 1, /* including notes section */ + &info, signr, regs)) + goto cleanup; - fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); - fill_psinfo(psinfo, current->group_leader, current->mm); - fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); - - numnote = 2; - - auxv = (elf_addr_t *)current->mm->saved_auxv; - - i = 0; - do - i += 2; - while (auxv[i - 2] != AT_NULL); - fill_note(¬es[numnote++], "CORE", NT_AUXV, - i * sizeof(elf_addr_t), auxv); - - /* Try to dump the FPU. */ - if ((prstatus->pr_fpvalid = - elf_core_copy_task_fpregs(current, regs, fpu))) - fill_note(notes + numnote++, - "CORE", NT_PRFPREG, sizeof(*fpu), fpu); -#ifdef ELF_CORE_COPY_XFPREGS - if (elf_core_copy_task_xfpregs(current, xfpu)) - fill_note(notes + numnote++, - "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); -#endif + has_dumped = 1; + current->flags |= PF_DUMPCORE; fs = get_fs(); set_fs(KERNEL_DS); @@ -1748,12 +1841,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un /* Write notes phdr entry */ { struct elf_phdr phdr; - int sz = 0; - - for (i = 0; i < numnote; i++) - sz += notesize(notes + i); - - sz += thread_status_size; + size_t sz = get_note_info_size(&info); sz += elf_coredump_extra_notes_size(); @@ -1798,23 +1886,12 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un #endif /* write out the notes section */ - for (i = 0; i < numnote; i++) - if (!writenote(notes + i, file, &foffset)) - goto end_coredump; + if (!write_note_info(&info, file, &foffset)) + goto end_coredump; if (elf_coredump_extra_notes_write(file, &foffset)) goto end_coredump; - /* write out the thread status notes section */ - list_for_each(t, &thread_list) { - struct elf_thread_status *tmp = - list_entry(t, struct elf_thread_status, list); - - for (i = 0; i < tmp->num_notes; i++) - if (!writenote(&tmp->notes[i], file, &foffset)) - goto end_coredump; - } - /* Align to page */ DUMP_SEEK(dataoff - foffset); @@ -1865,22 +1942,9 @@ end_coredump: set_fs(fs); cleanup: - while (!list_empty(&thread_list)) { - struct list_head *tmp = thread_list.next; - list_del(tmp); - kfree(list_entry(tmp, struct elf_thread_status, list)); - } - kfree(elf); - kfree(prstatus); - kfree(psinfo); - kfree(notes); - kfree(fpu); -#ifdef ELF_CORE_COPY_XFPREGS - kfree(xfpu); -#endif + free_note_info(&info); return has_dumped; -#undef NUM_NOTES } #endif /* USE_ELF_CORE_DUMP */ |
