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mm: introduce coredump parameter structure
Introduce coredump parameter data structure (struct coredump_params) to simplify binfmt->core_dump() arguments. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Suggested-by: Ingo Molnar <mingo@elte.hu> Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masami Hiramatsu
Linus Torvalds
parent
9cd80bbb07
commit
f6151dfea2
7 changed files with 69 additions and 53 deletions
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@ -32,7 +32,7 @@
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static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
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static int load_aout_library(struct file*);
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static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
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static int aout_core_dump(struct coredump_params *cprm);
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static struct linux_binfmt aout_format = {
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.module = THIS_MODULE,
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@ -89,8 +89,9 @@ if (file->f_op->llseek) { \
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* dumping of the process results in another error..
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*/
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static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
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static int aout_core_dump(struct coredump_params *cprm)
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{
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struct file *file = cprm->file;
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mm_segment_t fs;
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int has_dumped = 0;
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unsigned long dump_start, dump_size;
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@ -108,16 +109,16 @@ static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, u
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current->flags |= PF_DUMPCORE;
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strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
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dump.u_ar0 = offsetof(struct user, regs);
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dump.signal = signr;
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aout_dump_thread(regs, &dump);
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dump.signal = cprm->signr;
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aout_dump_thread(cprm->regs, &dump);
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/* If the size of the dump file exceeds the rlimit, then see what would happen
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if we wrote the stack, but not the data area. */
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if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > limit)
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if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > cprm->limit)
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dump.u_dsize = 0;
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/* Make sure we have enough room to write the stack and data areas. */
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if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
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if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
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dump.u_ssize = 0;
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/* make sure we actually have a data and stack area to dump */
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@ -45,7 +45,7 @@ static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
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* don't even try.
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*/
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#ifdef CONFIG_ELF_CORE
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static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
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static int elf_core_dump(struct coredump_params *cprm);
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#else
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#define elf_core_dump NULL
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#endif
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@ -1273,7 +1273,8 @@ static int writenote(struct memelfnote *men, struct file *file,
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#undef DUMP_WRITE
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#define DUMP_WRITE(addr, nr) \
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if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
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if ((size += (nr)) > cprm->limit || \
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!dump_write(cprm->file, (addr), (nr))) \
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goto end_coredump;
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static void fill_elf_header(struct elfhdr *elf, int segs,
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@ -1901,7 +1902,7 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
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* and then they are actually written out. If we run out of core limit
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* we just truncate.
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*/
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static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
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static int elf_core_dump(struct coredump_params *cprm)
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{
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int has_dumped = 0;
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mm_segment_t fs;
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@ -1947,7 +1948,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
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* notes. This also sets up the file header.
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*/
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if (!fill_note_info(elf, segs + 1, /* including notes section */
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&info, signr, regs))
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&info, cprm->signr, cprm->regs))
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goto cleanup;
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has_dumped = 1;
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@ -2009,14 +2010,14 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
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#endif
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/* write out the notes section */
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if (!write_note_info(&info, file, &foffset))
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if (!write_note_info(&info, cprm->file, &foffset))
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goto end_coredump;
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if (elf_coredump_extra_notes_write(file, &foffset))
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if (elf_coredump_extra_notes_write(cprm->file, &foffset))
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goto end_coredump;
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/* Align to page */
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if (!dump_seek(file, dataoff - foffset))
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if (!dump_seek(cprm->file, dataoff - foffset))
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goto end_coredump;
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for (vma = first_vma(current, gate_vma); vma != NULL;
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@ -2033,12 +2034,13 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
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page = get_dump_page(addr);
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if (page) {
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void *kaddr = kmap(page);
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stop = ((size += PAGE_SIZE) > limit) ||
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!dump_write(file, kaddr, PAGE_SIZE);
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stop = ((size += PAGE_SIZE) > cprm->limit) ||
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!dump_write(cprm->file, kaddr,
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PAGE_SIZE);
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kunmap(page);
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page_cache_release(page);
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} else
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stop = !dump_seek(file, PAGE_SIZE);
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stop = !dump_seek(cprm->file, PAGE_SIZE);
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if (stop)
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goto end_coredump;
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}
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@ -76,7 +76,7 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
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struct file *, struct mm_struct *);
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#ifdef CONFIG_ELF_CORE
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static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit);
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static int elf_fdpic_core_dump(struct coredump_params *cprm);
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#endif
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static struct linux_binfmt elf_fdpic_format = {
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@ -1327,7 +1327,8 @@ static int writenote(struct memelfnote *men, struct file *file)
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#undef DUMP_SEEK
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#define DUMP_WRITE(addr, nr) \
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if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
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if ((size += (nr)) > cprm->limit || \
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!dump_write(cprm->file, (addr), (nr))) \
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goto end_coredump;
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static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
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@ -1582,8 +1583,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
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* and then they are actually written out. If we run out of core limit
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* we just truncate.
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*/
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static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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struct file *file, unsigned long limit)
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static int elf_fdpic_core_dump(struct coredump_params *cprm)
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{
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#define NUM_NOTES 6
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int has_dumped = 0;
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@ -1642,7 +1642,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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goto cleanup;
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#endif
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if (signr) {
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if (cprm->signr) {
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struct core_thread *ct;
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struct elf_thread_status *tmp;
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@ -1661,14 +1661,14 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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int sz;
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tmp = list_entry(t, struct elf_thread_status, list);
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sz = elf_dump_thread_status(signr, tmp);
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sz = elf_dump_thread_status(cprm->signr, tmp);
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thread_status_size += sz;
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}
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}
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/* now collect the dump for the current */
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fill_prstatus(prstatus, current, signr);
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elf_core_copy_regs(&prstatus->pr_reg, regs);
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fill_prstatus(prstatus, current, cprm->signr);
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elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
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segs = current->mm->map_count;
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#ifdef ELF_CORE_EXTRA_PHDRS
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@ -1703,7 +1703,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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/* Try to dump the FPU. */
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if ((prstatus->pr_fpvalid =
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elf_core_copy_task_fpregs(current, regs, fpu)))
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elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
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fill_note(notes + numnote++,
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"CORE", NT_PRFPREG, sizeof(*fpu), fpu);
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#ifdef ELF_CORE_COPY_XFPREGS
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@ -1774,7 +1774,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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/* write out the notes section */
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for (i = 0; i < numnote; i++)
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if (!writenote(notes + i, file))
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if (!writenote(notes + i, cprm->file))
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goto end_coredump;
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/* write out the thread status notes section */
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@ -1783,14 +1783,15 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
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list_entry(t, struct elf_thread_status, list);
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for (i = 0; i < tmp->num_notes; i++)
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if (!writenote(&tmp->notes[i], file))
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if (!writenote(&tmp->notes[i], cprm->file))
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goto end_coredump;
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}
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if (!dump_seek(file, dataoff))
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if (!dump_seek(cprm->file, dataoff))
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goto end_coredump;
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if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0)
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if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,
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mm_flags) < 0)
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goto end_coredump;
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#ifdef ELF_CORE_WRITE_EXTRA_DATA
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@ -87,7 +87,7 @@ static int load_flat_shared_library(int id, struct lib_info *p);
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#endif
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static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs);
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static int flat_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
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static int flat_core_dump(struct coredump_params *cprm);
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static struct linux_binfmt flat_format = {
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.module = THIS_MODULE,
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@ -102,10 +102,10 @@ static struct linux_binfmt flat_format = {
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* Currently only a stub-function.
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*/
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static int flat_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
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static int flat_core_dump(struct coredump_params *cprm)
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{
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printk("Process %s:%d received signr %d and should have core dumped\n",
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current->comm, current->pid, (int) signr);
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current->comm, current->pid, (int) cprm->signr);
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return(1);
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}
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@ -43,7 +43,7 @@ static int load_som_library(struct file *);
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* don't even try.
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*/
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#if 0
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static int som_core_dump(long signr, struct pt_regs *regs, unsigned long limit);
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static int som_core_dump(struct coredump_params *cprm);
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#else
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#define som_core_dump NULL
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#endif
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38
fs/exec.c
38
fs/exec.c
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@ -1763,17 +1763,20 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
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struct mm_struct *mm = current->mm;
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struct linux_binfmt * binfmt;
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struct inode * inode;
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struct file * file;
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const struct cred *old_cred;
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struct cred *cred;
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int retval = 0;
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int flag = 0;
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int ispipe = 0;
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unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
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char **helper_argv = NULL;
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int helper_argc = 0;
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int dump_count = 0;
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static atomic_t core_dump_count = ATOMIC_INIT(0);
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struct coredump_params cprm = {
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.signr = signr,
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.regs = regs,
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.limit = current->signal->rlim[RLIMIT_CORE].rlim_cur,
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};
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audit_core_dumps(signr);
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@ -1829,15 +1832,15 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
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ispipe = format_corename(corename, signr);
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unlock_kernel();
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if ((!ispipe) && (core_limit < binfmt->min_coredump))
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if ((!ispipe) && (cprm.limit < binfmt->min_coredump))
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goto fail_unlock;
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if (ispipe) {
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if (core_limit == 0) {
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if (cprm.limit == 0) {
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/*
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* Normally core limits are irrelevant to pipes, since
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* we're not writing to the file system, but we use
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* core_limit of 0 here as a speacial value. Any
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* cprm.limit of 0 here as a speacial value. Any
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* non-zero limit gets set to RLIM_INFINITY below, but
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* a limit of 0 skips the dump. This is a consistent
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* way to catch recursive crashes. We can still crash
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@ -1870,25 +1873,25 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
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goto fail_dropcount;
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}
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core_limit = RLIM_INFINITY;
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cprm.limit = RLIM_INFINITY;
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/* SIGPIPE can happen, but it's just never processed */
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if (call_usermodehelper_pipe(helper_argv[0], helper_argv, NULL,
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&file)) {
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&cprm.file)) {
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printk(KERN_INFO "Core dump to %s pipe failed\n",
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corename);
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goto fail_dropcount;
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}
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} else
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file = filp_open(corename,
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cprm.file = filp_open(corename,
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O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
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0600);
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if (IS_ERR(file))
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if (IS_ERR(cprm.file))
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goto fail_dropcount;
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inode = file->f_path.dentry->d_inode;
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inode = cprm.file->f_path.dentry->d_inode;
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if (inode->i_nlink > 1)
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goto close_fail; /* multiple links - don't dump */
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if (!ispipe && d_unhashed(file->f_path.dentry))
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if (!ispipe && d_unhashed(cprm.file->f_path.dentry))
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goto close_fail;
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/* AK: actually i see no reason to not allow this for named pipes etc.,
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@ -1901,21 +1904,22 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
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*/
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if (inode->i_uid != current_fsuid())
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goto close_fail;
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if (!file->f_op)
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if (!cprm.file->f_op)
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goto close_fail;
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if (!file->f_op->write)
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if (!cprm.file->f_op->write)
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goto close_fail;
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if (!ispipe && do_truncate(file->f_path.dentry, 0, 0, file) != 0)
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if (!ispipe &&
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do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file) != 0)
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goto close_fail;
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retval = binfmt->core_dump(signr, regs, file, core_limit);
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retval = binfmt->core_dump(&cprm);
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if (retval)
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current->signal->group_exit_code |= 0x80;
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close_fail:
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if (ispipe && core_pipe_limit)
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wait_for_dump_helpers(file);
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filp_close(file, NULL);
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wait_for_dump_helpers(cprm.file);
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filp_close(cprm.file, NULL);
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fail_dropcount:
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if (dump_count)
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atomic_dec(&core_dump_count);
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@ -68,6 +68,14 @@ struct linux_binprm{
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#define BINPRM_MAX_RECURSION 4
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/* Function parameter for binfmt->coredump */
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struct coredump_params {
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long signr;
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struct pt_regs *regs;
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struct file *file;
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unsigned long limit;
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};
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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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@ -77,7 +85,7 @@ struct linux_binfmt {
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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, unsigned long limit);
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int (*core_dump)(struct coredump_params *cprm);
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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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