forked from mirrors/linux
coredump: extend core dump note section to contain file names of mapped files
This note has the following format: long count -- how many files are mapped long page_size -- units for file_ofs array of [COUNT] elements of long start long end long file_ofs followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Denys Vlasenko
Linus Torvalds
parent
49ae4d4b11
commit
2aa362c49c
3 changed files with 108 additions and 4 deletions
110
fs/binfmt_elf.c
110
fs/binfmt_elf.c
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@ -27,6 +27,7 @@
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#include <linux/compiler.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/vmalloc.h>
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#include <linux/security.h>
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#include <linux/random.h>
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#include <linux/elf.h>
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@ -37,6 +38,9 @@
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#include <asm/page.h>
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#include <asm/exec.h>
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#ifndef user_long_t
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#define user_long_t long
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#endif
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#ifndef user_siginfo_t
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#define user_siginfo_t siginfo_t
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#endif
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@ -1386,6 +1390,93 @@ static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
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fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
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}
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#define MAX_FILE_NOTE_SIZE (4*1024*1024)
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/*
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* Format of NT_FILE note:
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*
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* long count -- how many files are mapped
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* long page_size -- units for file_ofs
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* array of [COUNT] elements of
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* long start
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* long end
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* long file_ofs
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* followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
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*/
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static void fill_files_note(struct memelfnote *note)
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{
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struct vm_area_struct *vma;
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unsigned count, size, names_ofs, remaining, n;
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user_long_t *data;
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user_long_t *start_end_ofs;
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char *name_base, *name_curpos;
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/* *Estimated* file count and total data size needed */
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count = current->mm->map_count;
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size = count * 64;
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names_ofs = (2 + 3 * count) * sizeof(data[0]);
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alloc:
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if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
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goto err;
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size = round_up(size, PAGE_SIZE);
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data = vmalloc(size);
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if (!data)
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goto err;
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start_end_ofs = data + 2;
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name_base = name_curpos = ((char *)data) + names_ofs;
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remaining = size - names_ofs;
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count = 0;
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for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
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struct file *file;
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const char *filename;
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file = vma->vm_file;
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if (!file)
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continue;
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filename = d_path(&file->f_path, name_curpos, remaining);
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if (IS_ERR(filename)) {
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if (PTR_ERR(filename) == -ENAMETOOLONG) {
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vfree(data);
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size = size * 5 / 4;
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goto alloc;
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}
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continue;
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}
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/* d_path() fills at the end, move name down */
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/* n = strlen(filename) + 1: */
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n = (name_curpos + remaining) - filename;
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remaining = filename - name_curpos;
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memmove(name_curpos, filename, n);
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name_curpos += n;
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*start_end_ofs++ = vma->vm_start;
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*start_end_ofs++ = vma->vm_end;
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*start_end_ofs++ = vma->vm_pgoff;
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count++;
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}
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/* Now we know exact count of files, can store it */
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data[0] = count;
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data[1] = PAGE_SIZE;
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/*
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* Count usually is less than current->mm->map_count,
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* we need to move filenames down.
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*/
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n = current->mm->map_count - count;
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if (n != 0) {
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unsigned shift_bytes = n * 3 * sizeof(data[0]);
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memmove(name_base - shift_bytes, name_base,
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name_curpos - name_base);
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name_curpos -= shift_bytes;
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}
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size = name_curpos - (char *)data;
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fill_note(note, "CORE", NT_FILE, size, data);
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err: ;
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}
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#ifdef CORE_DUMP_USE_REGSET
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#include <linux/regset.h>
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@ -1401,6 +1492,7 @@ struct elf_note_info {
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struct memelfnote psinfo;
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struct memelfnote signote;
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struct memelfnote auxv;
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struct memelfnote files;
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user_siginfo_t csigdata;
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size_t size;
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int thread_notes;
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@ -1581,6 +1673,9 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
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fill_auxv_note(&info->auxv, current->mm);
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info->size += notesize(&info->auxv);
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fill_files_note(&info->files);
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info->size += notesize(&info->files);
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return 1;
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}
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@ -1611,6 +1706,8 @@ static int write_note_info(struct elf_note_info *info,
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return 0;
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if (first && !writenote(&info->auxv, file, foffset))
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return 0;
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if (first && !writenote(&info->files, file, foffset))
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return 0;
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for (i = 1; i < info->thread_notes; ++i)
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if (t->notes[i].data &&
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@ -1637,6 +1734,7 @@ static void free_note_info(struct elf_note_info *info)
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kfree(t);
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}
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kfree(info->psinfo.data);
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vfree(info->files.data);
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}
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#else
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@ -1713,7 +1811,7 @@ static int elf_note_info_init(struct elf_note_info *info)
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INIT_LIST_HEAD(&info->thread_list);
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/* Allocate space for ELF notes */
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info->notes = kmalloc(7 * sizeof(struct memelfnote), GFP_KERNEL);
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info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
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if (!info->notes)
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return 0;
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info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
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@ -1783,10 +1881,11 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
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fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
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sizeof(*info->psinfo), info->psinfo);
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info->numnote = 2;
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fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
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fill_auxv_note(info->notes + 3, current->mm);
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fill_files_note(info->notes + 4);
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fill_siginfo_note(&info->notes[info->numnote++], &info->csigdata, siginfo);
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fill_auxv_note(&info->notes[info->numnote++], current->mm);
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info->numnote = 5;
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/* Try to dump the FPU. */
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info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
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@ -1848,6 +1947,9 @@ static void free_note_info(struct elf_note_info *info)
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kfree(list_entry(tmp, struct elf_thread_status, list));
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}
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/* Free data allocated by fill_files_note(): */
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vfree(info->notes[4].data);
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kfree(info->prstatus);
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kfree(info->psinfo);
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kfree(info->notes);
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@ -40,6 +40,7 @@
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/*
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* Some data types as stored in coredump.
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*/
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#define user_long_t compat_long_t
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#define user_siginfo_t compat_siginfo_t
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#define copy_siginfo_to_user copy_siginfo_to_user32
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@ -377,6 +377,7 @@ typedef struct elf64_shdr {
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* in the future to accomodate more fields, don't assume it is fixed!
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*/
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#define NT_SIGINFO 0x53494749
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#define NT_FILE 0x46494c45
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#define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */
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#define NT_PPC_VMX 0x100 /* PowerPC Altivec/VMX registers */
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#define NT_PPC_SPE 0x101 /* PowerPC SPE/EVR registers */
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