fs/binfmt_elf.c: prevent a coredump with a large vm_map_count from Oopsing

A high setting of max_map_count, and a process core-dumping with a large
enough vm_map_count could result in an NT_FILE note not being written,
and the kernel crashing immediately later because it has assumed
otherwise.

Reproduction of the oops-causing bug described here:

    https://lkml.org/lkml/2013/8/30/50

Rge ussue originated in commit 2aa362c49c31 ("coredump: extend core dump
note section to contain file names of mapped file") from Oct 4, 2012.

This patch make that section optional in that case.  fill_files_note()
should signify the error, and also let the info struct in
elf_core_dump() be zero-initialized so that we can check for the
optionally written note.

[akpm@linux-foundation.org: avoid abusing E2BIG, remove a couple of not-really-needed local variables]
[akpm@linux-foundation.org: fix sparse warning]
Signed-off-by: Dan Aloni <alonid@stratoscale.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Reported-by: Martin MOKREJS <mmokrejs@gmail.com>
Tested-by: Martin MOKREJS <mmokrejs@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 100edcc..4c94a79 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1413,7 +1413,7 @@ static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
  *   long file_ofs
  * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
  */
-static void fill_files_note(struct memelfnote *note)
+static int fill_files_note(struct memelfnote *note)
 {
        struct vm_area_struct *vma;
        unsigned count, size, names_ofs, remaining, n;
@@ -1428,11 +1428,11 @@ static void fill_files_note(struct memelfnote *note)
        names_ofs = (2 + 3 * count) * sizeof(data[0]);
  alloc:
        if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
-               goto err;
+               return -EINVAL;
        size = round_up(size, PAGE_SIZE);
        data = vmalloc(size);
        if (!data)
-               goto err;
+               return -ENOMEM;
 
        start_end_ofs = data + 2;
        name_base = name_curpos = ((char *)data) + names_ofs;
@@ -1485,7 +1485,7 @@ static void fill_files_note(struct memelfnote *note)
 
        size = name_curpos - (char *)data;
        fill_note(note, "CORE", NT_FILE, size, data);
- err: ;
+       return 0;
 }
 
 #ifdef CORE_DUMP_USE_REGSET
@@ -1686,8 +1686,8 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
        fill_auxv_note(&info->auxv, current->mm);
        info->size += notesize(&info->auxv);
 
-       fill_files_note(&info->files);
-       info->size += notesize(&info->files);
+       if (fill_files_note(&info->files) == 0)
+               info->size += notesize(&info->files);
 
        return 1;
 }
@@ -1719,7 +1719,8 @@ static int write_note_info(struct elf_note_info *info,
                        return 0;
                if (first && !writenote(&info->auxv, file, foffset))
                        return 0;
-               if (first && !writenote(&info->files, file, foffset))
+               if (first && info->files.data &&
+                               !writenote(&info->files, file, foffset))
                        return 0;
 
                for (i = 1; i < info->thread_notes; ++i)
@@ -1806,6 +1807,7 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
 
 struct elf_note_info {
        struct memelfnote *notes;
+       struct memelfnote *notes_files;
        struct elf_prstatus *prstatus;  /* NT_PRSTATUS */
        struct elf_prpsinfo *psinfo;    /* NT_PRPSINFO */
        struct list_head thread_list;
@@ -1896,9 +1898,12 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 
        fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
        fill_auxv_note(info->notes + 3, current->mm);
-       fill_files_note(info->notes + 4);
+       info->numnote = 4;
 
-       info->numnote = 5;
+       if (fill_files_note(info->notes + info->numnote) == 0) {
+               info->notes_files = info->notes + info->numnote;
+               info->numnote++;
+       }
 
        /* Try to dump the FPU. */
        info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
@@ -1960,8 +1965,9 @@ static void free_note_info(struct elf_note_info *info)
                kfree(list_entry(tmp, struct elf_thread_status, list));
        }
 
-       /* Free data allocated by fill_files_note(): */
-       vfree(info->notes[4].data);
+       /* Free data possibly allocated by fill_files_note(): */
+       if (info->notes_files)
+               vfree(info->notes_files->data);
 
        kfree(info->prstatus);
        kfree(info->psinfo);
@@ -2044,7 +2050,7 @@ static int elf_core_dump(struct coredump_params *cprm)
        struct vm_area_struct *vma, *gate_vma;
        struct elfhdr *elf = NULL;
        loff_t offset = 0, dataoff, foffset;
-       struct elf_note_info info;
+       struct elf_note_info info = { };
        struct elf_phdr *phdr4note = NULL;
        struct elf_shdr *shdr4extnum = NULL;
        Elf_Half e_phnum;