fs/binfmt_elf.c: coredump: allow process with empty address space to coredump

Unmapping whole address space at once with

	munmap(0, (1ULL<<47) - 4096)

or equivalent will create empty coredump.

It is silly way to exit, however registers content may still be useful.

The right to coredump is fundamental right of a process!

Link: http://lkml.kernel.org/r/20191222150137.GA1277@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
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 abd1070..f4713ea 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1595,6 +1595,10 @@ static int fill_files_note(struct memelfnote *note)
        if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
                return -EINVAL;
        size = round_up(size, PAGE_SIZE);
+       /*
+        * "size" can be 0 here legitimately.
+        * Let it ENOMEM and omit NT_FILE section which will be empty anyway.
+        */
        data = kvmalloc(size, GFP_KERNEL);
        if (ZERO_OR_NULL_PTR(data))
                return -ENOMEM;
@@ -2257,9 +2261,13 @@ static int elf_core_dump(struct coredump_params *cprm)
 
        dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
 
+       /*
+        * Zero vma process will get ZERO_SIZE_PTR here.
+        * Let coredump continue for register state at least.
+        */
        vma_filesz = kvmalloc(array_size(sizeof(*vma_filesz), (segs - 1)),
                              GFP_KERNEL);
-       if (ZERO_OR_NULL_PTR(vma_filesz))
+       if (!vma_filesz)
                goto end_coredump;
 
        for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;