[PATCH -mm 3/3 v2] ELF, coredump: allow process with empty address space to coredump

[Alexey Dobriyan <adobriyan@gmail.com>]

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!

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 fs/binfmt_elf.c                                  |   10 +++++-
 tools/testing/selftests/exec/Makefile            |    1 
 tools/testing/selftests/exec/coredump-zero-vma.c |   38 +++++++++++++++++++++++
 3 files changed, 48 insertions(+), 1 deletion(-)

--- 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;