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authorAlexey Dobriyan <adobriyan@gmail.com>2020-01-31 09:17:10 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 21:30:41 +0300
commit1fbede6e6f3dc6c1c33e84b6989cf8079d899f89 (patch)
treec4e0165c20f9367545ec7eba2707c56df5d81d98 /fs/binfmt_elf.c
parent28f46656ad18534f4488590b5447ec48b954420d (diff)
downloadlinux-1fbede6e6f3dc6c1c33e84b6989cf8079d899f89.tar.xz
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>
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index abd10707826a..f4713ea76e82 100644
--- 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;