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execve fix for v6.14-rc6

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- coredump: Only sort VMAs when core_sort_vma sysctl is set
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Merge tag 'execve-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull core dumping fix from Kees Cook:

 - Only sort VMAs when core_sort_vma sysctl is set

* tag 'execve-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  coredump: Only sort VMAs when core_sort_vma sysctl is set
This commit is contained in:
Linus Torvalds 2025-03-07 11:49:33 -10:00
commit dd047efbe0
2 changed files with 24 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

11
Documentation/admin-guide/sysctl/kernel.rst
View file

@ -212,6 +212,17 @@ pid>/``).
This value defaults to 0.
core_sort_vma
=============
The default coredump writes VMAs in address order. By setting
``core_sort_vma`` to 1, VMAs will be written from smallest size
to largest size. This is known to break at least elfutils, but
can be handy when dealing with very large (and truncated)
coredumps where the more useful debugging details are included
in the smaller VMAs.
core_uses_pid
=============

15
fs/coredump.c
View file

@ -63,6 +63,7 @@ static void free_vma_snapshot(struct coredump_params *cprm);
static int core_uses_pid;
static unsigned int core_pipe_limit;
static unsigned int core_sort_vma;
static char core_pattern[CORENAME_MAX_SIZE] = "core";
static int core_name_size = CORENAME_MAX_SIZE;
unsigned int core_file_note_size_limit = CORE_FILE_NOTE_SIZE_DEFAULT;
@ -1026,6 +1027,15 @@ static const struct ctl_table coredump_sysctls[] = {
.extra1 = (unsigned int *)&core_file_note_size_min,
.extra2 = (unsigned int *)&core_file_note_size_max,
},
{
.procname = "core_sort_vma",
.data = &core_sort_vma,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
};
static int __init init_fs_coredump_sysctls(void)
@ -1256,8 +1266,9 @@ static bool dump_vma_snapshot(struct coredump_params *cprm)
cprm->vma_data_size += m->dump_size;
}
sort(cprm->vma_meta, cprm->vma_count, sizeof(*cprm->vma_meta),
cmp_vma_size, NULL);
if (core_sort_vma)
sort(cprm->vma_meta, cprm->vma_count, sizeof(*cprm->vma_meta),
cmp_vma_size, NULL);
return true;
}