diff options
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 81878b78c9d..504b6eee50a 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1093,6 +1093,29 @@ out: */ /* + * The purpose of always_dump_vma() is to make sure that special kernel mappings + * that are useful for post-mortem analysis are included in every core dump. + * In that way we ensure that the core dump is fully interpretable later + * without matching up the same kernel and hardware config to see what PC values + * meant. These special mappings include - vDSO, vsyscall, and other + * architecture specific mappings + */ +static bool always_dump_vma(struct vm_area_struct *vma) +{ + /* Any vsyscall mappings? */ + if (vma == get_gate_vma(vma->vm_mm)) + return true; + /* + * arch_vma_name() returns non-NULL for special architecture mappings, + * such as vDSO sections. + */ + if (arch_vma_name(vma)) + return true; + + return false; +} + +/* * Decide what to dump of a segment, part, all or none. */ static unsigned long vma_dump_size(struct vm_area_struct *vma, @@ -1100,10 +1123,13 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma, { #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) - /* The vma can be set up to tell us the answer directly. */ - if (vma->vm_flags & VM_ALWAYSDUMP) + /* always dump the vdso and vsyscall sections */ + if (always_dump_vma(vma)) goto whole; + if (vma->vm_flags & VM_NODUMP) + return 0; + /* Hugetlb memory check */ if (vma->vm_flags & VM_HUGETLB) { if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) |