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coredump: add DAX filtering for FDPIC ELF coredumps 

Add explicit filtering for DAX mappings to FDPIC ELF coredump.  This is
useful because DAX mappings have the potential to be very large.

This patch has only been compile tested.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
hifive-unleashed-5.1
Ross Zwisler 2015-10-05 16:33:37 -06:00 committed by Dan Williams
parent 5037835c1f
commit ab27a8d04b
1 changed files with 15 additions and 0 deletions
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15
fs/binfmt_elf_fdpic.c
View File

@ -35,6 +35,7 @@
#include <linux/elf-fdpic.h>
#include <linux/elfcore.h>
#include <linux/coredump.h>
#include <linux/dax.h>
#include <asm/uaccess.h>
#include <asm/param.h>
@ -1206,6 +1207,20 @@ static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
return 0;
}
/* support for DAX */
if (vma_is_dax(vma)) {
if (vma->vm_flags & VM_SHARED) {
dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags);
kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start,
vma->vm_flags, dump_ok ? "yes" : "no");
} else {
dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags);
kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start,
vma->vm_flags, dump_ok ? "yes" : "no");
}
return dump_ok;
}
/* By default, dump shared memory if mapped from an anonymous file. */
if (vma->vm_flags & VM_SHARED) {
if (file_inode(vma->vm_file)->i_nlink == 0) {