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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2015-10-05 16:33:36 -0600 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-11-09 13:29:54 -0500 |
| commit | 5037835c1f3eabf4f22163fc0278dd87165f8957 (patch) | |
| tree | 6cfa915dabfa9512ade4d974eb36635293c02447 /fs/binfmt_elf.c | |
| parent | 85ce230051c37dfb979385eb0244bf3655625ba6 (diff) | |
| download | lwn-5037835c1f3eabf4f22163fc0278dd87165f8957.tar.gz lwn-5037835c1f3eabf4f22163fc0278dd87165f8957.zip | |
coredump: add DAX filtering for ELF coredumps
Add two new flags to the existing coredump mechanism for ELF files to
allow us to explicitly filter DAX mappings. This is desirable because
DAX mappings, like hugetlb mappings, have the potential to be very
large.
Update the coredump_filter documentation in
Documentation/filesystems/proc.txt so that it addresses the new DAX
coredump flags. Also update the documented default value of
coredump_filter to be consistent with the core(5) man page. The
documentation being updated talks about bit 4, Dump ELF headers, which
is enabled if CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is turned on in the
kernel config. This kernel config option defaults to "y" if both ELF
binaries and coredump are enabled.
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>
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 6b659967898e..5f399ea1d20a 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -35,6 +35,7 @@ #include <linux/utsname.h> #include <linux/coredump.h> #include <linux/sched.h> +#include <linux/dax.h> #include <asm/uaccess.h> #include <asm/param.h> #include <asm/page.h> @@ -1236,6 +1237,15 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma, if (vma->vm_flags & VM_DONTDUMP) return 0; + /* support for DAX */ + if (vma_is_dax(vma)) { + if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) + goto whole; + if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) + goto whole; + return 0; + } + /* Hugetlb memory check */ if (vma->vm_flags & VM_HUGETLB) { if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) |