summaryrefslogtreecommitdiff
path: root/fs/binfmt_elf.c
diff options
context:
space:
mode:
authorEric W. Biederman <ebiederm@xmission.com>2018-09-25 11:27:20 +0200
committerEric W. Biederman <ebiederm@xmission.com>2018-10-03 16:47:43 +0200
commitae7795bc6187a15ec51cf258abae656a625f9980 (patch)
tree2456aa85c6b4be1ac58e272393056c0edbee038a /fs/binfmt_elf.c
parent4cd2e0e70af6897ca2247fa1ffb1553ca16b4903 (diff)
signal: Distinguish between kernel_siginfo and siginfo
Linus recently observed that if we did not worry about the padding member in struct siginfo it is only about 48 bytes, and 48 bytes is much nicer than 128 bytes for allocating on the stack and copying around in the kernel. The obvious thing of only adding the padding when userspace is including siginfo.h won't work as there are sigframe definitions in the kernel that embed struct siginfo. So split siginfo in two; kernel_siginfo and siginfo. Keeping the traditional name for the userspace definition. While the version that is used internally to the kernel and ultimately will not be padded to 128 bytes is called kernel_siginfo. The definition of struct kernel_siginfo I have put in include/signal_types.h A set of buildtime checks has been added to verify the two structures have the same field offsets. To make it easy to verify the change kernel_siginfo retains the same size as siginfo. The reduction in size comes in a following change. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index efae2fb0930a..54207327f98f 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1580,7 +1580,7 @@ static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
}
static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
- const siginfo_t *siginfo)
+ const kernel_siginfo_t *siginfo)
{
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
@@ -1782,7 +1782,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
static int fill_note_info(struct elfhdr *elf, int phdrs,
struct elf_note_info *info,
- const siginfo_t *siginfo, struct pt_regs *regs)
+ const kernel_siginfo_t *siginfo, struct pt_regs *regs)
{
struct task_struct *dump_task = current;
const struct user_regset_view *view = task_user_regset_view(dump_task);
@@ -2031,7 +2031,7 @@ static int elf_note_info_init(struct elf_note_info *info)
static int fill_note_info(struct elfhdr *elf, int phdrs,
struct elf_note_info *info,
- const siginfo_t *siginfo, struct pt_regs *regs)
+ const kernel_siginfo_t *siginfo, struct pt_regs *regs)
{
struct list_head *t;
struct core_thread *ct;