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    Subject[PATCH 13/30] elf: Allow core dump-related fields to be overridden
    Date
    From: "H. J. Lu" <hjl.tools@gmail.com>

    Allow some core dump-related fields to be overridden. This allows
    core dumps to work correctly for x32.

    Signed-off-by: H. Peter Anvin <hpa@zytor.com>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Roland McGrath <roland@redhat.com>
    Cc: Oleg Nesterov <oleg@redhat.com>
    ---
    fs/binfmt_elf.c | 24 ++++++++++++++++++++----
    1 files changed, 20 insertions(+), 4 deletions(-)

    diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
    index bcb884e..43ba478 100644
    --- a/fs/binfmt_elf.c
    +++ b/fs/binfmt_elf.c
    @@ -1390,6 +1390,22 @@ static void do_thread_regset_writeback(struct task_struct *task,
    regset->writeback(task, regset, 1);
    }

    +#ifndef PR_REG_SIZE
    +#define PR_REG_SIZE(S) sizeof(S)
    +#endif
    +
    +#ifndef PRSTATUS_SIZE
    +#define PRSTATUS_SIZE(S) sizeof(S)
    +#endif
    +
    +#ifndef PR_REG_PTR
    +#define PR_REG_PTR(S) (&((S)->pr_reg))
    +#endif
    +
    +#ifndef SET_PR_FPVALID
    +#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
    +#endif
    +
    static int fill_thread_core_info(struct elf_thread_core_info *t,
    const struct user_regset_view *view,
    long signr, size_t *total)
    @@ -1404,11 +1420,11 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
    */
    fill_prstatus(&t->prstatus, t->task, signr);
    (void) view->regsets[0].get(t->task, &view->regsets[0],
    - 0, sizeof(t->prstatus.pr_reg),
    - &t->prstatus.pr_reg, NULL);
    + 0, PR_REG_SIZE(t->prstatus.pr_reg),
    + PR_REG_PTR(&t->prstatus), NULL);

    fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
    - sizeof(t->prstatus), &t->prstatus);
    + PRSTATUS_SIZE(t->prstatus), &t->prstatus);
    *total += notesize(&t->notes[0]);

    do_thread_regset_writeback(t->task, &view->regsets[0]);
    @@ -1438,7 +1454,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
    regset->core_note_type,
    size, data);
    else {
    - t->prstatus.pr_fpvalid = 1;
    + SET_PR_FPVALID(&t->prstatus, 1);
    fill_note(&t->notes[i], "CORE",
    NT_PRFPREG, size, data);
    }
    --
    1.7.6.5


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