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    Subject[PATCH 4.9 31/72] parisc: Report SIGSEGV instead of SIGBUS when running out of stack
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Helge Deller <deller@gmx.de>

    commit 247462316f85a9e0479445c1a4223950b68ffac1 upstream.

    When a process runs out of stack the parisc kernel wrongly faults with SIGBUS
    instead of the expected SIGSEGV signal.

    This example shows how the kernel faults:
    do_page_fault() command='a.out' type=15 address=0xfaac2000 in libc-2.24.so[f8308000+16c000]
    trap #15: Data TLB miss fault, vm_start = 0xfa2c2000, vm_end = 0xfaac2000

    The vma->vm_end value is the first address which does not belong to the vma, so
    adjust the check to include vma->vm_end to the range for which to send the
    SIGSEGV signal.

    This patch unbreaks building the debian libsigsegv package.

    Signed-off-by: Helge Deller <deller@gmx.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/parisc/mm/fault.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/parisc/mm/fault.c
    +++ b/arch/parisc/mm/fault.c
    @@ -366,7 +366,7 @@ bad_area:
    case 15: /* Data TLB miss fault/Data page fault */
    /* send SIGSEGV when outside of vma */
    if (!vma ||
    - address < vma->vm_start || address > vma->vm_end) {
    + address < vma->vm_start || address >= vma->vm_end) {
    si.si_signo = SIGSEGV;
    si.si_code = SEGV_MAPERR;
    break;

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