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    Subject[PATCH 4.9 17/69] x86/signals: Fix lower/upper bound reporting in compat siginfo
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

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

    From: Joerg Roedel <jroedel@suse.de>

    commit cfac6dfa42bddfa9711b20d486e521d1a41ab09f upstream.

    Put the right values from the original siginfo into the
    userspace compat-siginfo.

    This fixes the 32-bit MPX "tabletest" testcase on 64-bit kernels.

    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Dmitry Safonov <0x7f454c46@gmail.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Fixes: a4455082dc6f0 ('x86/signals: Add missing signal_compat code for x86 features')
    Link: http://lkml.kernel.org/r/1491322501-5054-1-git-send-email-joro@8bytes.org
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/x86/kernel/signal_compat.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/x86/kernel/signal_compat.c
    +++ b/arch/x86/kernel/signal_compat.c
    @@ -151,8 +151,8 @@ int __copy_siginfo_to_user32(compat_sigi

    if (from->si_signo == SIGSEGV) {
    if (from->si_code == SEGV_BNDERR) {
    - compat_uptr_t lower = (unsigned long)&to->si_lower;
    - compat_uptr_t upper = (unsigned long)&to->si_upper;
    + compat_uptr_t lower = (unsigned long)from->si_lower;
    + compat_uptr_t upper = (unsigned long)from->si_upper;
    put_user_ex(lower, &to->si_lower);
    put_user_ex(upper, &to->si_upper);
    }

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