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    Subject[PATCH 4.19 135/170] powerpc/tm: Unset MSR[TS] if not recheckpointing
    Date
    4.19-stable review patch.  If anyone has any objections, please let me know.

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

    From: Breno Leitao <leitao@debian.org>

    commit 6f5b9f018f4c7686fd944d920209d1382d320e4e upstream.

    There is a TM Bad Thing bug that can be caused when you return from a
    signal context in a suspended transaction but with ucontext MSR[TS] unset.

    This forces regs->msr[TS] to be set at syscall entrance (since the CPU
    state is transactional). It also calls treclaim() to flush the transaction
    state, which is done based on the live (mfmsr) MSR state.

    Since user context MSR[TS] is not set, then restore_tm_sigcontexts() is not
    called, thus, not executing recheckpoint, keeping the CPU state as not
    transactional. When calling rfid, SRR1 will have MSR[TS] set, but the CPU
    state is non transactional, causing the TM Bad Thing with the following
    stack:

    [ 33.862316] Bad kernel stack pointer 3fffd9dce3e0 at c00000000000c47c
    cpu 0x8: Vector: 700 (Program Check) at [c00000003ff7fd40]
    pc: c00000000000c47c: fast_exception_return+0xac/0xb4
    lr: 00003fff865f442c
    sp: 3fffd9dce3e0
    msr: 8000000102a03031
    current = 0xc00000041f68b700
    paca = 0xc00000000fb84800 softe: 0 irq_happened: 0x01
    pid = 1721, comm = tm-signal-sigre
    Linux version 4.9.0-3-powerpc64le (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18) ) #1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26)
    WARNING: exception is not recoverable, can't continue

    The same problem happens on 32-bits signal handler, and the fix is very
    similar, if tm_recheckpoint() is not executed, then regs->msr[TS] should be
    zeroed.

    This patch also fixes a sparse warning related to lack of indentation when
    CONFIG_PPC_TRANSACTIONAL_MEM is set.

    Fixes: 2b0a576d15e0e ("powerpc: Add new transactional memory state to the signal context")
    CC: Stable <stable@vger.kernel.org> # 3.10+
    Signed-off-by: Breno Leitao <leitao@debian.org>
    Tested-by: Michal Suchánek <msuchanek@suse.de>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/kernel/signal_32.c | 18 +++++++++++++-----
    arch/powerpc/kernel/signal_64.c | 20 ++++++++++++++++----
    2 files changed, 29 insertions(+), 9 deletions(-)

    --- a/arch/powerpc/kernel/signal_32.c
    +++ b/arch/powerpc/kernel/signal_32.c
    @@ -1158,11 +1158,11 @@ SYSCALL_DEFINE0(rt_sigreturn)
    {
    struct rt_sigframe __user *rt_sf;
    struct pt_regs *regs = current_pt_regs();
    + int tm_restore = 0;
    #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
    struct ucontext __user *uc_transact;
    unsigned long msr_hi;
    unsigned long tmp;
    - int tm_restore = 0;
    #endif
    /* Always make any pending restarted system calls return -EINTR */
    current->restart_block.fn = do_no_restart_syscall;
    @@ -1210,11 +1210,19 @@ SYSCALL_DEFINE0(rt_sigreturn)
    goto bad;
    }
    }
    - if (!tm_restore)
    - /* Fall through, for non-TM restore */
    + if (!tm_restore) {
    + /*
    + * Unset regs->msr because ucontext MSR TS is not
    + * set, and recheckpoint was not called. This avoid
    + * hitting a TM Bad thing at RFID
    + */
    + regs->msr &= ~MSR_TS_MASK;
    + }
    + /* Fall through, for non-TM restore */
    #endif
    - if (do_setcontext(&rt_sf->uc, regs, 1))
    - goto bad;
    + if (!tm_restore)
    + if (do_setcontext(&rt_sf->uc, regs, 1))
    + goto bad;

    /*
    * It's not clear whether or why it is desirable to save the
    --- a/arch/powerpc/kernel/signal_64.c
    +++ b/arch/powerpc/kernel/signal_64.c
    @@ -756,11 +756,23 @@ SYSCALL_DEFINE0(rt_sigreturn)
    &uc_transact->uc_mcontext))
    goto badframe;
    }
    - else
    - /* Fall through, for non-TM restore */
    #endif
    - if (restore_sigcontext(current, NULL, 1, &uc->uc_mcontext))
    - goto badframe;
    + /* Fall through, for non-TM restore */
    + if (!MSR_TM_ACTIVE(msr)) {
    + /*
    + * Unset MSR[TS] on the thread regs since MSR from user
    + * context does not have MSR active, and recheckpoint was
    + * not called since restore_tm_sigcontexts() was not called
    + * also.
    + *
    + * If not unsetting it, the code can RFID to userspace with
    + * MSR[TS] set, but without CPU in the proper state,
    + * causing a TM bad thing.
    + */
    + current->thread.regs->msr &= ~MSR_TS_MASK;
    + if (restore_sigcontext(current, NULL, 1, &uc->uc_mcontext))
    + goto badframe;
    + }

    if (restore_altstack(&uc->uc_stack))
    goto badframe;

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