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    powerpc: signals: Discard transaction state from signal frames · 78a3e888
    Cyril Bur authored
    
    
    Userspace can begin and suspend a transaction within the signal
    handler which means they might enter sys_rt_sigreturn() with the
    processor in suspended state.
    
    sys_rt_sigreturn() wants to restore process context (which may have
    been in a transaction before signal delivery). To do this it must
    restore TM SPRS. To achieve this, any transaction initiated within the
    signal frame must be discarded in order to be able to restore TM SPRs
    as TM SPRs can only be manipulated non-transactionally..
    >From the PowerPC ISA:
      TM Bad Thing Exception [Category: Transactional Memory]
       An attempt is made to execute a mtspr targeting a TM register in
       other than Non-transactional state.
    
    Not doing so results in a TM Bad Thing:
    [12045.221359] Kernel BUG at c000000000050a40 [verbose debug info unavailable]
    [12045.221470] Unexpected TM Bad Thing exception at c000000000050a40 (msr 0x201033)
    [12045.221540] Oops: Unrecoverable exception, sig: 6 [#1]
    [12045.221586] SMP NR_CPUS=2048 NUMA PowerNV
    [12045.221634] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE
     nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
     xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter
     ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables kvm_hv kvm
     uio_pdrv_genirq ipmi_powernv uio powernv_rng ipmi_msghandler autofs4 ses enclosure
     scsi_transport_sas bnx2x ipr mdio libcrc32c
    [12045.222167] CPU: 68 PID: 6178 Comm: sigreturnpanic Not tainted 4.7.0 #34
    [12045.222224] task: c0000000fce38600 ti: c0000000fceb4000 task.ti: c0000000fceb4000
    [12045.222293] NIP: c000000000050a40 LR: c0000000000163bc CTR: 0000000000000000
    [12045.222361] REGS: c0000000fceb7ac0 TRAP: 0700   Not tainted (4.7.0)
    [12045.222418] MSR: 9000000300201033 <SF,HV,ME,IR,DR,RI,LE,TM[SE]> CR: 28444280  XER: 20000000
    [12045.222625] CFAR: c0000000000163b8 SOFTE: 0 PACATMSCRATCH: 900000014280f033
    GPR00: 01100000b8000001 c0000000fceb7d40 c00000000139c100 c0000000fce390d0
    GPR04: 900000034280f033 0000000000000000 0000000000000000 0000000000000000
    GPR08: 0000000000000000 b000000000001033 0000000000000001 0000000000000000
    GPR12: 0000000000000000 c000000002926400 0000000000000000 0000000000000000
    GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    GPR24: 0000000000000000 00003ffff98cadd0 00003ffff98cb470 0000000000000000
    GPR28: 900000034280f033 c0000000fceb7ea0 0000000000000001 c0000000fce390d0
    [12045.223535] NIP [c000000000050a40] tm_restore_sprs+0xc/0x1c
    [12045.223584] LR [c0000000000163bc] tm_recheckpoint+0x5c/0xa0
    [12045.223630] Call Trace:
    [12045.223655] [c0000000fceb7d80] [c000000000026e74] sys_rt_sigreturn+0x494/0x6c0
    [12045.223738] [c0000000fceb7e30] [c0000000000092e0] system_call+0x38/0x108
    [12045.223806] Instruction dump:
    [12045.223841] 7c800164 4e800020 7c0022a6 f80304a8 7c0222a6 f80304b0 7c0122a6 f80304b8
    [12045.223955] 4e800020 e80304a8 7c0023a6 e80304b0 <7c0223a6> e80304b8 7c0123a6 4e800020
    [12045.224074] ---[ end trace cb8002ee240bae76 ]---
    
    It isn't clear exactly if there is really a use case for userspace
    returning with a suspended transaction, however, doing so doesn't (on
    its own) constitute a bad frame. As such, this patch simply discards
    the transactional state of the context calling the sigreturn and
    continues.
    
    Reported-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
    Signed-off-by: default avatarCyril Bur <cyrilbur@gmail.com>
    Tested-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
    Reviewed-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
    Acked-by: default avatarSimon Guo <wei.guo.simon@gmail.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    78a3e888