1. 30 Aug, 2017 1 commit
    • Josh Poimboeuf's avatar
      objtool: Handle GCC stack pointer adjustment bug · dd88a0a0
      Josh Poimboeuf authored
      Arnd Bergmann reported the following warning with GCC 7.1.1:
      
        fs/fs_pin.o: warning: objtool: pin_kill()+0x139: stack state mismatch: cfa1=7+88 cfa2=7+96
      
      And the kbuild robot reported the following warnings with GCC 5.4.1:
      
        fs/fs_pin.o: warning: objtool: pin_kill()+0x182: return with modified stack frame
        fs/quota/dquot.o: warning: objtool: dquot_alloc_inode()+0x140: stack state mismatch: cfa1=7+120 cfa2=7+128
        fs/quota/dquot.o: warning: objtool: dquot_free_inode()+0x11a: stack state mismatch: cfa1=7+112 cfa2=7+120
      
      Those warnings are caused by an unusual GCC non-optimization where it
      uses an intermediate register to adjust the stack pointer.  It does:
      
        lea    0x8(%rsp), %rcx
        ...
        mov    %rcx, %rsp
      
      Instead of the obvious:
      
        add    $0x8, %rsp
      
      It makes no sense to use an intermediate register, so I opened a GCC bug
      to track it:
      
        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81813
      
      But it's not exactly a high-priority bug and it looks like we'll be
      stuck with this issue for a while.  So for now we have to track register
      values when they're loaded with stack pointer offsets.
      
      This is kind of a big workaround for a tiny problem, but c'est la vie.
      I hope to eventually create a GCC plugin to implement a big chunk of
      objtool's functionality.  Hopefully at that point we'll be able to
      remove of a lot of these GCC-isms from the objtool code.
      Reported-by: default avatarArnd Bergmann <arnd@arndb.de>
      Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
      Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/6a41a96884c725e7f05413bb7df40cfe824b2444.1504028945.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      dd88a0a0
  2. 29 Aug, 2017 4 commits
    • Jiri Slaby's avatar
      x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for stub32_clone() · 49993489
      Jiri Slaby authored
      ALIGN+GLOBAL is effectively what ENTRY() does, so use ENTRY() which is
      dedicated for exactly this purpose -- global functions.
      
      Note that stub32_clone() is a C-like leaf function -- it has a standard
      call frame -- it only switches one argument and continues by jumping
      into C. Since each ENTRY() should be balanced by some END*() marker, we
      add a corresponding ENDPROC() to stub32_clone() too.
      
      Besides that, x86's custom GLOBAL macro is going to die very soon.
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.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>
      Link: http://lkml.kernel.org/r/20170824080624.7768-2-jslaby@suse.czSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      49993489
    • Jiri Slaby's avatar
      x86/fpu/math-emu: Add ENDPROC to functions · bd6be579
      Jiri Slaby authored
      Functions in math-emu are annotated as ENTRY() symbols, but their
      ends are not annotated at all. But these are standard functions
      called from C, with proper stack register update etc.
      
      Omitting the ends means:
      
        * the annotations are not paired and we cannot deal with such functions
          e.g. in objtool
      
        * the symbols are not marked as functions in the object file
      
        * there are no sizes of the functions in the object file
      
      So fix this by adding ENDPROC() to each such case in math-emu.
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.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>
      Link: http://lkml.kernel.org/r/20170824080624.7768-1-jslaby@suse.czSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      bd6be579
    • Jiri Slaby's avatar
      x86/boot/64: Extract efi_pe_entry() from startup_64() · 9e085cef
      Jiri Slaby authored
      Similarly to the 32-bit code, efi_pe_entry body() is somehow squashed into
      startup_64().
      
      In the old days, we forced startup_64() to start at offset 0x200 and efi_pe_entry()
      to start at 0x210. But this requirement was removed long time ago, in:
      
        99f857db ("x86, build: Dynamically find entry points in compressed startup code")
      
      The way it is now makes the code less readable and illogical. Given
      we can now safely extract the inlined efi_pe_entry() body from
      startup_64() into a separate function, we do so.
      
      We also annotate the function appropriatelly by ENTRY+ENDPROC.
      
      ABI offsets are preserved:
      
        0000000000000000 T startup_32
        0000000000000200 T startup_64
        0000000000000390 T efi64_stub_entry
      
      On the top-level, it looked like:
      
      	.org 0x200
      	ENTRY(startup_64)
      	#ifdef CONFIG_EFI_STUB		; start of inlined
      		jmp     preferred_addr
      	GLOBAL(efi_pe_entry)
      		... ; a lot of assembly (efi_pe_entry)
      		leaq    preferred_addr(%rax), %rax
      		jmp     *%rax
      	preferred_addr:
      	#endif				; end of inlined
      		... ; a lot of assembly (startup_64)
      	ENDPROC(startup_64)
      
      And it is now converted into:
      
      	.org 0x200
      	ENTRY(startup_64)
      		... ; a lot of assembly (startup_64)
      	ENDPROC(startup_64)
      
      	#ifdef CONFIG_EFI_STUB
      	ENTRY(efi_pe_entry)
      		... ; a lot of assembly (efi_pe_entry)
      		leaq    startup_64(%rax), %rax
      		jmp     *%rax
      	ENDPROC(efi_pe_entry)
      	#endif
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: ard.biesheuvel@linaro.org
      Cc: linux-efi@vger.kernel.org
      Link: http://lkml.kernel.org/r/20170824073327.4129-2-jslaby@suse.czSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9e085cef
    • Jiri Slaby's avatar
      x86/boot/32: Extract efi_pe_entry() from startup_32() · f4dee0bb
      Jiri Slaby authored
      The efi_pe_entry() body is somehow squashed into startup_32(). In the old days,
      we forced startup_32() to start at offset 0x00 and efi_pe_entry() to start
      at 0x10.
      
      But this requirement was removed long time ago, in:
      
        99f857db ("x86, build: Dynamically find entry points in compressed startup code")
      
      The way it is now makes the code less readable and illogical. Given
      we can now safely extract the inlined efi_pe_entry() body from
      startup_32() into a separate function, we do so and we separate it to two
      functions as they are marked already: efi_pe_entry() + efi32_stub_entry().
      
      We also annotate the functions appropriatelly by ENTRY+ENDPROC.
      
      ABI offset is preserved:
      
        0000   128 FUNC    GLOBAL DEFAULT    6 startup_32
        0080    60 FUNC    GLOBAL DEFAULT    6 efi_pe_entry
        00bc    68 FUNC    GLOBAL DEFAULT    6 efi32_stub_entry
      
      On the top-level, it looked like this:
      
      	ENTRY(startup_32)
      	#ifdef CONFIG_EFI_STUB		; start of inlined
      		jmp     preferred_addr
      	ENTRY(efi_pe_entry)
      		... ; a lot of assembly (efi_pe_entry)
      	ENTRY(efi32_stub_entry)
      		... ; a lot of assembly (efi32_stub_entry)
      		leal    preferred_addr(%eax), %eax
      		jmp     *%eax
      	preferred_addr:
      	#endif				; end of inlined
      		... ; a lot of assembly (startup_32)
      	ENDPROC(startup_32)
      
      And it is now converted into:
      
      	ENTRY(startup_32)
      		... ; a lot of assembly (startup_32)
      	ENDPROC(startup_32)
      
      	#ifdef CONFIG_EFI_STUB
      	ENTRY(efi_pe_entry)
      		... ; a lot of assembly (efi_pe_entry)
      	ENDPROC(efi_pe_entry)
      
      	ENTRY(efi32_stub_entry)
      		... ; a lot of assembly (efi32_stub_entry)
      		leal    startup_32(%eax), %eax
      		jmp     *%eax
      	ENDPROC(efi32_stub_entry)
      	#endif
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: ard.biesheuvel@linaro.org
      Cc: linux-efi@vger.kernel.org
      Link: http://lkml.kernel.org/r/20170824073327.4129-1-jslaby@suse.czSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f4dee0bb
  3. 24 Aug, 2017 2 commits
  4. 21 Aug, 2017 1 commit
    • Josh Poimboeuf's avatar
      objtool: Fix objtool fallthrough detection with function padding · ee97638b
      Josh Poimboeuf authored
      When GCC adds NOP padding between functions, those NOPs aren't
      associated with a function symbol, which breaks objtool's detection of a
      function falling through to another function.  Instead it shows
      confusing errors like:
      
        drivers/mtd/chips/cfi_util.o: warning: objtool: cfi_qry_mode_on()+0x8b: return with modified stack frame
        drivers/mtd/chips/cfi_util.o: warning: objtool: cfi_qry_mode_on()+0x0: stack state mismatch: cfa1=-4-32 cfa2=7+8
        drivers/mtd/chips/cfi_cmdset_0002.o: warning: objtool: fixup_use_fwh_lock()+0x8: unknown stack-related register move
        drivers/mtd/chips/cfi_cmdset_0002.o: warning: objtool: fixup_use_fwh_lock()+0x0: stack state mismatch: cfa1=6+16 cfa2=7+8
        drivers/mtd/chips/cfi_cmdset_0002.o: warning: objtool: do_otp_write()+0xa: unsupported stack pointer realignment
        drivers/mtd/chips/cfi_cmdset_0002.o: warning: objtool: do_otp_write()+0x0: stack state mismatch: cfa1=-4-40 cfa2=7+8
      Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
      Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/43e7aae9a7a7710cd6df597fa9dc501da4ba0602.1502472193.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      ee97638b
  5. 15 Aug, 2017 1 commit
  6. 11 Aug, 2017 2 commits
  7. 10 Aug, 2017 10 commits
  8. 09 Aug, 2017 14 commits
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 8d31f80e
      Linus Torvalds authored
      Pull pin control fixes from Linus Walleij:
       "These are the pin control fixes I have gathered since the return from
        my vacation. They boiled in -next a while so let's get them in.
      
        Apart from the documentation build it is purely driver fixes. Which is
        nice. The Intel fixes seem kind of important.
      
         - Fix the documentation build as the docs were moved
      
         - Correct the UART pin list on the Intel Merrifield
      
         - Fix pin assignment and number of pins on the Marvell Armada 37xx
           pin controller
      
         - Cover the Setzer models in the Chromebook DMI quirk in the Intel
           cheryview driver so they start working
      
         - Add the missing "sim" function to the sunxi driver
      
         - Fix USB pin definitions on Uniphier Pro4
      
         - Smatch fix for invalid reference in the zx pin control driver"
      
      * tag 'pinctrl-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
        pinctrl: generic: update references to Documentation/pinctrl.txt
        pinctrl: intel: merrifield: Correct UART pin lists
        pinctrl: armada-37xx: Fix number of pin in south bridge
        pinctrl: armada-37xx: Fix the pin 23 on south bridge
        pinctrl: cherryview: Add Setzer models to the Chromebook DMI quirk
        pinctrl: sunxi: add a missing function of A10/A20 pinctrl driver
        pinctrl: uniphier: fix USB3 pin assignment for Pro4
        pinctrl: zte: fix dereference of 'data' in zx_set_mux()
      8d31f80e
    • Mel Gorman's avatar
      futex: Remove unnecessary warning from get_futex_key · 48fb6f4d
      Mel Gorman authored
      Commit 65d8fc77 ("futex: Remove requirement for lock_page() in
      get_futex_key()") removed an unnecessary lock_page() with the
      side-effect that page->mapping needed to be treated very carefully.
      
      Two defensive warnings were added in case any assumption was missed and
      the first warning assumed a correct application would not alter a
      mapping backing a futex key.  Since merging, it has not triggered for
      any unexpected case but Mark Rutland reported the following bug
      triggering due to the first warning.
      
        kernel BUG at kernel/futex.c:679!
        Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
        Modules linked in:
        CPU: 0 PID: 3695 Comm: syz-executor1 Not tainted 4.13.0-rc3-00020-g307fec773ba3 #3
        Hardware name: linux,dummy-virt (DT)
        task: ffff80001e271780 task.stack: ffff000010908000
        PC is at get_futex_key+0x6a4/0xcf0 kernel/futex.c:679
        LR is at get_futex_key+0x6a4/0xcf0 kernel/futex.c:679
        pc : [<ffff00000821ac14>] lr : [<ffff00000821ac14>] pstate: 80000145
      
      The fact that it's a bug instead of a warning was due to an unrelated
      arm64 problem, but the warning itself triggered because the underlying
      mapping changed.
      
      This is an application issue but from a kernel perspective it's a
      recoverable situation and the warning is unnecessary so this patch
      removes the warning.  The warning may potentially be triggered with the
      following test program from Mark although it may be necessary to adjust
      NR_FUTEX_THREADS to be a value smaller than the number of CPUs in the
      system.
      
          #include <linux/futex.h>
          #include <pthread.h>
          #include <stdio.h>
          #include <stdlib.h>
          #include <sys/mman.h>
          #include <sys/syscall.h>
          #include <sys/time.h>
          #include <unistd.h>
      
          #define NR_FUTEX_THREADS 16
          pthread_t threads[NR_FUTEX_THREADS];
      
          void *mem;
      
          #define MEM_PROT  (PROT_READ | PROT_WRITE)
          #define MEM_SIZE  65536
      
          static int futex_wrapper(int *uaddr, int op, int val,
                                   const struct timespec *timeout,
                                   int *uaddr2, int val3)
          {
              syscall(SYS_futex, uaddr, op, val, timeout, uaddr2, val3);
          }
      
          void *poll_futex(void *unused)
          {
              for (;;) {
                  futex_wrapper(mem, FUTEX_CMP_REQUEUE_PI, 1, NULL, mem + 4, 1);
              }
          }
      
          int main(int argc, char *argv[])
          {
              int i;
      
              mem = mmap(NULL, MEM_SIZE, MEM_PROT,
                     MAP_SHARED | MAP_ANONYMOUS, -1, 0);
      
              printf("Mapping @ %p\n", mem);
      
              printf("Creating futex threads...\n");
      
              for (i = 0; i < NR_FUTEX_THREADS; i++)
                  pthread_create(&threads[i], NULL, poll_futex, NULL);
      
              printf("Flipping mapping...\n");
              for (;;) {
                  mmap(mem, MEM_SIZE, MEM_PROT,
                       MAP_FIXED | MAP_SHARED | MAP_ANONYMOUS, -1, 0);
              }
      
              return 0;
          }
      Reported-and-tested-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
      Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: stable@vger.kernel.org # 4.7+
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      48fb6f4d
    • Linus Torvalds's avatar
      Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux · 358f8c26
      Linus Torvalds authored
      Pull i2c fixes from Wolfram Sang:
       "The main thing is to allow empty id_tables for ACPI to make some
        drivers get probed again. It looks a bit bigger than usual because it
        needs some internal renaming, too.
      
        Other than that, there is a fix for broken DSTDs, a super simple
        enablement for ARM MPS, and two documentation fixes which I'd like to
        see in v4.13 already"
      
      * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
        i2c: rephrase explanation of I2C_CLASS_DEPRECATED
        i2c: allow i2c-versatile for ARM MPS platforms
        i2c: designware: Some broken DSTDs use 1MiHz instead of 1MHz
        i2c: designware: Print clock freq on invalid clock freq error
        i2c: core: Allow empty id_table in ACPI case as well
        i2c: mux: pinctrl: mention correct module name in Kconfig help text
      358f8c26
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 31cf92f3
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "Three patches that should go into this release.
      
        Two of them are from Paolo and fix up some corner cases with BFQ, and
        the last patch is from Ming and fixes up a potential usage count
        imbalance regression due to the recent NOWAIT work"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        blk-mq: don't leak preempt counter/q_usage_counter when allocating rq failed
        block, bfq: consider also in_service_entity to state whether an entity is active
        block, bfq: reset in_service_entity if it becomes idle
      31cf92f3
    • Linus Torvalds's avatar
      Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · d555eb6b
      Linus Torvalds authored
      Pull crypto fixes from Herbert Xu:
       "Fix two regressions in the inside-secure driver with respect to
        hmac(sha1)"
      
      * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        crypto: inside-secure - fix the sha state length in hmac_sha1_setkey
        crypto: inside-secure - fix invalidation check in hmac_sha1_setkey
      d555eb6b
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 4530cca1
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       "The pull requests are getting smaller, that's progress I suppose :-)
      
         1) Fix infinite loop in CIPSO option parsing, from Yujuan Qi.
      
         2) Fix remote checksum handling in VXLAN and GUE tunneling drivers,
            from Koichiro Den.
      
         3) Missing u64_stats_init() calls in several drivers, from Florian
            Fainelli.
      
         4) TCP can set the congestion window to an invalid ssthresh value
            after congestion window reductions, from Yuchung Cheng.
      
         5) Fix BPF jit branch generation on s390, from Daniel Borkmann.
      
         6) Correct MIPS ebpf JIT merge, from David Daney.
      
         7) Correct byte order test in BPF test_verifier.c, from Daniel
            Borkmann.
      
         8) Fix various crashes and leaks in ASIX driver, from Dean Jenkins.
      
         9) Handle SCTP checksums properly in mlx4 driver, from Davide
            Caratti.
      
        10) We can potentially enter tcp_connect() with a cached route
            already, due to fastopen, so we have to explicitly invalidate it.
      
        11) skb_warn_bad_offload() can bark in legitimate situations, fix from
            Willem de Bruijn"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (52 commits)
        net: avoid skb_warn_bad_offload false positives on UFO
        qmi_wwan: fix NULL deref on disconnect
        ppp: fix xmit recursion detection on ppp channels
        rds: Reintroduce statistics counting
        tcp: fastopen: tcp_connect() must refresh the route
        net: sched: set xt_tgchk_param par.net properly in ipt_init_target
        net: dsa: mediatek: add adjust link support for user ports
        net/mlx4_en: don't set CHECKSUM_COMPLETE on SCTP packets
        qed: Fix a memory allocation failure test in 'qed_mcp_cmd_init()'
        hysdn: fix to a race condition in put_log_buffer
        s390/qeth: fix L3 next-hop in xmit qeth hdr
        asix: Fix small memory leak in ax88772_unbind()
        asix: Ensure asix_rx_fixup_info members are all reset
        asix: Add rx->ax_skb = NULL after usbnet_skb_return()
        bpf: fix selftest/bpf/test_pkt_md_access on s390x
        netvsc: fix race on sub channel creation
        bpf: fix byte order test in test_verifier
        xgene: Always get clk source, but ignore if it's missing for SGMII ports
        MIPS: Add missing file for eBPF JIT.
        bpf, s390: fix build for libbpf and selftest suite
        ...
      4530cca1
    • Willem de Bruijn's avatar
      net: avoid skb_warn_bad_offload false positives on UFO · 8d63bee6
      Willem de Bruijn authored
      skb_warn_bad_offload triggers a warning when an skb enters the GSO
      stack at __skb_gso_segment that does not have CHECKSUM_PARTIAL
      checksum offload set.
      
      Commit b2504a5d ("net: reduce skb_warn_bad_offload() noise")
      observed that SKB_GSO_DODGY producers can trigger the check and
      that passing those packets through the GSO handlers will fix it
      up. But, the software UFO handler will set ip_summed to
      CHECKSUM_NONE.
      
      When __skb_gso_segment is called from the receive path, this
      triggers the warning again.
      
      Make UFO set CHECKSUM_UNNECESSARY instead of CHECKSUM_NONE. On
      Tx these two are equivalent. On Rx, this better matches the
      skb state (checksum computed), as CHECKSUM_NONE here means no
      checksum computed.
      
      See also this thread for context:
      http://patchwork.ozlabs.org/patch/799015/
      
      Fixes: b2504a5d ("net: reduce skb_warn_bad_offload() noise")
      Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d63bee6
    • Bjørn Mork's avatar
      qmi_wwan: fix NULL deref on disconnect · bbae08e5
      Bjørn Mork authored
      qmi_wwan_disconnect is called twice when disconnecting devices with
      separate control and data interfaces.  The first invocation will set
      the interface data to NULL for both interfaces to flag that the
      disconnect has been handled.  But the matching NULL check was left
      out when qmi_wwan_disconnect was added, resulting in this oops:
      
        usb 2-1.4: USB disconnect, device number 4
        qmi_wwan 2-1.4:1.6 wwp0s29u1u4i6: unregister 'qmi_wwan' usb-0000:00:1d.0-1.4, WWAN/QMI device
        BUG: unable to handle kernel NULL pointer dereference at 00000000000000e0
        IP: qmi_wwan_disconnect+0x25/0xc0 [qmi_wwan]
        PGD 0
        P4D 0
        Oops: 0000 [#1] SMP
        Modules linked in: <stripped irrelevant module list>
        CPU: 2 PID: 33 Comm: kworker/2:1 Tainted: G            E   4.12.3-nr44-normandy-r1500619820+ #1
        Hardware name: LENOVO 4291LR7/4291LR7, BIOS CBET4000 4.6-810-g50522254fb 07/21/2017
        Workqueue: usb_hub_wq hub_event [usbcore]
        task: ffff8c882b716040 task.stack: ffffb8e800d84000
        RIP: 0010:qmi_wwan_disconnect+0x25/0xc0 [qmi_wwan]
        RSP: 0018:ffffb8e800d87b38 EFLAGS: 00010246
        RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
        RDX: 0000000000000001 RSI: ffff8c8824f3f1d0 RDI: ffff8c8824ef6400
        RBP: ffff8c8824ef6400 R08: 0000000000000000 R09: 0000000000000000
        R10: ffffb8e800d87780 R11: 0000000000000011 R12: ffffffffc07ea0e8
        R13: ffff8c8824e2e000 R14: ffff8c8824e2e098 R15: 0000000000000000
        FS:  0000000000000000(0000) GS:ffff8c8835300000(0000) knlGS:0000000000000000
        CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
        CR2: 00000000000000e0 CR3: 0000000229ca5000 CR4: 00000000000406e0
        Call Trace:
         ? usb_unbind_interface+0x71/0x270 [usbcore]
         ? device_release_driver_internal+0x154/0x210
         ? qmi_wwan_unbind+0x6d/0xc0 [qmi_wwan]
         ? usbnet_disconnect+0x6c/0xf0 [usbnet]
         ? qmi_wwan_disconnect+0x87/0xc0 [qmi_wwan]
         ? usb_unbind_interface+0x71/0x270 [usbcore]
         ? device_release_driver_internal+0x154/0x210
      Reported-and-tested-by: default avatarNathaniel Roach <nroach44@gmail.com>
      Fixes: c6adf779 ("net: usb: qmi_wwan: add qmap mux protocol support")
      Cc: Daniele Palmas <dnlplm@gmail.com>
      Signed-off-by: default avatarBjørn Mork <bjorn@mork.no>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bbae08e5
    • Guillaume Nault's avatar
      ppp: fix xmit recursion detection on ppp channels · 0a0e1a85
      Guillaume Nault authored
      Commit e5dadc65 ("ppp: Fix false xmit recursion detect with two ppp
      devices") dropped the xmit_recursion counter incrementation in
      ppp_channel_push() and relied on ppp_xmit_process() for this task.
      But __ppp_channel_push() can also send packets directly (using the
      .start_xmit() channel callback), in which case the xmit_recursion
      counter isn't incremented anymore. If such packets get routed back to
      the parent ppp unit, ppp_xmit_process() won't notice the recursion and
      will call ppp_channel_push() on the same channel, effectively creating
      the deadlock situation that the xmit_recursion mechanism was supposed
      to prevent.
      
      This patch re-introduces the xmit_recursion counter incrementation in
      ppp_channel_push(). Since the xmit_recursion variable is now part of
      the parent ppp unit, incrementation is skipped if the channel doesn't
      have any. This is fine because only packets routed through the parent
      unit may enter the channel recursively.
      
      Finally, we have to ensure that pch->ppp is not going to be modified
      while executing ppp_channel_push(). Instead of taking this lock only
      while calling ppp_xmit_process(), we now have to hold it for the full
      ppp_channel_push() execution. This respects the ppp locks ordering
      which requires locking ->upl before ->downl.
      
      Fixes: e5dadc65 ("ppp: Fix false xmit recursion detect with two ppp devices")
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0a0e1a85
    • Håkon Bugge's avatar
      rds: Reintroduce statistics counting · 05bfd7db
      Håkon Bugge authored
      In commit 7e3f2952 ("rds: don't let RDS shutdown a connection
      while senders are present"), refilling the receive queue was removed
      from rds_ib_recv(), along with the increment of
      s_ib_rx_refill_from_thread.
      
      Commit 73ce4317 ("RDS: make sure we post recv buffers")
      re-introduces filling the receive queue from rds_ib_recv(), but does
      not add the statistics counter. rds_ib_recv() was later renamed to
      rds_ib_recv_path().
      
      This commit reintroduces the statistics counting of
      s_ib_rx_refill_from_thread and s_ib_rx_refill_from_cq.
      Signed-off-by: default avatarHåkon Bugge <haakon.bugge@oracle.com>
      Reviewed-by: default avatarKnut Omang <knut.omang@oracle.com>
      Reviewed-by: default avatarWei Lin Guay <wei.lin.guay@oracle.com>
      Reviewed-by: default avatarShamir Rabinovitch <shamir.rabinovitch@oracle.com>
      Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      05bfd7db
    • Eric Dumazet's avatar
      tcp: fastopen: tcp_connect() must refresh the route · 8ba60924
      Eric Dumazet authored
      With new TCP_FASTOPEN_CONNECT socket option, there is a possibility
      to call tcp_connect() while socket sk_dst_cache is either NULL
      or invalid.
      
       +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4
       +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
       +0 setsockopt(4, SOL_TCP, TCP_FASTOPEN_CONNECT, [1], 4) = 0
       +0 connect(4, ..., ...) = 0
      
      << sk->sk_dst_cache becomes obsolete, or even set to NULL >>
      
       +1 sendto(4, ..., 1000, MSG_FASTOPEN, ..., ...) = 1000
      
      We need to refresh the route otherwise bad things can happen,
      especially when syzkaller is running on the host :/
      
      Fixes: 19f6d3f3 ("net/tcp-fastopen: Add new API support")
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Wei Wang <weiwan@google.com>
      Cc: Yuchung Cheng <ycheng@google.com>
      Acked-by: default avatarWei Wang <weiwan@google.com>
      Acked-by: default avatarYuchung Cheng <ycheng@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8ba60924
    • Xin Long's avatar
      net: sched: set xt_tgchk_param par.net properly in ipt_init_target · ec0acb09
      Xin Long authored
      Now xt_tgchk_param par in ipt_init_target is a local varibale,
      par.net is not initialized there. Later when xt_check_target
      calls target's checkentry in which it may access par.net, it
      would cause kernel panic.
      
      Jaroslav found this panic when running:
      
        # ip link add TestIface type dummy
        # tc qd add dev TestIface ingress handle ffff:
        # tc filter add dev TestIface parent ffff: u32 match u32 0 0 \
          action xt -j CONNMARK --set-mark 4
      
      This patch is to pass net param into ipt_init_target and set
      par.net with it properly in there.
      
      v1->v2:
        As Wang Cong pointed, I missed ipt_net_id != xt_net_id, so fix
        it by also passing net_id to __tcf_ipt_init.
      v2->v3:
        Missed the fixes tag, so add it.
      
      Fixes: ecb2421b ("netfilter: add and use nf_ct_netns_get/put")
      Reported-by: default avatarJaroslav Aster <jaster@redhat.com>
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ec0acb09
    • John Crispin's avatar
      net: dsa: mediatek: add adjust link support for user ports · 8e6f1521
      John Crispin authored
      Manually adjust the port settings of user ports once PHY polling has
      completed. This patch extends the adjust_link callback to configure the
      per port PMCR register, applying the proper values polled from the PHY.
      Without this patch flow control was not always getting setup properly.
      Signed-off-by: default avatarShashidhar Lakkavalli <shashidhar.lakkavalli@openmesh.com>
      Signed-off-by: default avatarMuciri Gatimu <muciri@openmesh.com>
      Signed-off-by: default avatarJohn Crispin <john@phrozen.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8e6f1521
    • Davide Caratti's avatar
      net/mlx4_en: don't set CHECKSUM_COMPLETE on SCTP packets · e718fe45
      Davide Caratti authored
      if the NIC fails to validate the checksum on TCP/UDP, and validation of IP
      checksum is successful, the driver subtracts the pseudo-header checksum
      from the value obtained by the hardware and sets CHECKSUM_COMPLETE. Don't
      do that if protocol is IPPROTO_SCTP, otherwise CRC32c validation fails.
      
      V2: don't test MLX4_CQE_STATUS_IPV6 if MLX4_CQE_STATUS_IPV4 is set
      Reported-by: default avatarShuang Li <shuali@redhat.com>
      Fixes: f8c6455b ("net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE")
      Signed-off-by: default avatarDavide Caratti <dcaratti@redhat.com>
      Acked-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e718fe45
  9. 08 Aug, 2017 5 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma · bfa738cf
      Linus Torvalds authored
      Pull rdma fixes from Doug Ledford:
       "Third set of -rc fixes for 4.13 cycle
      
         - small set of miscellanous fixes
      
         - a reasonably sizable set of IPoIB fixes that deal with multiple
           long standing issues"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma:
        IB/hns: checking for IS_ERR() instead of NULL
        RDMA/mlx5: Fix existence check for extended address vector
        IB/uverbs: Fix device cleanup
        RDMA/uverbs: Prevent leak of reserved field
        IB/core: Fix race condition in resolving IP to MAC
        IB/ipoib: Notify on modify QP failure only when relevant
        Revert "IB/core: Allow QP state transition from reset to error"
        IB/ipoib: Remove double pointer assigning
        IB/ipoib: Clean error paths in add port
        IB/ipoib: Add get statistics support to SRIOV VF
        IB/ipoib: Add multicast packets statistics
        IB/ipoib: Set IPOIB_NEIGH_TBL_FLUSH after flushed completion initialization
        IB/ipoib: Prevent setting negative values to max_nonsrq_conn_qp
        IB/ipoib: Make sure no in-flight joins while leaving that mcast
        IB/ipoib: Use cancel_delayed_work_sync when needed
        IB/ipoib: Fix race between light events and interface restart
      bfa738cf
    • Joe Perches's avatar
      parse-maintainers: Move matching sections from MAINTAINERS · b95c29a2
      Joe Perches authored
      Allow any number of command line arguments to match either the
      section header or the section contents and create new files.
      
      Create MAINTAINERS.new and SECTION.new.
      
      This allows scripting of the movement of various sections from
      MAINTAINERS.
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b95c29a2
    • Joe Perches's avatar
      parse-maintainers: Use perl hash references and specific filenames · fe909030
      Joe Perches authored
      Instead of reading STDIN and writing STDOUT, use specific filenames of
      MAINTAINERS and MAINTAINERS.new.
      
      Use hash references instead of global hash %hash so future modifications
      can read and write specific hashes to split up MAINTAINERS into multiple
      files using a script.
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fe909030
    • Joe Perches's avatar
      parse-maintainers: Add section pattern sorting · 61f74164
      Joe Perches authored
      Section [A-Z]: patterns are not currently in any required sorting order.
      Add a specific sorting sequence to MAINTAINERS entries.
      Sort F: and X: patterns in alphabetic order.
      
      The preferred section ordering is:
      
        SECTION HEADER
        M:	Maintainers
        R:	Reviewers
        P:	Named persons without email addresses
        L:	Mailing list addresses
        S:	Status of this section (Supported, Maintained, Orphan, etc...)
        W:	Any relevant URLs
        T:	Source code control type (git, quilt, etc)
        Q:	Patchwork patch acceptance queue site
        B:	Bug tracking URIs
        C:	Chat URIs
        F:	Files with wildcard patterns (alphabetic ordered)
        X:	Excluded files with wildcard patterns (alphabetic ordered)
        N:	Files with regex patterns
        K:	Keyword regexes in source code for maintainership identification
      
      Miscellaneous perl neatening:
      
       - Rename %map to %hash, map has a different meaning in perl
       - Avoid using \& and local variables for function indirection
       - Use return for a little c like clarity
       - Use c-like function call style instead of &function
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      61f74164
    • Joe Perches's avatar
      get_maintainer: Prepare for separate MAINTAINERS files · 6f7d98ec
      Joe Perches authored
      Allow for MAINTAINERS to become a directory and if it is,
      read all the files in the directory for maintained sections.
      
      Optionally look for all files named MAINTAINERS in directories
      excluding the .git directory by using --find-maintainer-files.
      
      This optional feature adds ~.3 seconds of CPU on an Intel
      i5-6200 with an SSD.
      
      Miscellanea:
      
       - Create a read_maintainer_file subroutine from the existing code
       - Test only the existence of MAINTAINERS, not whether it's a file
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6f7d98ec