On Wed, May 3, 2017 at 3:30 PM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote: > On Wed, May 03, 2017 at 02:48:28PM +0200, Andrey Konovalov wrote: >> Hi, >> >> I've got the following error report while fuzzing the kernel with syzkaller. >> >> On commit 89c9fea3c8034cdb2fd745f551cde0b507fd6893 (4.11.0+). >> >> A reproducer and .config are attached. >> >> The reproducer open SCTP sockets and sends data to it in a loop. >> I'm not sure whether this is an issue with SCTP or with something else. >> >> WARNING: kernel stack regs at ffff8800686869f8 in a.out:4933 has bad >> 'bp' value c3fc855a10167ec0 > > Hi Andrey, > > Can you test this patch? Hi Josh, This seems to be fixing the reports caused by the reproducers. I'll keep fuzzing though with syzkaller to make sure. Thanks! > > > diff --git a/arch/x86/lib/csum-copy_64.S b/arch/x86/lib/csum-copy_64.S > index 7e48807..45a53df 100644 > --- a/arch/x86/lib/csum-copy_64.S > +++ b/arch/x86/lib/csum-copy_64.S > @@ -55,7 +55,7 @@ ENTRY(csum_partial_copy_generic) > movq %r12, 3*8(%rsp) > movq %r14, 4*8(%rsp) > movq %r13, 5*8(%rsp) > - movq %rbp, 6*8(%rsp) > + movq %r15, 6*8(%rsp) > > movq %r8, (%rsp) > movq %r9, 1*8(%rsp) > @@ -74,7 +74,7 @@ ENTRY(csum_partial_copy_generic) > /* main loop. clear in 64 byte blocks */ > /* r9: zero, r8: temp2, rbx: temp1, rax: sum, rcx: saved length */ > /* r11: temp3, rdx: temp4, r12 loopcnt */ > - /* r10: temp5, rbp: temp6, r14 temp7, r13 temp8 */ > + /* r10: temp5, r15: temp6, r14 temp7, r13 temp8 */ > .p2align 4 > .Lloop: > source > @@ -89,7 +89,7 @@ ENTRY(csum_partial_copy_generic) > source > movq 32(%rdi), %r10 > source > - movq 40(%rdi), %rbp > + movq 40(%rdi), %r15 > source > movq 48(%rdi), %r14 > source > @@ -103,7 +103,7 @@ ENTRY(csum_partial_copy_generic) > adcq %r11, %rax > adcq %rdx, %rax > adcq %r10, %rax > - adcq %rbp, %rax > + adcq %r15, %rax > adcq %r14, %rax > adcq %r13, %rax > > @@ -121,7 +121,7 @@ ENTRY(csum_partial_copy_generic) > dest > movq %r10, 32(%rsi) > dest > - movq %rbp, 40(%rsi) > + movq %r15, 40(%rsi) > dest > movq %r14, 48(%rsi) > dest > @@ -203,7 +203,7 @@ ENTRY(csum_partial_copy_generic) > movq 3*8(%rsp), %r12 > movq 4*8(%rsp), %r14 > movq 5*8(%rsp), %r13 > - movq 6*8(%rsp), %rbp > + movq 6*8(%rsp), %r15 > addq $7*8, %rsp > ret > -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
