On Wed, May 3, 2017 at 5:50 PM, Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: > 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. Hi Josh I didn't see any more reports over the night. Could you mail the patch? Thanks! > > 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
