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Message-ID: <20170503133006.7jv4qhnnbsv7ueam@treble> Date: Wed, 3 May 2017 08:30:06 -0500 From: Josh Poimboeuf <jpoimboe@...hat.com> To: Andrey Konovalov <andreyknvl@...gle.com> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, LKML <linux-kernel@...r.kernel.org>, Vlad Yasevich <vyasevich@...il.com>, Neil Horman <nhorman@...driver.com>, "David S. Miller" <davem@...emloft.net>, linux-sctp@...r.kernel.org, netdev <netdev@...r.kernel.org>, Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>, Kostya Serebryany <kcc@...gle.com>, syzkaller <syzkaller@...glegroups.com>, Eric Dumazet <edumazet@...gle.com>, Cong Wang <xiyou.wangcong@...il.com> Subject: Re: x86: warning: kernel stack regs has bad 'bp' value 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? 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
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