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Date: Fri, 15 Jan 2016 16:47:35 -0200
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: 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>,
LKML <linux-kernel@...r.kernel.org>,
syzkaller <syzkaller@...glegroups.com>,
Kostya Serebryany <kcc@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Sasha Levin <sasha.levin@...cle.com>,
Eric Dumazet <edumazet@...gle.com>
Subject: Re: net/sctp: sctp_datamsg memory leak
On Fri, Jan 08, 2016 at 01:25:07PM -0200, Marcelo Ricardo Leitner wrote:
> On Wed, Dec 30, 2015 at 10:24:19PM +0100, Dmitry Vyukov wrote:
> > Hello,
> >
> > The following program leads to leak of multiple objects allocated in
> > sctp_datamsg_from_user:
> >
> >
> > // autogenerated by syzkaller (http://github.com/google/syzkaller)
> > #include <unistd.h>
> > #include <sys/syscall.h>
> > #include <string.h>
> > #include <stdint.h>
> > #include <pthread.h>
> >
> > long r[50];
> >
> > int main()
> > {
> > memset(r, -1, sizeof(r));
> > r[0] = syscall(SYS_mmap, 0x20000000ul, 0x100000ul, 0x3ul,
> > 0x32ul, 0xfffffffffffffffful, 0x0ul);
> > r[1] = syscall(SYS_socket, 0x2ul, 0x80801ul, 0x84ul, 0, 0, 0);
> > memcpy((void*)0x20002f80,
> > "\x02\x00\x33\xd9\x7f\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
> > 128);
> > r[3] = syscall(SYS_bind, r[1], 0x20002f80ul, 0x80ul, 0, 0, 0);
> > memcpy((void*)0x20003f80,
> > "\x02\x00\x33\xd9\x7f\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
> > 128);
> > r[5] = syscall(SYS_connect, r[1], 0x20003f80ul, 0x80ul, 0, 0, 0);
> > r[6] = syscall(SYS_pread64, r[1], 0x20000feeul, 0xe5ul, 0x0ul, 0, 0);
> > memcpy((void*)0x20003000,
> > "\xdb\x4c\xcc\xa8\x07\xbd\xaa\x58\x7c\x57\x37\x63\xa1\x4d\xdb\x5b\x85\x4e\x37\x3b\x20\xb3\x12\xef\x9b\x75\xf0\x88\x28\xa5\x43\x8e\x56\x59\x3c\x16\xfd\xa0\x01\x4f\x90\x83\x4c\x1b\x22\x3e\xd4\xea\x36\x6f\xb5\x43\x96\x02\x8e\x82\xa1\xc6\x47\xd7\xeb\x08\x56\x6f\x40\xb6\x00\x3f\x52\x38\x99\x2f\x57\x63\x9b\xe4\x0e\xb2\x59\xb2\x59\xbc\x9d\x46\xd0\x52\xd4\x91\xe8\xee\x7f\xcf\x81\xa0\xd5\x10\xc4\x77\xf6\xa1\xa1\x35\xb3\xeb\xb5\x46\xfe\xbc\x83\x74\x9f\x78\xa4\xf1\x0b\xf2\x3a\x41\xc3\x2d\x78\x32\x3b\x88\xe9\xb7\x9f\x56",
> > 128);
> > r[8] = syscall(SYS_write, r[1], 0x20003000ul, 0x80ul, 0, 0, 0);
> > memcpy((void*)0x2000332a,
> > "\xdf\x9a\x13\x9f\x3d\xc5\xd9\xbb\xba\x6d\x46\xb4\xd9\x55\xc0\x39\x0d\xf7\xd0\x9d\x1b\x2b\x8c\xb7\xb2\x52\x8b\xe9\xb8\x73\x6d\x47\x24\x4e\xa3\x1d\xb9\x31\xf1\xae\xa3\x4f\x0f\xd7\xbb\xad\xa7\x4f\xa9\xa3\x2b\x04\xf7\xa8\x5e\x81\x93\x75\x03\x9d\xec\x9a\x03\xbf\xc5\x6c\xb2\xf3\x8b",
> > 69);
> > r[10] = syscall(SYS_write, r[1], 0x2000332aul, 0x45ul, 0, 0, 0);
> > r[11] = syscall(SYS_shutdown, r[1], 0x1ul, 0, 0, 0, 0);
> > memcpy((void*)0x20001919, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8);
> > memcpy((void*)0x20001000, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8);
> > r[14] = syscall(SYS_rename, 0x20001919ul, 0x20001000ul, 0, 0, 0, 0);
> > *(uint32_t*)0x200013b2 = r[1];
> > *(uint16_t*)0x200013b6 = (uint16_t)0x9;
> > *(uint16_t*)0x200013b8 = (uint16_t)0x8;
> > *(uint32_t*)0x200013ba = r[1];
> > *(uint16_t*)0x200013be = (uint16_t)0xe77;
> > *(uint16_t*)0x200013c0 = (uint16_t)0xa036af6cbe637e9d;
> > *(uint32_t*)0x200013c2 = r[1];
> > *(uint16_t*)0x200013c6 = (uint16_t)0x8;
> > *(uint16_t*)0x200013c8 = (uint16_t)0xfffffffffffff1de;
> > *(uint64_t*)0x20000ff9 = (uint64_t)0x0;
> > *(uint64_t*)0x20001001 = (uint64_t)0x989680;
> > *(uint64_t*)0x20001000 = (uint64_t)0x2;
> > r[27] = syscall(SYS_ppoll, 0x200013b2ul, 0x3ul, 0x20000ff9ul,
> > 0x20001000ul, 0x8ul, 0);
> > *(uint64_t*)0x20001000 = (uint64_t)0x20001d27;
> > *(uint64_t*)0x20001008 = (uint64_t)0x39;
> > *(uint64_t*)0x20001010 = (uint64_t)0x20001ffe;
> > *(uint64_t*)0x20001018 = (uint64_t)0xd9;
> > *(uint64_t*)0x20001020 = (uint64_t)0x20001323;
> > *(uint64_t*)0x20001028 = (uint64_t)0xfb;
> > *(uint64_t*)0x20001030 = (uint64_t)0x20000fe3;
> > *(uint64_t*)0x20001038 = (uint64_t)0x1c;
> > *(uint64_t*)0x20001040 = (uint64_t)0x20001fc6;
> > *(uint64_t*)0x20001048 = (uint64_t)0xea;
> > memcpy((void*)0x20001d27,
> > "\x5d\x27\xd4\x12\xc2\x99\xce\x3f\x64\x88\x1f\x2f\xb1\xe9\xcb\x5c\x1e\x23\x13\xa1\xbb\x1c\xf0\xb3\x76\xa5\xfd\xf6\x0e\x87\xaf\x9f\x68\x47\xb2\x7a\x2e\xb2\xea\x18\xd6\x2a\x9b\xf5\xce\xaa\x33\x6c\x0a\x2d\xdb\x2b\xf7\x6c\xb5\x38\x31",
> > 57);
> > memcpy((void*)0x20001ffe,
> > "\x01\xea\x49\xef\x6c\x2c\x8c\x64\xcd\x39\xcf\xc2\x8c\xba\xd0\x02\x04\x31\x51\x56\x62\x19\xdf\x09\x07\x87\x4f\xf6\x5d\x57\xcc\xea\x52\x02\xc3\x2b\xae\x62\x8e\xf1\x31\xa2\x5e\xf8\x69\x83\xe2\x47\x03\x5a\x2e\x35\x75\x07\xd0\xe6\x8e\x1b\x31\x4b\xef\xf4\x8a\xb4\x7b\xf1\x3a\x9c\x96\xa6\x90\xa0\x3a\x52\x83\x40\xff\x91\x50\x9f\xeb\x98\x9f\xcc\x24\xf6\x46\x1e\xe9\xa5\x34\x35\x9e\x1d\x03\xf4\x9e\x05\x6c\x26\xa0\x09\x07\x55\x26\xdd\x7e\x42\x3c\x59\x80\xdc\x86\x3d\xf7\xed\x87\x92\x27\xf0\x83\x03\x44\xaa\xce\x73\x5e\x51\x69\xd3\xce\xbb\xb7\x6d\x67\x04\xaa\x5c\x34\x0c\xa7\x0e\xd3\xc8\x9c\xd2\x9a\x61\xf2\xeb\x4a\xbf\x89\x30\xfb\xef\x76\x9a\xe6\x6a\xac\x32\x5e\xa3\xc3\x5d\x09\xe2\xc5\x2a\xe4\x83\x81\x76\xa5\x3d\x7f\xa2\xf3\xa4\x7a\x28\x00\x9a\xfe\xcc\x8f\x5b\x24\x74\x73\x72\x2a\x5d\xbb\xd2\xe7\xc3\xb9\xab\xfd\x20\x74\xc9\xc0\x67\xeb\x1b\x06\x8d\x01\x7b\x85\x5f\x11\xbe\x76",
> > 217);
> > memcpy((void*)0x20001323,
> > "\xd7\x13\xc9\x4c\x56\x6e\x36\x52\x01\xcc\x2d\xf6\xbf\xdf\x25\xfb\x80\xb3\x4c\xbb\xcd\x6c\x20\x5b\xdb\x31\x38\x6a\x3f\x1a\xd1\x03\xf8\x2a\x4f\x0f\xe0\x61\xe3\x78\x09\x90\x4f\xea\x4e\x56\x87\x30\x3c\xea\xc2\xb2\x68\xaf\x3b\x40\x73\x78\xa1\x0e\xe9\x26\x50\x2a\x36\x83\xfb\x09\x0d\x23\x70\xc4\x9b\xef\xae\x19\x7a\x3d\x4d\x11\xfb\x8f\xa1\xbc\x0f\xac\xed\x59\x53\xf2\xc2\xce\xdd\x9b\x17\xd9\x1a\xbd\xfe\xe2\x33\x92\xbc\x29\x44\xb1\xa7\xc2\x99\xb9\x5c\xab\xff\x21\x91\xb3\xc3\xc1\xd4\xc6\x35\x4c\xdd\x01\x5a\x4c\x11\x6a\x90\xe6\xe3\x06\xcc\xdc\x99\x26\xfa\xba\x53\xe8\xdb\x4a\x96\x68\x16\xd3\x81\x92\xa7\x33\x97\x96\xbd\x2a\xc0\xc5\x3c\x07\x8a\x43\x1a\x32\x75\x1e\xbb\x9b\xee\xe9\x57\x04\x9d\xd2\xcd\x79\xaf\xf9\x92\x22\x85\xe3\x96\x6b\xb5\xc0\x4d\xe1\x2f\x74\x0c\x4e\xc8\x98\x35\xa8\xa2\xbc\x78\x2f\xbe\x54\x65\xbe\xde\xce\x89\xf0\xdd\xa4\x04\x31\xfb\x0c\x84\x27\x56\xde\x87\xfc\xa1\xb2\xb7\x5a\xc0\x8d\x40\x00\x18\xd2\x8f\x88\x4b\xa7\x30\xe0\x71\xf0\x6a\xff\x52\x1c\x0a\x62\x9b\xe5\x15\x03\x!
> d6!
> > \xe9\x32\
> > xde\x36",
> > 251);
>
> Please clarify this line. It doesn't compile as-is and the len doesn't
> match the data itself.
What should I use here?
Marcelo
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