Messages in this thread |  | | Subject | Net iovec Oops | From | Daniel Schepler <> | Date | 24 Jan 1997 01:04:58 -0600 |
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Under 2.1.22, playing with SCM_CREDENTIALS, I once accidentally put msg.msg_iov = NULL but msg.msg_iovlen = 1 in a call to sendmsg. This created a reproducible oops:
Unable to handle kernel NULL pointer dereference at virtual address 00000004 current->tss.cr3 = 011c3000, \r3 = 011c3000 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c013ab94>] EFLAGS: 00010202 eax: c1203418 ebx: 00000000 ecx: c1203410 edx: c1203408 esi: c0c02940 edi: 00000008 ebp: 00000008 esp: c0aeadc8 ds: 0018 es: 0018 ss: 0018 Process cred (pid: 2348, process nr: 67, stackpage=c0aea000) Stack: c1203418 c0c02940 00000008 c0aeae08 c1ea4018 c013eda2 c1203408 00000000 00000008 00000000 c0c02940 c013ec28 c0aeae00 00000000 c1ea4018 c0aeae50 c0aeae78 c01379c8 c0c02940 c0aeae78 00000008 c0aeae3c c0aeae94 00000003 Call Trace: [<c013eda2>] [<c013ec28>] [<c01379c8>] [<c013ec28>] [<c01390a7>] [<c011b498>] [<c011b986>] [<c011ba07>] [<c011b878>] [<c013967c>] [<c0117020>] [<c010a4ac>] Code: 8b 43 04 85 c0 74 64 39 c5 7f 02 89 e8 89 c2 8b 33 89 74 24
The ksymoops analysis was
Using `/usr/src/linux/System.map' to map addresses to symbols.
>>EIP: c013ab94 <memcpy_fromiovec+14/90> Trace: c013eda2 <unix_stream_sendmsg+17a/220> Trace: c013eda2 <unix_stream_sendmsg+17a/220> Trace: c01379c8 <sock_sendmsg+a0/c4> Trace: c013eda2 <unix_stream_sendmsg+17a/220> Trace: c01390a7 <sys_sendmsg+22f/278> Trace: c011b498 <do_wp_page> Trace: c011b986 <do_no_page+10e/330> Trace: c011ba07 <do_no_page+18f/330> Trace: c011ba07 <do_no_page+18f/330> Trace: c013967c <sys_socketcall+2e4/318> Trace: c0117020 <notify_parent+3c/44> Trace: c010a4ac <tracesys+18/26>
Code: c013ab94 <memcpy_fromiovec+14/90> movl 0x4(%ebx),%eax Code: c013ab97 <memcpy_fromiovec+17/90> testl %eax,%eax Code: c013ab99 <memcpy_fromiovec+19/90> je c013abff <memcpy_fromiovec+7f/90> Code: c013ab9b <memcpy_fromiovec+1b/90> cmpl %eax,%ebp Code: c013ab9d <memcpy_fromiovec+1d/90> jg c013aba1 <memcpy_fromiovec+21/90> Code: c013ab9f <memcpy_fromiovec+1f/90> movl %ebp,%eax Code: c013aba1 <memcpy_fromiovec+21/90> movl %eax,%edx Code: c013aba3 <memcpy_fromiovec+23/90> movl (%ebx),%esi Code: c013aba5 <memcpy_fromiovec+25/90> movl %esi,0x0(%esp,1) Code: c013aba9 <memcpy_fromiovec+29/90> nop Code: c013abaa <memcpy_fromiovec+2a/90> nop Code: c013abab <memcpy_fromiovec+2b/90> nop
-- Daniel Schepler A cookie created by the glacier daniel@frobnitz.wustl.edu wobbled up the ramp into a http://frobnitz.wustl.edu/~daniel/ cement mixer.
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