On Thu, Mar 14, 2013 at 09:58:31PM +0100, Toralf Förster wrote:
> On 03/14/2013 09:51 PM, richard -rw- weinberger wrote:
> > Can you please re-run with the attached patch.
> > I'm wondering how much memory is requested.
> >>From reading the source I'd say it must be less than PAGE_SIZE.
> > But such a small allocation would not trigger the WARN_ON()...
>
>
> 2013-03-14T21:56:58.000+01:00 trinity sshd[1158]: pam_unix(sshd:session):
> session opened for user tfoerste by (uid=0)
> 2013-03-14T21:56:59.852+01:00 trinity kernel: memdup_user: -14
> 2013-03-14T21:56:59.852+01:00 trinity kernel: ------------[ cut here
> ]------------
> 2013-03-14T21:56:59.852+01:00 trinity kernel: WARNING: at
> mm/page_alloc.c:2386 __alloc_pages_nodemask+0x153/0x750()
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbd14: [<08342dd8>]
> dump_stack+0x22/0x24
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbd2c: [<0807d0da>]
> warn_slowpath_common+0x5a/0x80
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbd54: [<0807d1a3>]
> warn_slowpath_null+0x23/0x30
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbd64: [<080d3213>]
> __alloc_pages_nodemask+0x153/0x750
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbdf0: [<080d3838>]
> __get_free_pages+0x28/0x50
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbe08: [<080fc48f>]
> __kmalloc_track_caller+0x3f/0x180
> 2013-03-14T21:56:59.852+01:00 trinity kernel: 38bfbe30: [<080dec82>]
> memdup_user+0x32/0x70
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbe4c: [<080dee7e>]
> strndup_user+0x3e/0x60
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbe68: [<0811b440>]
> copy_mount_string+0x30/0x50
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbe7c: [<0811be0a>]
> sys_mount+0x1a/0xe0
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbeac: [<08062a92>]
> handle_syscall+0x82/0xb0
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbef4: [<08074e7d>]
> userspace+0x46d/0x590
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbfec: [<0805f7cc>]
> fork_handler+0x6c/0x70
> 2013-03-14T21:56:59.853+01:00 trinity kernel: 38bfbffc: [<5a5a5a5a>]
> 0x5a5a5a5a
> 2013-03-14T21:56:59.853+01:00 trinity kernel:
> 2013-03-14T21:56:59.853+01:00 trinity kernel: ---[ end trace
> 5bf182a223bd623c ]---
> 2013-03-14T21:56:59.853+01:00 trinity kernel: memdup_user: -14
hah, strndup_user taking a signed long instead of a size_t as it's length arg.
either it needs to change, or it needs an explicit check for < 1
I wonder how many other paths make it possible to pass negative numbers here.
Dave
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