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To: Julian Elischer <julian@elischer.org>
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Cc: FreeBSD Current <current@freebsd.org>
Subject: Re: stack hogs in kernel
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On Fri, 11 Apr 2008, Julian Elischer wrote:

> 0xc05667e3 kldstat [kernel]:				2100
> 0xc07214f8 sendsig [kernel]:				1416
> 0xc04fb426 ugenread [kernel]:				1200
> 0xc070616b ipmi_smbios_identify [kernel]:		1136
> 0xc050bd26 usbd_new_device [kernel]:			1128
> 0xc0525a83 pfs_readlink [kernel]:			1092
> 0xc04fb407 ugenwrite [kernel]:				1056
> 0xc055ea33 prison_enforce_statfs [kernel]:		1044

This one, at least, is due to an issue Roman pointed out on hackers@ in the 
last 24 hours -- a MAXPATHLEN sized buffer on the stack.  Looks like 
pfs_readlink() has the same issue.

Robert N M Watson
Computer Laboratory
University of Cambridge

> 0xc0686e8a nfsrv_rename [kernel]:			984
> 0xc05d0886 m_copymdata [kernel]:			956
> 0xc06605a3 nfs4_mount [kernel]:				884
> 0xc0561e25 kse_switchin [kernel]:			848
> 0xc0680ac6 nfsrv_statfs [kernel]:			828
> 0xc0439473 cam_periph_error [kernel]:			820
> 0xc071ff36 sigreturn [kernel]:				812
> 0xc067e876 nfsrv_fsinfo [kernel]:			804
> 0xc05fe7b3 freebsd4_fhstatfs [kernel]:			804
> 0xc0571272 sysctl_out_proc [kernel]:			804
> 0xc067ebf7 nfsrv_fsinfo [kernel]:			804
> 0xc0571006 sysctl_out_proc [kernel]:			804
> 0xc044b743 cddone [kernel]:				800
> 0xc06862cf nfsrv_link [kernel]:				796
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