[PATCH 2.5.66 & 2.4.20] Fix sys_sethostname() and sys_setdomainname()

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Hi,

a long time ago someone mentioned that sethostname() and setdomainname()
properly return -EFAULT when passing an invalid pointer to the new name, but
instead of leaving the fields in system_utsname unchanged the nodename and
domainname are set to an empty string.

The behaviour of sys_sethostname() can be verified using the attached program
(sethostname.c); sys_setdomainname() is almost the same so I guess that it
has the same defect :-)

The attached patches fix this.

Stephan

• text/x-diff attachment: sethostanddomainname-2.5.66.diff

• text/x-csrc attachment: sethostname.c

• text/x-diff attachment: sethostanddomainname-2.4.20.diff

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