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Add better sanity checking to the logic that handles ioctl processing

Browse source 
for nfsclient and nfs4client in order to prevent local root users
from panicing the system.

PR:		kern/77463
Submitted by:	Wojciech A. Koszek
Reviewed by:	cel, rees
MFC after:	2 weeks
Security:	Local root users can panic the system at will
This commit is contained in:
Chuck Lever 2006-05-13 00:16:35 +00:00
parent ace86f3f27
commit 5f396e80f0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=158505
1 changed files with 7 additions and 4 deletions
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5
sys/nfs4client/nfs4_dev.c
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@ -152,7 +152,8 @@ nfs4dev_reply(caddr_t addr)
return EINVAL;
}
if (m->msg_len == 0 || m->msg_len > NFS4DEV_MSG_MAX_DATALEN) {
if (m->msg_len < sizeof(*m) - NFS4DEV_MSG_MAX_DATALEN ||
m->msg_len > NFS4DEV_MSG_MAX_DATALEN) {
NFS4DEV_DEBUG("bad message length\n");
return EINVAL;
}
@ -197,8 +198,10 @@ nfs4dev_reply(caddr_t addr)
return 0;
bad:
if (u) {
u->up_error = error;
wakeup(u);
}
return error;
}