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PR/17507 CVS commit: src/sys/kern

The following reply was made to PR kern/17507; it has been noted by GNATS.

From: David Laight <>
Subject: PR/17507 CVS commit: src/sys/kern
Date: Sat, 12 Dec 2009 17:47:05 +0000

 Module Name:   src
 Committed By:  dsl
 Date:          Sat Dec 12 17:47:05 UTC 2009
 Modified Files:
        src/sys/kern: sys_select.c
 Log Message:
 Bounding the 'nfds' arg to poll() at the current process limit for actual
 open files is rather gross - the poll map isn't required to be dense.
 Instead limit to a much larger value (1000 + dt_nfiles) so that user
 programs cannot allocate indefinite sized blocks of kvm.
 If the limit is exceeded, then return EINVAL instead of silently truncating
 the list.
 (The silent truncation in select isn't quite as bad - although even there
 any high bits that are set ought to generate an EBADF response.)
 Move the code that converts ERESTART and EWOULDBLOCK into common code.
 Effectively fixes PR/17507 since the new limit is unlikely to be detected.
 To generate a diff of this commit:
 cvs rdiff -u -r1.19 -r1.20 src/sys/kern/sys_select.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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