linux-kernel - execve manpage changes

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Message-ID: <65dd6fd50708061746p2a460fe5p24f1068c36ef5c40@mail.gmail.com>
Date:	Mon, 6 Aug 2007 17:46:28 -0700
From:	"Ollie Wild" <aaw@...gle.com>
To:	mtk-manpages@....net
Cc:	linux-kernel@...r.kernel.org
Subject: execve manpage changes

Michael,

Per our previous discussion, here are the updates to the execve(2)
manpage resulting from the variable length argument support patch in
linux-2.6.23-rc1.  The execve API is unmodified.  However, the
following should be noted in the "Notes" section.

Prior to linux-2.6.23, the memory used to store the environment and
argument list strings was limited to 32 (MAX_ARG_PAGES) pages.  On
most architectures, the page size is 4kB, leading to a maximum size of
128kB.

In linux-2.6.23 and later, most architectures support a size limit
derived from the current RLIMIT_STACK setting (see getrlimit(2)).  For
these architectures, the total size is limited to 1/4 the allowed
stack size, the limit per string is 32 pages (MAX_ARG_STRLEN), and the
maximum number of strings is 0x7FFFFFFF.  Architectures with no memory
management unit are excepted: they maintain the pre-2.6.23 limit.

Ollie
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