Messages in this thread | | | Date | Mon, 6 Aug 2007 17:46:28 -0700 | From | "Ollie Wild" <> | Subject | execve manpage changes |
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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.
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