The kernel does not keep the command line for a proc internally. When
it is read from /proc/<pid>/cmdline, the kernel actually maps that pid's
address space and copies the command line and returns it to the reader.
There is no size check. Whatever the exec started with is what is sent
back. Any limitations are either set by the executed app itself (very
doubtful) or the processing downstream from the /proc/<pid>/cmdline
read.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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Process table cant be expanded
https://bugs.launchpad.net/bugs/41928
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