d890e8b3e3
Alternative title: Replace get_process_cmdline()'s fopen()/fread() with read_full_virtual_file(). When RLIMIT_STACK is set to infinity:infinity, _SC_ARG_MAX will return 4611686018427387903 (depending on the system, but definitely something larger than most systems have). It's impractical to allocate this in one go when most cmdlines are much shorter than that. Instead use read_full_virtual_file() which seems to increase the buffer depending on the size of the contents. (cherry picked from commit 7b7a060e83d6c7de8705904d71978ba4664f0a65) (cherry picked from commit fca334fb072545e2db8a81a51f8d1ab343fb610f)
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