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Update proc.5 

Since 2011, /proc/pid/mem interface is possible to be written via write(2) syscall:

https://lwn.net/Articles/432347/

https://lwn.net/Articles/433326/

An example where this feature is used is in the Google CTF 2020 "WriteOnly" challenge.
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Peter Teoh 2020-09-11 22:01:14 +08:00 committed by GitHub
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@ -1399,9 +1399,12 @@ Under Linux 2.0, there is no field giving pathname.
This file can be used to access the pages of a process's memory through
.BR open (2),
.BR read (2),
.BR write(2),
and
.BR lseek (2).
.IP
Permission to use the write(2) syscall is allowed only if the caller of write(2) is the parent process of the [pid] to be written.
.IP
Permission to access this file is governed by a ptrace access mode
.B PTRACE_MODE_ATTACH_FSCREDS
check; see