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process_vm_readv.2: Rephrase permission rules in terms of a ptrace access mode check 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-06-11 12:04:26 +02:00
parent b02b4b74d5
commit 408c8172e4
1 changed files with 5 additions and 13 deletions
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18
man2/process_vm_readv.2
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@ -209,19 +209,11 @@ entry.
The first read entry goes up to the page boundary,
while the second starts on the next page boundary.)
In order to read from or write to another process,
either the caller must have the capability
.BR CAP_SYS_PTRACE ,
or
the real user ID, effective user ID, and saved set-user-ID
of the remote process must match the real user ID of the caller
.I and
the real group ID, effective group ID, and saved set-group-ID
of the remote process must match the real group ID of the caller.
(The permission required is exactly the same as that required to perform a
.BR ptrace (2)
.BR PTRACE_ATTACH
on the remote process.)
Permission to read from or write to another process
is governed by a ptrace access mode
.B PTRACE_MODE_ATTACH_REALCREDS
check; see
.BR ptrace (2).
.SH RETURN VALUE
On success,
.BR process_vm_readv ()