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keyctl.2: Improve KEYCTL_SESSION_TO_PARENT details 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-10-20 14:36:37 +02:00
parent 4887418925
commit 3234dd5f66
1 changed files with 37 additions and 7 deletions
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44
man2/keyctl.2
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@ -1014,17 +1014,32 @@ and
.BR keyctl_get_security_alloc (3). .BR keyctl_get_security_alloc (3).
.TP .TP
.BR KEYCTL_SESSION_TO_PARENT " (since Linux 2.6.32)" .BR KEYCTL_SESSION_TO_PARENT " (since Linux 2.6.32)"
Apply session keyring to parent process. .\" commit ee18d64c1f632043a02e6f5ba5e045bb26a5465f
.IP Replace the session keyring to which the
Attempt to install the calling process's session keyring .I parent
on the process's parent process. of the calling process
subscribes with the session keyring of the calling process.
The keyring will be replaced in the parent process at the point
where the parent next transitions from kernel space to user space.
The keyring must exist and must grant the caller The keyring must exist and must grant the caller
.I link .I link
permission, and the parent process must be single-threaded and have permission.
The parent process must be single-threaded and have
the same effective ownership as this process the same effective ownership as this process
and must not be be set-user-ID or set-group-ID. and must not be be set-user-ID or set-group-ID.
.IP The UID of the parent process's existing session keyring (f it has one),
The keyring will be emplaced on the parent when it next resumes userspace. as well as the UID of the caller's session keyring
much match the caller's effective UID.
The fact that it is the parent process that is affected by this operation
allows a program such as the shell to start a child process that
uses this operation to change the shell's session keyring.
(This is what the
.BR keyctl (1)
.B new_session
command does.)
The arguments The arguments
.IR arg2 , .IR arg2 ,
@ -1368,6 +1383,21 @@ is
.B KEYCTL_UNLINK .B KEYCTL_UNLINK
and the key to be unlinked isn't linked to the keyring. and the key to be unlinked isn't linked to the keyring.
.TP .TP
.B EPERM
.I operation
was
.BR KEYCTL_SESSION_TO_PARENT
and either:
all of the UIDs (GIDs) of the parent process do not match
the effective UID (GID) of the calling process;
the UID of the parent's existing session keyring or
the UID of the caller's session keyring did not match
the effective UID of the caller;
the parent process is not single-thread;
or the parent process is
.BR init (1)
or a kernel thread.
.TP
.B EINVAL .B EINVAL
.I option .I option
is is