Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=91ad997a34d7abca1f04e819e31eb9f3d4e20585
Commit: 91ad997a34d7abca1f04e819e31eb9f3d4e20585
Parent: 20a1022d4ac5c53f0956006fd9e30cf4846d5e58
Author: Serge E. Hallyn <[EMAIL PROTECTED]>
AuthorDate: Wed Nov 14 17:00:34 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Nov 14 18:45:44 2007 -0800
file capabilities: allow sigcont within session
Fix http://bugzilla.kernel.org/show_bug.cgi?id=9247
Allow sigcont to be sent to a process with greater capabilities if it is in
the same session. Otherwise, a shell from which I've started a root shell
and done 'suspend' can't be restarted by the parent shell.
Also don't do file-capabilities signaling checks when uids for the
processes don't match, since the standard check_kill_permission will have
done those checks.
[EMAIL PROTECTED]: coding-style cleanups]
Signed-off-by: Serge E. Hallyn <[EMAIL PROTECTED]>
Acked-by: Andrew Morgan <[EMAIL PROTECTED]>
Cc: Chris Wright <[EMAIL PROTECTED]>
Tested-by: "Theodore Ts'o" <[EMAIL PROTECTED]>
Cc: Stephen Smalley <[EMAIL PROTECTED]>
Cc: "Rafael J. Wysocki" <[EMAIL PROTECTED]>
Cc: Chris Wright <[EMAIL PROTECTED]>
Cc: James Morris <[EMAIL PROTECTED]>
Cc: Stephen Smalley <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
security/commoncap.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/security/commoncap.c b/security/commoncap.c
index bf67871..302e8d0 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -526,6 +526,10 @@ int cap_task_kill(struct task_struct *p, struct siginfo
*info,
if (info != SEND_SIG_NOINFO && (is_si_special(info) ||
SI_FROMKERNEL(info)))
return 0;
+ /* sigcont is permitted within same session */
+ if (sig == SIGCONT && (task_session_nr(current) == task_session_nr(p)))
+ return 0;
+
if (secid)
/*
* Signal sent as a particular user.
-
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