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43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
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From 1b5b4c951c4f5d5495ab6acb98c586b85d123295 Mon Sep 17 00:00:00 2001
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From: Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
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Date: Fri, 11 Jan 2013 17:14:26 +0100
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Subject: [PATCH 02/15] FOC: change l4_task_cap_equal semantic
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The syscall l4_task_cap_equal almost returns false although the referenced
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kernel-objects are equal. This patch changes the semantic of the syscall so that
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whenever two capabilities refering the same kernel-object are compared it will
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return true. Please refer to the discussion of the following mail thread:
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http://www.mail-archive.com/l4-hackers@os.inf.tu-dresden.de/msg05162.html
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Was 'foc_caps_equal.patch'
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---
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kernel/fiasco/src/kern/task.cpp | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/kernel/fiasco/src/kern/task.cpp b/kernel/fiasco/src/kern/task.cpp
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index 693da581..e30867e2 100644
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--- a/kernel/fiasco/src/kern/task.cpp
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+++ b/kernel/fiasco/src/kern/task.cpp
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@@ -518,10 +518,15 @@ Task::sys_caps_equal(Syscall_frame *, Utcb *utcb)
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if (obj_a.special() || obj_b.special())
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return commit_result(obj_a.special_cap() == obj_b.special_cap());
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- Obj_space::Capability c_a = lookup(obj_a.cap());
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- Obj_space::Capability c_b = lookup(obj_b.cap());
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+ Kobject_iface* ki_a = lookup(obj_a.cap()).obj();
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+ Kobject_iface* ki_b = lookup(obj_b.cap()).obj();
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- return commit_result(c_a == c_b);
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+ if (!ki_b || !ki_a) return commit_result(0);
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+
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+ Mword o_a = ki_a->obj_id();
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+ Mword o_b = ki_b->obj_id();
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+
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+ return commit_result(o_a == o_b);
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}
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PRIVATE inline NOEXPORT
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--
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2.11.0
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