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https://github.com/Divested-Mobile/DivestOS-Build.git
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53 lines
2.0 KiB
Diff
53 lines
2.0 KiB
Diff
From 297e6f85ac174825505970e62b4a1f39f84ef3ac Mon Sep 17 00:00:00 2001
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From: Joel Scherpelz <jscherpelz@google.com>
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Date: Wed, 14 Jun 2017 10:27:47 +0900
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Subject: [PATCH] BACKPORT: Avoid netlink socket address conflict
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NetlinkManager previously bound all netlink sockets with nl_pid =
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getpid(). Unfortunately only the first such socket is allowed to claim
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nl_pid = getpid(). The kernel is happy to assign this value
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automatically if nl_pid = 0. For more information on nl_pid see "man 7
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netlink".
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When NFLogListener was added, it created a socket with a kernel assigned
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nl_pid, unfortunately the kernel assigns getpid() to the first such
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socket and listener was initialized earlier in the startup process than
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NetlinkManager.
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This change alters NetlinkManager to request a kernel assigned nl_pid and
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defensively moves the initialization of NFLogListener later in the
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startup sequence to favor proper operation of existing code in
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NetlinkManager. Error logging is also slightly improved.
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Test: as follows
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- built
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- flashed
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- booted
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- "runtest -x .../netd_unit_test.cpp" passes
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- "cts-tradefed run commandAndExit cts-dev -m CtsOsTestCases -t
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android.os.cts.StrictModeTest" passes
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Bug: 62353125
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[syphyr: Removed NFLogListener changes]
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Signed-off-by: L.W. Reek <syphyr@gmail.com>
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Change-Id: I9c1c76e5769de75ff624bf43634ac4061c447a72
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---
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server/NetlinkManager.cpp | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/server/NetlinkManager.cpp b/server/NetlinkManager.cpp
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index 769a80ae..5e6eaba8 100644
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--- a/server/NetlinkManager.cpp
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+++ b/server/NetlinkManager.cpp
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@@ -73,7 +73,8 @@ NetlinkHandler *NetlinkManager::setupSocket(int *sock, int netlinkFamily,
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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- nladdr.nl_pid = getpid();
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+ // Kernel will assign a unique nl_pid if set to zero.
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+ nladdr.nl_pid = 0;
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nladdr.nl_groups = groups;
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if ((*sock = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, netlinkFamily)) < 0) {
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