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author | jmbills <jason.m.bills@intel.com> | 2021-08-03 01:45:08 +0300 |
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committer | GitHub <noreply@github.com> | 2021-08-03 01:45:08 +0300 |
commit | 10ad77d5bc86709d8ff7f95e7040e39f1c153903 (patch) | |
tree | 307cedb87f4c0a329740c55ac364ed489d1d8fc2 /poky/meta/recipes-connectivity/avahi/files/handle-hup.patch | |
parent | c6b1c6ba7a01b7987d65d61c262c44c320193108 (diff) | |
parent | 67327ddc580cb9a85219a534844832a1682780d4 (diff) | |
download | openbmc-10ad77d5bc86709d8ff7f95e7040e39f1c153903.tar.xz |
Update
Diffstat (limited to 'poky/meta/recipes-connectivity/avahi/files/handle-hup.patch')
-rw-r--r-- | poky/meta/recipes-connectivity/avahi/files/handle-hup.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/poky/meta/recipes-connectivity/avahi/files/handle-hup.patch b/poky/meta/recipes-connectivity/avahi/files/handle-hup.patch new file mode 100644 index 000000000..26632e544 --- /dev/null +++ b/poky/meta/recipes-connectivity/avahi/files/handle-hup.patch @@ -0,0 +1,41 @@ +CVE: CVE-2021-3468 +Upstream-Status: Submitted [https://github.com/lathiat/avahi/pull/330] +Signed-off-by: Ross Burton <ross.burton@arm.com> + +From 447affe29991ee99c6b9732fc5f2c1048a611d3b Mon Sep 17 00:00:00 2001 +From: Riccardo Schirone <sirmy15@gmail.com> +Date: Fri, 26 Mar 2021 11:50:24 +0100 +Subject: [PATCH] Avoid infinite-loop in avahi-daemon by handling HUP event in + client_work + +If a client fills the input buffer, client_work() disables the +AVAHI_WATCH_IN event, thus preventing the function from executing the +`read` syscall the next times it is called. However, if the client then +terminates the connection, the socket file descriptor receives a HUP +event, which is not handled, thus the kernel keeps marking the HUP event +as occurring. While iterating over the file descriptors that triggered +an event, the client file descriptor will keep having the HUP event and +the client_work() function is always called with AVAHI_WATCH_HUP but +without nothing being done, thus entering an infinite loop. + +See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984938 +--- + avahi-daemon/simple-protocol.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/avahi-daemon/simple-protocol.c b/avahi-daemon/simple-protocol.c +index 3e0ebb11..6c0274d6 100644 +--- a/avahi-daemon/simple-protocol.c ++++ b/avahi-daemon/simple-protocol.c +@@ -424,6 +424,11 @@ static void client_work(AvahiWatch *watch, AVAHI_GCC_UNUSED int fd, AvahiWatchEv + } + } + ++ if (events & AVAHI_WATCH_HUP) { ++ client_free(c); ++ return; ++ } ++ + c->server->poll_api->watch_update( + watch, + (c->outbuf_length > 0 ? AVAHI_WATCH_OUT : 0) | |