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| author | Peng Haitao <penght@cn.fujitsu.com> | 2012-11-19 01:53:07 -0500 |
|---|---|---|
| committer | Carlos O'Donell <carlos@systemhalted.org> | 2012-11-19 02:05:12 -0500 |
| commit | f6da27e53695ad1cc0e2a9490358decbbfdff5e5 (patch) | |
| tree | ee71c15d35def733fe7580fa7a5d3a2813ff1a2d /sunrpc | |
| parent | 1f51ee9246b048d8966c36ddd2c26d7e0f927d83 (diff) | |
| download | glibc-f6da27e53695ad1cc0e2a9490358decbbfdff5e5.zip glibc-f6da27e53695ad1cc0e2a9490358decbbfdff5e5.tar.gz glibc-f6da27e53695ad1cc0e2a9490358decbbfdff5e5.tar.bz2 | |
bindresvport() uses two static variables port and startport which are not
protected. It is not safe when in multithread circumstance.
bindresvport() select a port number from the range 512 to 1023, when in
multithread circumstance, the port may be 1024. So the static variables will be
protected.
Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Reviewed-by: Carlos O'Donell <carlos@systemhalted.org>
Diffstat (limited to 'sunrpc')
| -rw-r--r-- | sunrpc/bindrsvprt.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sunrpc/bindrsvprt.c b/sunrpc/bindrsvprt.c index d493c9f..e6a1b0b 100644 --- a/sunrpc/bindrsvprt.c +++ b/sunrpc/bindrsvprt.c @@ -35,6 +35,12 @@ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> +#include <bits/libc-lock.h> + +/* + * Locks the static variables in this file. + */ +__libc_lock_define_initialized (static, lock); /* * Bind a socket to a privileged IP port @@ -74,6 +80,9 @@ bindresvport (int sd, struct sockaddr_in *sin) int nports = ENDPORT - startport + 1; int endport = ENDPORT; + + __libc_lock_lock (lock); + again: for (i = 0; i < nports; ++i) { @@ -94,6 +103,8 @@ bindresvport (int sd, struct sockaddr_in *sin) goto again; } + __libc_lock_unlock (lock); + return res; } libc_hidden_def (bindresvport) |