net: Do not allow negative values for busy_read and busy_poll sysctl interfaces

[ Upstream commit 95f255211396958c718aef8c45e3923b5211ea7b ]

This change basically codifies what I think was already the limitations on
the busy_poll and busy_read sysctl interfaces.  We weren't checking the
lower bounds and as such could input negative values. The behavior when
that was used was dependent on the architecture. In order to prevent any
issues with that I am just disabling support for values less than 0 since
this way we don't have to worry about any odd behaviors.

By limiting the sysctl values this way it also makes it consistent with how
we handle the SO_BUSY_POLL socket option since the value appears to be
reported as a signed integer value and negative values are rejected.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index a6beb7b6ae556dff501413d6661d9c4655502e36..f5ef2115871f72b657611c399ab9573dadd71c12 100644 (file)
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -360,14 +360,16 @@ static struct ctl_table net_core_table[] = {
                .data           = &sysctl_net_busy_poll,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
        {
                .procname       = "busy_read",
                .data           = &sysctl_net_busy_read,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
 #endif
 #ifdef CONFIG_NET_SCHED