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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2017-03-24 09:38:03 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-24 15:02:13 -0700 |
| commit | 95f255211396958c718aef8c45e3923b5211ea7b (patch) | |
| tree | 791f0b88ce95b744e509912f7cb5a7a4a60701ce /net | |
| parent | 9f47a48e6eb97d793db85373e3ef4c55d876d334 (diff) | |
| download | linux-stable-95f255211396958c718aef8c45e3923b5211ea7b.tar.gz linux-stable-95f255211396958c718aef8c45e3923b5211ea7b.tar.bz2 linux-stable-95f255211396958c718aef8c45e3923b5211ea7b.zip | |
net: Do not allow negative values for busy_read and busy_poll sysctl interfaces
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sysctl_net_core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index 4ead336e14ea..7f9cc400eca0 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -408,14 +408,16 @@ 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 |