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authorAlexei Starovoitov <ast@fb.com>2017-01-31 05:25:18 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-31 21:28:06 +0300
commit4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b (patch)
tree563b680927dd7b84ab2cd78b35b51c43bd0bb352 /net/core/ethtool.c
parentf8244ab55200dbe074380c3388804adff03a8a19 (diff)
downloadlinux-4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b.tar.xz
net: ethtool: convert large order kmalloc allocations to vzalloc
under memory pressure 'ethtool -S' command may warn: [ 2374.385195] ethtool: page allocation failure: order:4, mode:0x242c0c0 [ 2374.405573] CPU: 12 PID: 40211 Comm: ethtool Not tainted [ 2374.423071] Call Trace: [ 2374.423076] [<ffffffff8148cb29>] dump_stack+0x4d/0x64 [ 2374.423080] [<ffffffff811667cb>] warn_alloc_failed+0xeb/0x150 [ 2374.423082] [<ffffffff81169cd3>] ? __alloc_pages_direct_compact+0x43/0xf0 [ 2374.423084] [<ffffffff8116a25c>] __alloc_pages_nodemask+0x4dc/0xbf0 [ 2374.423091] [<ffffffffa0023dc2>] ? cmd_exec+0x722/0xcd0 [mlx5_core] [ 2374.423095] [<ffffffff811b3dcc>] alloc_pages_current+0x8c/0x110 [ 2374.423097] [<ffffffff81168859>] alloc_kmem_pages+0x19/0x90 [ 2374.423099] [<ffffffff81186e5e>] kmalloc_order_trace+0x2e/0xe0 [ 2374.423101] [<ffffffff811c0084>] __kmalloc+0x204/0x220 [ 2374.423105] [<ffffffff816c269e>] dev_ethtool+0xe4e/0x1f80 [ 2374.423106] [<ffffffff816b967e>] ? dev_get_by_name_rcu+0x5e/0x80 [ 2374.423108] [<ffffffff816d6926>] dev_ioctl+0x156/0x560 [ 2374.423111] [<ffffffff811d4c68>] ? mem_cgroup_commit_charge+0x78/0x3c0 [ 2374.423117] [<ffffffff8169d542>] sock_do_ioctl+0x42/0x50 [ 2374.423119] [<ffffffff8169d9c3>] sock_ioctl+0x1b3/0x250 [ 2374.423121] [<ffffffff811f0f42>] do_vfs_ioctl+0x92/0x580 [ 2374.423123] [<ffffffff8100222b>] ? do_audit_syscall_entry+0x4b/0x70 [ 2374.423124] [<ffffffff8100287c>] ? syscall_trace_enter_phase1+0xfc/0x120 [ 2374.423126] [<ffffffff811f14a9>] SyS_ioctl+0x79/0x90 [ 2374.423127] [<ffffffff81002bb0>] do_syscall_64+0x50/0xa0 [ 2374.423129] [<ffffffff817e19bc>] entry_SYSCALL64_slow_path+0x25/0x25 ~1160 mlx5 counters ~= order 4 allocation which is unlikely to succeed under memory pressure. Convert them to vzalloc() as ethtool_get_regs() does. Also take care of drivers without counters similar to commit 67ae7cf1eeda ("ethtool: Allow zero-length register dumps again") and reduce warn_on to warn_on_once. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/ethtool.c')
-rw-r--r--net/core/ethtool.c39
1 files changed, 22 insertions, 17 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 236a21e3c878..6b3eee0834a0 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1817,11 +1817,13 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
ret = __ethtool_get_sset_count(dev, gstrings.string_set);
if (ret < 0)
return ret;
+ if (ret > S32_MAX / ETH_GSTRING_LEN)
+ return -ENOMEM;
+ WARN_ON_ONCE(!ret);
gstrings.len = ret;
-
- data = kcalloc(gstrings.len, ETH_GSTRING_LEN, GFP_USER);
- if (!data)
+ data = vzalloc(gstrings.len * ETH_GSTRING_LEN);
+ if (gstrings.len && !data)
return -ENOMEM;
__ethtool_get_strings(dev, gstrings.string_set, data);
@@ -1830,12 +1832,13 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
goto out;
useraddr += sizeof(gstrings);
- if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
+ if (gstrings.len &&
+ copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
goto out;
ret = 0;
out:
- kfree(data);
+ vfree(data);
return ret;
}
@@ -1912,14 +1915,15 @@ static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
if (n_stats < 0)
return n_stats;
- WARN_ON(n_stats == 0);
-
+ if (n_stats > S32_MAX / sizeof(u64))
+ return -ENOMEM;
+ WARN_ON_ONCE(!n_stats);
if (copy_from_user(&stats, useraddr, sizeof(stats)))
return -EFAULT;
stats.n_stats = n_stats;
- data = kmalloc(n_stats * sizeof(u64), GFP_USER);
- if (!data)
+ data = vzalloc(n_stats * sizeof(u64));
+ if (n_stats && !data)
return -ENOMEM;
ops->get_ethtool_stats(dev, &stats, data);
@@ -1928,12 +1932,12 @@ static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
if (copy_to_user(useraddr, &stats, sizeof(stats)))
goto out;
useraddr += sizeof(stats);
- if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
+ if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
goto out;
ret = 0;
out:
- kfree(data);
+ vfree(data);
return ret;
}
@@ -1948,17 +1952,18 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
return -EOPNOTSUPP;
n_stats = phy_get_sset_count(phydev);
-
if (n_stats < 0)
return n_stats;
- WARN_ON(n_stats == 0);
+ if (n_stats > S32_MAX / sizeof(u64))
+ return -ENOMEM;
+ WARN_ON_ONCE(!n_stats);
if (copy_from_user(&stats, useraddr, sizeof(stats)))
return -EFAULT;
stats.n_stats = n_stats;
- data = kmalloc_array(n_stats, sizeof(u64), GFP_USER);
- if (!data)
+ data = vzalloc(n_stats * sizeof(u64));
+ if (n_stats && !data)
return -ENOMEM;
mutex_lock(&phydev->lock);
@@ -1969,12 +1974,12 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
if (copy_to_user(useraddr, &stats, sizeof(stats)))
goto out;
useraddr += sizeof(stats);
- if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
+ if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
goto out;
ret = 0;
out:
- kfree(data);
+ vfree(data);
return ret;
}