linux-kernel - order 4 alloc failures in security_context_to_sid

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Date:	Wed, 2 Jan 2013 10:35:01 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	viro@...iv.linux.org.uk
Subject: order 4 alloc failures in security_context_to_sid_core

Along the same lines as 779302e67835fe9a6b74327e54969ba59cb3478a, xattrs
can cause big allocations, which are likely to fail under memory pressure..

[20539.081122] trinity-child3: page allocation failure: order:4, mode:0x1040d0
[20539.090405] Pid: 27617, comm: trinity-child3 Not tainted 3.8.0-rc1+ #43
[20539.097883] Call Trace:
[20539.105032]  [<ffffffff8113c2ac>] warn_alloc_failed+0xec/0x140
[20539.112549]  [<ffffffff810b882d>] ? trace_hardirqs_on+0xd/0x10
[20539.119609]  [<ffffffff810c02a0>] ? on_each_cpu_mask+0x70/0xd0
[20539.127089]  [<ffffffff81140c2e>] __alloc_pages_nodemask+0x91e/0xba0
[20539.134380]  [<ffffffff81182318>] alloc_pages_current+0xb8/0x180
[20539.141803]  [<ffffffff8113b20a>] __get_free_pages+0x2a/0x80
[20539.149513]  [<ffffffff8118ee1e>] kmalloc_order_trace+0x3e/0x1a0
[20539.157553]  [<ffffffff8100a186>] ? native_sched_clock+0x26/0x90
[20539.164898]  [<ffffffff8118f275>] __kmalloc+0x2f5/0x3a0
[20539.172288]  [<ffffffff812db176>] security_context_to_sid_core+0x86/0x280
[20539.179909]  [<ffffffff813318a8>] ? __const_udelay+0x28/0x30
[20539.187356]  [<ffffffff812c4118>] ? avc_has_perm_flags+0x178/0x2b0
[20539.194911]  [<ffffffff812c3fc9>] ? avc_has_perm_flags+0x29/0x2b0
[20539.202883]  [<ffffffff810b2342>] ? get_lock_stats+0x22/0x70
[20539.211117]  [<ffffffff812dc6d9>] security_context_to_sid+0x19/0x20
[20539.218729]  [<ffffffff812c76f0>] selinux_inode_setxattr+0xf0/0x220
[20539.226502]  [<ffffffff811d42f1>] ? vfs_setxattr+0x71/0xc0
[20539.233517]  [<ffffffff811d42f1>] ? vfs_setxattr+0x71/0xc0
[20539.240734]  [<ffffffff812c18d0>] security_inode_setxattr+0x20/0x30
[20539.248184]  [<ffffffff811d4306>] vfs_setxattr+0x86/0xc0
[20539.255357]  [<ffffffff811d446e>] setxattr+0x12e/0x1d0
[20539.262691]  [<ffffffff813426b5>] ? __percpu_counter_add+0x75/0xc0
[20539.270289]  [<ffffffff811aed33>] ? __sb_start_write+0x103/0x1c0
[20539.277927]  [<ffffffff811cf6a8>] ? mnt_want_write_file+0x28/0x60
[20539.285396]  [<ffffffff8104cc74>] ? do_setitimer+0x1c4/0x300
[20539.292986]  [<ffffffff811cf6a8>] ? mnt_want_write_file+0x28/0x60
[20539.300219]  [<ffffffff811cf592>] ? __mnt_want_write+0x62/0xa0
[20539.307259]  [<ffffffff811d491e>] sys_fsetxattr+0xbe/0xf0
[20539.314184]  [<ffffffff816a4a82>] system_call_fastpath+0x16/0x1b


	Dave

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