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authorRichard Guy Briggs <rgb@redhat.com>2014-12-18 23:09:27 -0500
committerPaul Moore <pmoore@redhat.com>2014-12-19 18:37:56 -0500
commit54dc77d974a50147d6639dac6f59cb2c29207161 (patch)
tree972f87c0e22f190f3f2d23d84acfaa611a87b449 /kernel/audit.c
parent3640dcfa4fd00cd91d88bb86250bdb496f7070c0 (diff)
downloadlinux-sh-54dc77d974a50147d6639dac6f59cb2c29207161.tar.gz
audit: use supplied gfp_mask from audit_buffer in kauditd_send_multicast_skb
Eric Paris explains: Since kauditd_send_multicast_skb() gets called in audit_log_end(), which can come from any context (aka even a sleeping context) GFP_KERNEL can't be used. Since the audit_buffer knows what context it should use, pass that down and use that. See: https://lkml.org/lkml/2014/12/16/542 BUG: sleeping function called from invalid context at mm/slab.c:2849 in_atomic(): 1, irqs_disabled(): 0, pid: 885, name: sulogin 2 locks held by sulogin/885: #0: (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff91152e30>] prepare_bprm_creds+0x28/0x8b #1: (tty_files_lock){+.+.+.}, at: [<ffffffff9123e787>] selinux_bprm_committing_creds+0x55/0x22b CPU: 1 PID: 885 Comm: sulogin Not tainted 3.18.0-next-20141216 #30 Hardware name: Dell Inc. Latitude E6530/07Y85M, BIOS A15 06/20/2014 ffff880223744f10 ffff88022410f9b8 ffffffff916ba529 0000000000000375 ffff880223744f10 ffff88022410f9e8 ffffffff91063185 0000000000000006 0000000000000000 0000000000000000 0000000000000000 ffff88022410fa38 Call Trace: [<ffffffff916ba529>] dump_stack+0x50/0xa8 [<ffffffff91063185>] ___might_sleep+0x1b6/0x1be [<ffffffff910632a6>] __might_sleep+0x119/0x128 [<ffffffff91140720>] cache_alloc_debugcheck_before.isra.45+0x1d/0x1f [<ffffffff91141d81>] kmem_cache_alloc+0x43/0x1c9 [<ffffffff914e148d>] __alloc_skb+0x42/0x1a3 [<ffffffff914e2b62>] skb_copy+0x3e/0xa3 [<ffffffff910c263e>] audit_log_end+0x83/0x100 [<ffffffff9123b8d3>] ? avc_audit_pre_callback+0x103/0x103 [<ffffffff91252a73>] common_lsm_audit+0x441/0x450 [<ffffffff9123c163>] slow_avc_audit+0x63/0x67 [<ffffffff9123c42c>] avc_has_perm+0xca/0xe3 [<ffffffff9123dc2d>] inode_has_perm+0x5a/0x65 [<ffffffff9123e7ca>] selinux_bprm_committing_creds+0x98/0x22b [<ffffffff91239e64>] security_bprm_committing_creds+0xe/0x10 [<ffffffff911515e6>] install_exec_creds+0xe/0x79 [<ffffffff911974cf>] load_elf_binary+0xe36/0x10d7 [<ffffffff9115198e>] search_binary_handler+0x81/0x18c [<ffffffff91153376>] do_execveat_common.isra.31+0x4e3/0x7b7 [<ffffffff91153669>] do_execve+0x1f/0x21 [<ffffffff91153967>] SyS_execve+0x25/0x29 [<ffffffff916c61a9>] stub_execve+0x69/0xa0 Cc: stable@vger.kernel.org #v3.16-rc1 Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Tested-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Signed-off-by: Paul Moore <pmoore@redhat.com>
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index f3a981db91ff..c7e097a0d7af 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -429,7 +429,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
* This function doesn't consume an skb as might be expected since it has to
* copy it anyways.
*/
-static void kauditd_send_multicast_skb(struct sk_buff *skb)
+static void kauditd_send_multicast_skb(struct sk_buff *skb, gfp_t gfp_mask)
{
struct sk_buff *copy;
struct audit_net *aunet = net_generic(&init_net, audit_net_id);
@@ -448,11 +448,11 @@ static void kauditd_send_multicast_skb(struct sk_buff *skb)
* no reason for new multicast clients to continue with this
* non-compliance.
*/
- copy = skb_copy(skb, GFP_KERNEL);
+ copy = skb_copy(skb, gfp_mask);
if (!copy)
return;
- nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, GFP_KERNEL);
+ nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, gfp_mask);
}
/*
@@ -1949,7 +1949,7 @@ void audit_log_end(struct audit_buffer *ab)
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
nlh->nlmsg_len = ab->skb->len;
- kauditd_send_multicast_skb(ab->skb);
+ kauditd_send_multicast_skb(ab->skb, ab->gfp_mask);
/*
* The original kaudit unicast socket sends up messages with