* Re: WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) [not found] <20090915080953.GA24958@elte.hu> @ 2009-09-15 8:59 ` Eric Dumazet 2009-09-15 9:34 ` Ingo Molnar 0 siblings, 1 reply; 3+ messages in thread From: Eric Dumazet @ 2009-09-15 8:59 UTC (permalink / raw) To: Ingo Molnar Cc: Pekka Enberg, Vegard Nossum, linux-kernel, Linux Netdev List, David S. Miller Ingo Molnar a écrit : > FYI, we still have this one on latest mainline: > > [ 2.159614] NET: Registered protocol family 16 > [ 2.163109] initcall netlink_proto_init+0x0/0x1b0 returned 0 after 5859 usecs > [ 2.164008] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) > [ 2.165006] 0100000002000000000000000000000000000000ad4eaddeffffffffffffffff > [ 2.172006] i i i i i i u u i i i i i i i i i i i i i i i i i i i i i i i i > [ 2.179005] ^ > [ 2.180005] > [ 2.181008] Pid: 1, comm: swapper Not tainted (2.6.31-tip-02389-gc9f313c-dirty #151) > [ 2.182006] EIP: 0060:[<815a8101>] EFLAGS: 00010282 CPU: 0 > [ 2.183009] EIP is at sock_init_data+0xe1/0x210 > [ 2.184006] EAX: 0001b000 EBX: bf855938 ECX: 8233b614 EDX: 819ac7bf > [ 2.185006] ESI: bf855800 EDI: bf438280 EBP: bf867f10 ESP: 81b3afcc > [ 2.186006] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > [ 2.187006] CR0: 8005003b CR2: bf83bdf0 CR3: 01b2c000 CR4: 000006d0 > [ 2.188006] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > [ 2.189006] DR6: ffff4ff0 DR7: 00000400 > [ 2.190005] [<815d82b5>] __netlink_create+0x35/0xa0 > [ 2.192005] [<815dabaa>] netlink_kernel_create+0x5a/0x150 > [ 2.194004] [<815bc8ee>] rtnetlink_net_init+0x1e/0x40 > [ 2.196005] [<815af381>] register_pernet_operations+0x11/0x30 > [ 2.198004] [<815af4be>] register_pernet_subsys+0x1e/0x30 > [ 2.200004] [<81adb49c>] rtnetlink_init+0x4c/0x100 > [ 2.202004] [<81adbfe5>] netlink_proto_init+0x105/0x1b0 > [ 2.204004] [<81001127>] do_one_initcall+0x27/0x190 > [ 2.206004] [<81a9f567>] do_initcalls+0x27/0x40 > [ 2.208004] [<81a9f5a6>] do_basic_setup+0x26/0x30 > [ 2.210004] [<81a9f907>] kernel_init+0x57/0xa0 > [ 2.212004] [<81004867>] kernel_thread_helper+0x7/0x30 > [ 2.214004] [<ffffffff>] 0xffffffff > [ 2.216021] calling bdi_class_init+0x0/0x30 @ 1 > [ 2.217015] device class 'bdi': registering > [ 2.218702] initcall bdi_class_init+0x0/0x30 returned 0 after 976 usecs > [ 2.219041] calling kobject_uevent_init+0x0/0x50 @ 1 > > config attached. > > Ingo > I thought this was already discussed and fixed somehow ? Either we add kmemcheck annotations, or we switch sock->type from short to int to avoid the hole, and possibly to speedup things... [PATCH] net: kmemcheck annotation in struct socket struct socket has a 16 bit hole that triggers kmemcheck warnings. As suggested by Ingo, use kmemcheck annotations Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> --- include/linux/net.h | 5 +++++ net/socket.c | 1 + 2 files changed, 6 insertions(+) diff --git a/include/linux/net.h b/include/linux/net.h index 4fc2ffd..9040a10 100644 --- a/include/linux/net.h +++ b/include/linux/net.h @@ -57,6 +57,7 @@ typedef enum { #include <linux/random.h> #include <linux/wait.h> #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ +#include <linux/kmemcheck.h> struct poll_table_struct; struct pipe_inode_info; @@ -127,7 +128,11 @@ enum sock_shutdown_cmd { */ struct socket { socket_state state; + + kmemcheck_bitfield_begin(type); short type; + kmemcheck_bitfield_end(type); + unsigned long flags; /* * Please keep fasync_list & wait fields in the same cache line diff --git a/net/socket.c b/net/socket.c index 6d47165..2a022c0 100644 --- a/net/socket.c +++ b/net/socket.c @@ -489,6 +489,7 @@ static struct socket *sock_alloc(void) sock = SOCKET_I(inode); + kmemcheck_annotate_bitfield(sock, type); inode->i_mode = S_IFSOCK | S_IRWXUGO; inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) 2009-09-15 8:59 ` WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) Eric Dumazet @ 2009-09-15 9:34 ` Ingo Molnar 2009-09-15 9:39 ` David Miller 0 siblings, 1 reply; 3+ messages in thread From: Ingo Molnar @ 2009-09-15 9:34 UTC (permalink / raw) To: Eric Dumazet Cc: Pekka Enberg, Vegard Nossum, linux-kernel, Linux Netdev List, David S. Miller * Eric Dumazet <eric.dumazet@gmail.com> wrote: > Ingo Molnar a ?crit : > > FYI, we still have this one on latest mainline: > > > > [ 2.159614] NET: Registered protocol family 16 > > [ 2.163109] initcall netlink_proto_init+0x0/0x1b0 returned 0 after 5859 usecs > > [ 2.164008] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) > > [ 2.165006] 0100000002000000000000000000000000000000ad4eaddeffffffffffffffff > > [ 2.172006] i i i i i i u u i i i i i i i i i i i i i i i i i i i i i i i i > > [ 2.179005] ^ > > [ 2.180005] > > [ 2.181008] Pid: 1, comm: swapper Not tainted (2.6.31-tip-02389-gc9f313c-dirty #151) > > [ 2.182006] EIP: 0060:[<815a8101>] EFLAGS: 00010282 CPU: 0 > > [ 2.183009] EIP is at sock_init_data+0xe1/0x210 > > [ 2.184006] EAX: 0001b000 EBX: bf855938 ECX: 8233b614 EDX: 819ac7bf > > [ 2.185006] ESI: bf855800 EDI: bf438280 EBP: bf867f10 ESP: 81b3afcc > > [ 2.186006] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > [ 2.187006] CR0: 8005003b CR2: bf83bdf0 CR3: 01b2c000 CR4: 000006d0 > > [ 2.188006] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > > [ 2.189006] DR6: ffff4ff0 DR7: 00000400 > > [ 2.190005] [<815d82b5>] __netlink_create+0x35/0xa0 > > [ 2.192005] [<815dabaa>] netlink_kernel_create+0x5a/0x150 > > [ 2.194004] [<815bc8ee>] rtnetlink_net_init+0x1e/0x40 > > [ 2.196005] [<815af381>] register_pernet_operations+0x11/0x30 > > [ 2.198004] [<815af4be>] register_pernet_subsys+0x1e/0x30 > > [ 2.200004] [<81adb49c>] rtnetlink_init+0x4c/0x100 > > [ 2.202004] [<81adbfe5>] netlink_proto_init+0x105/0x1b0 > > [ 2.204004] [<81001127>] do_one_initcall+0x27/0x190 > > [ 2.206004] [<81a9f567>] do_initcalls+0x27/0x40 > > [ 2.208004] [<81a9f5a6>] do_basic_setup+0x26/0x30 > > [ 2.210004] [<81a9f907>] kernel_init+0x57/0xa0 > > [ 2.212004] [<81004867>] kernel_thread_helper+0x7/0x30 > > [ 2.214004] [<ffffffff>] 0xffffffff > > [ 2.216021] calling bdi_class_init+0x0/0x30 @ 1 > > [ 2.217015] device class 'bdi': registering > > [ 2.218702] initcall bdi_class_init+0x0/0x30 returned 0 after 976 usecs > > [ 2.219041] calling kobject_uevent_init+0x0/0x50 @ 1 > > > > config attached. > > > > Ingo > > > > I thought this was already discussed and fixed somehow ? yes, it looked familar. > Either we add kmemcheck annotations, or we switch sock->type from short > to int to avoid the hole, and possibly to speedup things... > > [PATCH] net: kmemcheck annotation in struct socket > > struct socket has a 16 bit hole that triggers kmemcheck warnings. > > As suggested by Ingo, use kmemcheck annotations > > Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> > --- > include/linux/net.h | 5 +++++ > net/socket.c | 1 + > 2 files changed, 6 insertions(+) Acked-by: Ingo Molnar <mingo@elte.hu> Ingo ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) 2009-09-15 9:34 ` Ingo Molnar @ 2009-09-15 9:39 ` David Miller 0 siblings, 0 replies; 3+ messages in thread From: David Miller @ 2009-09-15 9:39 UTC (permalink / raw) To: mingo; +Cc: eric.dumazet, penberg, vegard.nossum, linux-kernel, netdev From: Ingo Molnar <mingo@elte.hu> Date: Tue, 15 Sep 2009 11:34:40 +0200 > > * Eric Dumazet <eric.dumazet@gmail.com> wrote: > >> Either we add kmemcheck annotations, or we switch sock->type from short >> to int to avoid the hole, and possibly to speedup things... >> >> [PATCH] net: kmemcheck annotation in struct socket >> >> struct socket has a 16 bit hole that triggers kmemcheck warnings. >> >> As suggested by Ingo, use kmemcheck annotations >> >> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> >> --- >> include/linux/net.h | 5 +++++ >> net/socket.c | 1 + >> 2 files changed, 6 insertions(+) > > Acked-by: Ingo Molnar <mingo@elte.hu> Applied, thanks everyone. ^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-09-15 8:59 ` WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (bf438284) Eric Dumazet
2009-09-15 9:34 ` Ingo Molnar
2009-09-15 9:39 ` David Miller
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