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Date: Mon, 10 Aug 2009 13:03:59 -0400 From: cndougla@...ux.vnet.ibm.com To: netdev@...r.kernel.org Subject: [PATCH] AF_PACKET: Fix PACKET_MMAP on 64-bit kernel/32-bit user systems PACKET_MMAP sets up a ring buffer at a memory location so that kernel and user space can read from it without extra overhead. However, the data is written with a header, struct tpacket_hdr, which begins with an unsigned long field, tp_status. This means in a split 64-bit/32-bit environment the kernel- and user-space reads from the mmap'd region will be different, since in kernel-space the field is 64-bit while in user-space the field is 32-bit. The following patch makes the size of the structure constant by changing the tp_status field to 32-bits. It does not appear to need 64-bits, since only 4-bits are actually used throughout the AF_PACKET code. Signed-off-by: Chase Douglas <cndougla@...ux.vnet.ibm.com> --- a/include/linux/if_packet.h 2009-08-10 16:53:11.000000000 +0000 +++ b/include/linux/if_packet.h 2009-08-10 16:53:28.000000000 +0000 @@ -65,7 +65,7 @@ struct tpacket_auxdata struct tpacket_hdr { - unsigned long tp_status; + unsigned int tp_status; #define TP_STATUS_KERNEL 0 #define TP_STATUS_USER 1 #define TP_STATUS_COPY 2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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