Revision 7ba1b689038726d34e3244c1ac9e2e18c2ea4787 authored by Ralf Baechle on 09 February 2017, 13:12:11 UTC, committed by David S. Miller on 10 February 2017, 18:41:13 UTC
If a USB-to-serial adapter is unplugged, the driver re-initializes, with dev->hard_header_len and dev->addr_len set to zero, instead of the correct values. If then a packet is sent through the half-dead interface, the kernel will panic due to running out of headroom in the skb when pushing for the AX.25 headers resulting in this panic: [<c0595468>] (skb_panic) from [<c0401f70>] (skb_push+0x4c/0x50) [<c0401f70>] (skb_push) from [<bf0bdad4>] (ax25_hard_header+0x34/0xf4 [ax25]) [<bf0bdad4>] (ax25_hard_header [ax25]) from [<bf0d05d4>] (ax_header+0x38/0x40 [mkiss]) [<bf0d05d4>] (ax_header [mkiss]) from [<c041b584>] (neigh_compat_output+0x8c/0xd8) [<c041b584>] (neigh_compat_output) from [<c043e7a8>] (ip_finish_output+0x2a0/0x914) [<c043e7a8>] (ip_finish_output) from [<c043f948>] (ip_output+0xd8/0xf0) [<c043f948>] (ip_output) from [<c043f04c>] (ip_local_out_sk+0x44/0x48) This patch makes mkiss behave like the 6pack driver. 6pack does not panic. In 6pack.c sp_setup() (same function name here) the values for dev->hard_header_len and dev->addr_len are set to the same values as in my mkiss patch. [ralf@linux-mips.org: Massages original submission to conform to the usual standards for patch submissions.] Signed-off-by: Thomas Osterried <thomas@osterried.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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initramfs_data.S
/*
initramfs_data includes the compressed binary that is the
filesystem used for early user space.
Note: Older versions of "as" (prior to binutils 2.11.90.0.23
released on 2001-07-14) dit not support .incbin.
If you are forced to use older binutils than that then the
following trick can be applied to create the resulting binary:
ld -m elf_i386 --format binary --oformat elf32-i386 -r \
-T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
ld -m elf_i386 -r -o built-in.o initramfs_data.o
For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
The above example is for i386 - the parameters vary from architectures.
Eventually look up LDFLAGS_BLOB in an older version of the
arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.
Using .incbin has the advantage over ld that the correct flags are set
in the ELF header, as required by certain architectures.
*/
#include <linux/stringify.h>
#include <asm-generic/vmlinux.lds.h>
.section .init.ramfs,"a"
__irf_start:
.incbin __stringify(INITRAMFS_IMAGE)
__irf_end:
.section .init.ramfs.info,"a"
.globl VMLINUX_SYMBOL(__initramfs_size)
VMLINUX_SYMBOL(__initramfs_size):
#ifdef CONFIG_64BIT
.quad __irf_end - __irf_start
#else
.long __irf_end - __irf_start
#endif
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