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vsnprintf returns the number of chars that would have been written, not
the actual number of chars written. This can lead to crashlog_buf->len
being too big which in turn can lead to get_maxlen() returning negative
numbers. The length argument of kmsg_dump_get_buffer will be casted to
a size_t which makes a negative input a big positive number allowing
kmsg_dump_get_buffer to write out of bounds.
Fix this by using vscnprintf which returns the actually written number
of chars.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37820 3c298f89-4303-0410-b956-a3cf2f4a3e73
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It causes NULL pointer dereference:
[ 0.638235] __ioremap(): phys addr 0x7f00000 is RAM lr c025d61c
[ 0.644090] Unable to handle kernel paging request for data at address 0x00000000
[ 0.651533] Faulting instruction address: 0xc025d620
[ 0.656483] Oops: Kernel access of bad area, sig: 11 [#1]
[ 0.661856] P1010 RDB
[ 0.664113] Modules linked in:
[ 0.667152] NIP: c025d620 LR: c025d61c CTR: c000dc38
[ 0.672101] REGS: c7831ef0 TRAP: 0300 Not tainted (3.3.8)
[ 0.677740] MSR: 00029000 <CE,EE,ME> CR: 42022082 XER: 20000000
[ 0.683817] DEAR: 00000000, ESR: 00000000
[ 0.687811] TASK = c782c000[1] 'swapper' THREAD: c7830000
[ 0.693017] GPR00: a1ee0000 c7831fa0 c782c000 00000000 0000214c ffffffff c7831ea6 0001ffff
[ 0.701350] GPR08: c03697cc c035fba0 c03697cc c0360000 42022022 00000000 00000000 00000000
[ 0.709682] GPR16: c0000a00 00000014 3fffffff 00ffa000 00000015 07fc42bc c0360000 00000000
[ 0.718015] GPR24: 00000000 00000000 00001680 c0360000 00000000 c025d5e8 c0390000 c038b824
[ 0.726535] NIP [c025d620] crashlog_init_fs+0x38/0xd8
[ 0.731560] LR [c025d61c] crashlog_init_fs+0x34/0xd8
[ 0.736503] Call Trace:
[ 0.738939] [c7831fa0] [c025d61c] crashlog_init_fs+0x34/0xd8 (unreliable)
[ 0.745712] [c7831fb0] [c0001e98] do_one_initcall+0xd4/0x198
[ 0.751357] [c7831fe0] [c02537f4] kernel_init+0x9c/0x120
[ 0.756647] [c7831ff0] [c000c2dc] kernel_thread+0x4c/0x68
[ 0.762022] Instruction dump:
[ 0.764975] 3860fff4 bfc10008 3fc0c039 90010014 3bfeb824 801f0004 2f800000 41be00a0
[ 0.772699] 7c030378 38804000 4bdb38cd 3c00a1ee <81630000> 6000dead 7c691b78 907eb824
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35435 3c298f89-4303-0410-b956-a3cf2f4a3e73
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This is crashing the kernel in crashlog_init_fs(), until fixed, disable it
for SPARC too.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34213 3c298f89-4303-0410-b956-a3cf2f4a3e73
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Fixes this section mismatch warning:
WARNING: vmlinux.o(.meminit.text+0xb14): Section mismatch in reference
from the function memblock_insert_region() to the function
.init.text:crashlog_init_memblock()
The function __meminit memblock_insert_region() references
a function __init crashlog_init_memblock().
If crashlog_init_memblock is only used by memblock_insert_region then
annotate crashlog_init_memblock with a matching annotation.
Also, remove the __init annotations from 'include/linux/crashlog.h'
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33137 3c298f89-4303-0410-b956-a3cf2f4a3e73
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It is currently badly broken on ARM, until fixed, disable it
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32926 3c298f89-4303-0410-b956-a3cf2f4a3e73
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32787 3c298f89-4303-0410-b956-a3cf2f4a3e73
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Based on 3.3-rc2
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29986 3c298f89-4303-0410-b956-a3cf2f4a3e73
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