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authorzhong jiang <zhongjiang@huawei.com>2016-08-02 14:06:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-02 19:35:31 -0400
commit1730f146604ea426e54938cdbcf87df1047ef0dc (patch)
tree71502274a92fad2d3503b5bd2d7d12909bdda06e /drivers/rapidio
parentc0253115968c35f3e1ee497282efb75ccf29fb98 (diff)
downloadlinux-stericsson-1730f146604ea426e54938cdbcf87df1047ef0dc.tar.gz
kexec: add restriction on kexec_load() segment sizes
I hit the following issue when run trinity in my system. The kernel is 3.4 version, but mainline has the same issue. The root cause is that the segment size is too large so the kerenl spends too long trying to allocate a page. Other cases will block until the test case quits. Also, OOM conditions will occur. Call Trace: __alloc_pages_nodemask+0x14c/0x8f0 alloc_pages_current+0xaf/0x120 kimage_alloc_pages+0x10/0x60 kimage_alloc_control_pages+0x5d/0x270 machine_kexec_prepare+0xe5/0x6c0 ? kimage_free_page_list+0x52/0x70 sys_kexec_load+0x141/0x600 ? vfs_write+0x100/0x180 system_call_fastpath+0x16/0x1b The patch changes sanity_check_segment_list() to verify that the usage by all segments does not exceed half of memory. [akpm@linux-foundation.org: fix for kexec-return-error-number-directly.patch, update comment] Link: http://lkml.kernel.org/r/1469625474-53904-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Suggested-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Dave Young <dyoung@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio')
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