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| author |   zhong jiang <zhongjiang@huawei.com> | 2016-08-02 14:06:22 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 19:35:31 -0400 |
| commit | 1730f146604ea426e54938cdbcf87df1047ef0dc (patch) | |
| tree | 71502274a92fad2d3503b5bd2d7d12909bdda06e /drivers/rapidio | |
| parent | kexec: allow kdump with crash_kexec_post_notifiers (diff) | |
| download | linux-dev-1730f146604ea426e54938cdbcf87df1047ef0dc.tar.xz linux-dev-1730f146604ea426e54938cdbcf87df1047ef0dc.zip | |
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')
0 files changed, 0 insertions, 0 deletions