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build fix: fix build issue with latest gcc for blkrescan
With latest gcc version 9.1.1 20190506 from Clear Linux, we hit following build issue in blkrescan code: In function ‘strncpy’, inlined from ‘blkrescan_vm’ at acrn_vm_ops.c:468:2: /usr/include/bits/string_fortified.h:106:10: error: \ ‘__builtin___strncpy_chk’ specified bound depends on the length \ of the source argument [-Werror=stringop-overflow=] When calling strncpy, the size n should be set to max dest size instead of src size. Tracked-On: #3096 Signed-off-by: Yin Fengwei <fengwei.yin@intel.com> Acked-by: Yan, Like <like.yan@intel.com>
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@ -465,7 +465,8 @@ int blkrescan_vm(const char *vmname, char *devargs)
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req.magic = MNGR_MSG_MAGIC;
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req.msgid = DM_BLKRESCAN;
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req.timestamp = time(NULL);
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strncpy(req.data.devargs, devargs, strlen(devargs)+1);
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strncpy(req.data.devargs, devargs, PARAM_LEN - 1);
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req.data.devargs[PARAM_LEN - 1] = '\0';
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send_msg(vmname, &req, &ack);
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