Messages in this thread | | | Date | Thu, 24 Jun 2021 08:04:07 +0100 | From | Christoph Hellwig <> | Subject | Re: [BUG] arm64: an infinite loop in generic_perform_write() |
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On Thu, Jun 24, 2021 at 04:24:46AM +0100, Matthew Wilcox wrote: > On Thu, Jun 24, 2021 at 11:10:41AM +0800, Chen Huang wrote: > > In userspace, I perform such operation: > > > > fd = open("/tmp/test", O_RDWR | O_SYNC); > > access_address = (char *)mmap(NULL, uio_size, PROT_READ, MAP_SHARED, uio_fd, 0); > > ret = write(fd, access_address + 2, sizeof(long)); > > ... you know that accessing this at unaligned offsets isn't going to > work. It's completely meaningless. Why are you trying to do it?
We still should not cause an infinite loop in kernel space due to a a userspace programmer error.
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