Revision a57b70519d1f7c53be98478623652738e5ac70d5 authored by Liam Howlett on 18 October 2022, 19:17:12 UTC, committed by Andrew Morton on 21 October 2022, 04:27:23 UTC
mmap should return the start address of newly mapped area when successful. On a successful merge of a VMA, the return address was changed and thus was violating that expectation from userspace. This is a restoration of functionality provided by 309d08d9b3a3 (mm/mmap.c: fix mmap return value when vma is merged after call_mmap()). For completeness of fixing MAP_FIXED, implement the comments from the previous discussion to never update the address and fail if the address changes. Leaving the error as a WARN_ON() to avoid crashing the kernel. Link: https://lkml.kernel.org/r/20221018191613.4133459-1-Liam.Howlett@oracle.com Link: https://lore.kernel.org/all/Y06yk66SKxlrwwfb@lakrids/ Link: https://lore.kernel.org/all/20201203085350.22624-1-liuzixian4@huawei.com/ Fixes: 4dd1b84140c1 ("mm/mmap: use advanced maple tree API for mmap_region()") Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Reported-by: Mark Rutland <mark.rutland@arm.com> Cc: Liu Zixian <liuzixian4@huawei.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
1 parent 1cd916d
File | Mode | Size |
---|---|---|
apple-aic.h | -rw-r--r-- | 414 bytes |
arm-gic.h | -rw-r--r-- | 536 bytes |
aspeed-scu-ic.h | -rw-r--r-- | 886 bytes |
irq-st.h | -rw-r--r-- | 713 bytes |
irq.h | -rw-r--r-- | 611 bytes |
irqc-rzg2l.h | -rw-r--r-- | 550 bytes |
mips-gic.h | -rw-r--r-- | 246 bytes |
mvebu-icu.h | -rw-r--r-- | 357 bytes |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...