fridtjof/qemu-cr16
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

linux-user: fix mremap unmapping adjacent region

Browse source 
This typo meant that calls to `mremap` which shrink a mapping by some N
bytes would, when the virtual address space was pre-reserved (e.g.
32-bit guest on 64-bit host), unmap the N bytes following the *original*
mapping.

Signed-off-by: Matthew Lugg <mlugg@mlugg.co.uk>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20251117170954.31451-2-mlugg@mlugg.co.uk>
(cherry picked from commit aaed9ca1797d70a507371aea688c5cd60b074e2d)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Matthew Lugg 2025-11-17 17:09:51 +00:00 • committed by Michael Tokarev
parent 86ce6e0773
commit a8adf882fd
1 changed files with 2 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
linux-user/mmap.c
View file

@ -1171,7 +1171,8 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
errno = ENOMEM;
host_addr = MAP_FAILED;
} else if (reserved_va && old_size > new_size) {
mmap_reserve_or_unmap(old_addr + old_size,
/* Re-reserve pages we just shrunk out of the mapping */
mmap_reserve_or_unmap(old_addr + new_size,
old_size - new_size);
}
}