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include/exec: Change reserved_va semantics to last byte

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Change the semantics to be the last byte of the guest va, rather
than the following byte.  This avoids some overflow conditions.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-03-06 01:26:29 +03:00
parent a3a67f54f0
commit 95059f9c31
7 changed files with 38 additions and 34 deletions
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4
linux-user/mmap.c
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@ -283,7 +283,7 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
end_addr = start + size;
if (start > reserved_va - size) {
/* Start at the top of the address space. */
end_addr = ((reserved_va - size) & -align) + size;
end_addr = ((reserved_va + 1 - size) & -align) + size;
looped = true;
}
@ -297,7 +297,7 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
return (abi_ulong)-1;
}
/* Re-start at the top of the address space. */
addr = end_addr = ((reserved_va - size) & -align) + size;
addr = end_addr = ((reserved_va + 1 - size) & -align) + size;
looped = true;
} else {
prot = page_get_flags(addr);