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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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10
bsd-user/main.c
View file

@ -68,13 +68,9 @@ bool have_guest_base;
# if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
# if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
(TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
/*
* There are a number of places where we assign reserved_va to a variable
* of type abi_ulong and expect it to fit. Avoid the last page.
*/
# define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
# define MAX_RESERVED_VA 0xfffffffful
# else
# define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
# define MAX_RESERVED_VA ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
# endif
# else
# define MAX_RESERVED_VA 0
@ -466,7 +462,7 @@ int main(int argc, char **argv)
envlist_free(envlist);
if (reserved_va) {
mmap_next_start = reserved_va;
mmap_next_start = reserved_va + 1;
}
{