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bsd-user/mmap.c: assert that target_mprotect cannot fail 

Similar to the equivalent linux-user change 86abac06c1. All error
conditions that target_mprotect checks are also checked by target_mmap.
EACCESS cannot happen because we are just removing PROT_WRITE.  ENOMEM
should not happen because we are modifying a whole VMA (and we have
bigger problems anyway if it happens).

Fixes a Coverity false positive, where Coverity complains about
target_mprotect's return value being passed to tb_invalidate_phys_range.

Signed-off-by: Mikaël Urankar <mikael.urankar@gmail.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
This commit is contained in:
Warner Losh 2021-09-17 09:16:54 -06:00
parent 0fc76b6859
commit 91a5adda15
1 changed files with 1 additions and 4 deletions
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5
bsd-user/mmap.c
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@ -604,10 +604,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
}
if (!(prot & PROT_WRITE)) {
ret = target_mprotect(start, len, prot);
if (ret != 0) {
start = ret;
goto the_end;
}
assert(ret == 0);
}
goto the_end;
}