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linux-user: Fix erroneous conversion in copy_file_range 

The implicit cast from abi_long to size_t may introduce an intermediate
unwanted sign-extension of the value for 32bit targets running on 64bit
hosts.

Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210503174159.54302-3-thatlemon@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Giuseppe Musacchio 2021-05-03 19:41:59 +02:00 committed by Laurent Vivier
parent db3221454d
commit 0fa259dd79
1 changed files with 2 additions and 1 deletions
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3
linux-user/syscall.c
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@ -13244,8 +13244,9 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
}
poutoff = &outoff;
}
/* Do not sign-extend the count parameter. */
ret = get_errno(safe_copy_file_range(arg1, pinoff, arg3, poutoff,
arg5, arg6));
(abi_ulong)arg5, arg6));
if (!is_error(ret) && ret > 0) {
if (arg2) {
if (put_user_u64(inoff, arg2)) {