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syscall: fixed mincore(2) not failing with ENOMEM 

The current implementation of the mincore(2) syscall sets errno to
EFAULT when the region identified by the first two parameters is
invalid.

This goes against the man page specification, where mincore(2) should
only fail with EFAULT when the third parameter is an invalid address;
and fail with ENOMEM when the checked region does not point to mapped
memory.

Signed-off-by: Franklin "Snaipe" Mathieu <snaipe@diacritic.io>
Cc: Riku Voipio <riku.voipio@linaro.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20170217085800.28873-2-snaipe@diacritic.io>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Franklin \"Snaipe\" Mathieu 2017-02-17 08:58:00 +00:00 committed by Laurent Vivier
parent 59ebb6e451
commit 98a3331a55
1 changed files with 8 additions and 3 deletions
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11
linux-user/syscall.c
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@ -11194,11 +11194,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
case TARGET_NR_mincore:
{
void *a;
ret = -TARGET_ENOMEM;
a = lock_user(VERIFY_READ, arg1, arg2, 0);
if (!a) {
goto fail;
}
ret = -TARGET_EFAULT;
if (!(a = lock_user(VERIFY_READ, arg1,arg2, 0)))
goto efault;
if (!(p = lock_user_string(arg3)))
p = lock_user_string(arg3);
if (!p) {
goto mincore_fail;
}
ret = get_errno(mincore(a, arg2, p));
unlock_user(p, arg3, ret);
mincore_fail: