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madvise: Support MADV_WIPEONFORK, MADV_KEEPONFORK and MADV_NORMAL

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Change-Id: I1d4cf5affa580d7304dfdc34fa4f1707c0df617c
refs: #1374
This commit is contained in:
TOIDA,Suguru
2020-03-06 15:00:37 +09:00
parent d82ac31bc6
commit 3300e65efc
7 changed files with 131 additions and 2 deletions
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41
kernel/syscall.c
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@ -5324,6 +5324,8 @@ SYSCALL_DECLARE(madvise)
case MADV_REMOVE:
case MADV_DONTDUMP:
case MADV_DODUMP:
case MADV_WIPEONFORK:
case MADV_KEEPONFORK:
break;
case MADV_HWPOISON:
@ -5376,6 +5378,27 @@ SYSCALL_DECLARE(madvise)
}
}
else if(advice == MADV_DONTFORK || advice == MADV_DOFORK);
else if (advice == MADV_NORMAL) {
/*
* Normally, the settings of MADV_RANDOM and
* MADV_SEQUENTIAL are cleared.
* MADV_RANDOM and MADV_SEQUENTIAL are not supported,
* so do nothing.
*/
}
else if (advice == MADV_WIPEONFORK
|| advice == MADV_KEEPONFORK) {
if (range->memobj && memobj_has_pager(range->memobj)) {
/* device mapping, file mapping */
error = -EINVAL;
goto out;
}
if (!(range->flag & VR_PRIVATE)) {
/* VR_SHARED */
error = -EINVAL;
goto out;
}
}
else if (!range->memobj || !memobj_has_pager(range->memobj)) {
dkprintf("[%d]sys_madvise(%lx,%lx,%x):has not pager"
"[%lx-%lx) %lx\n",
@ -5463,6 +5486,24 @@ SYSCALL_DECLARE(madvise)
advice == MADV_DOFORK){
error = syscall_generic_forwarding(__NR_madvise, ctx);
}
if (advice == MADV_WIPEONFORK) {
error = change_attr_process_memory_range(
thread->vm, start, end,
set_memory_range_flag,
VR_WIPEONFORK);
if (error) {
goto out;
}
}
if (advice == MADV_KEEPONFORK) {
error = change_attr_process_memory_range(
thread->vm, start, end,
clear_memory_range_flag,
VR_WIPEONFORK);
if (error) {
goto out;
}
}
error = 0;
out: