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kernel/vm: Enforce more area protection restrictions.

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Most notably in vm_resize_area, but also a missed one in transfer_area.
Solves TODOs.
This commit is contained in:
Augustin Cavalier
2024-12-16 14:16:58 -05:00
parent e52dd571d9
commit 9a2e367eae
1 changed files with 13 additions and 8 deletions
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src/system/kernel/vm/vm.cpp
+13 -8
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@@ -3091,6 +3091,7 @@ vm_set_area_protection(team_id team, area_id areaID, uint32 newProtection,
cacheLocker.SetTo(cache, true); // already locked
// enforce restrictions
if (!kernel && (area->address_space == VMAddressSpace::Kernel()
|| (area->protection & B_KERNEL_AREA) != 0)) {
dprintf("vm_set_area_protection: team %" B_PRId32 " tried to "
@@ -3107,10 +3108,9 @@ vm_set_area_protection(team_id team, area_id areaID, uint32 newProtection,
area->protection_max, areaID, area->name);
return B_NOT_ALLOWED;
}
if (team != VMAddressSpace::KernelID()
&& area->address_space->ID() != team) {
// unless you're the kernel, you are only allowed to set
// unless you're the kernel, you're only allowed to set
// the protection of your own areas
return B_NOT_ALLOWED;
}
@@ -4917,14 +4917,18 @@ vm_resize_area(area_id areaID, size_t newSize, bool kernel)
cacheLocker.SetTo(cache, true); // already locked
// enforce restrictions
const team_id team = team_get_current_team_id();
if (!kernel && (area->address_space == VMAddressSpace::Kernel()
|| (area->protection & B_KERNEL_AREA) != 0)) {
dprintf("vm_resize_area: team %" B_PRId32 " tried to "
"resize kernel area %" B_PRId32 " (%s)\n",
team_get_current_team_id(), areaID, area->name);
team, areaID, area->name);
return B_NOT_ALLOWED;
}
if (!kernel && area->address_space->ID() != team) {
// unless you're the kernel, you're only allowed to resize your own areas
return B_NOT_ALLOWED;
}
// TODO: Enforce all restrictions (team, etc.)!
oldSize = area->Size();
if (newSize == oldSize)
@@ -5831,8 +5835,11 @@ transfer_area(area_id id, void** _address, uint32 addressSpec, team_id target,
if (status != B_OK)
return status;
if (!kernel && info.team != thread_get_current_thread()->team->id)
return B_PERMISSION_DENIED;
// enforce restrictions
if (!kernel && (info.team != team_get_current_team_id()
|| (info.protection & B_KERNEL_AREA) != 0)) {
return B_NOT_ALLOWED;
}
// We need to mark the area cloneable so the following operations work.
status = set_area_protection(id, info.protection | B_CLONEABLE_AREA);
@@ -6050,8 +6057,6 @@ _user_set_area_protection(area_id area, uint32 newProtection)
status_t
_user_resize_area(area_id area, size_t newSize)
{
// TODO: Since we restrict deleting of areas to those owned by the team,
// we should also do that for resizing (check other functions, too).
return vm_resize_area(area, newSize, false);
}