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Added privilidges

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JimmyBinoculars
2026-02-27 21:04:56 +00:00
parent de161801c4
commit 08cb1db571
12 changed files with 395 additions and 94 deletions
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22
docs/memory-and-allocation.md
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@@ -565,13 +565,21 @@ These statistics are surfaced to the user via the `mem` and `memtest` commands.
## Runtime memory diagnostics (`mem` and `memtest`)
The `mem` command (in `commands.c`) prints a snapshot of PMM and heap state by calling `memory_print_stats`:
The `mem` command (in `commands.c`) prints a snapshot of PMM and heap state by calling `memory_print_stats`. Access requires `TASK_PRIV_KERNEL`:
```525:562:/home/lochlan/Documents/Coding/c/os/memory.c
```525:572:/home/lochlan/Documents/Coding/c/os/memory.c
void memory_print_stats(BootInfo *Boot)
{
UINTN h_total, h_used, h_free, h_blocks;
UINTN p_total, p_free, p_used;
Task *caller;
/* Subsystem-level privilege enforcement: memory stats require KERNEL. */
caller = task_current();
if (caller != NULL && task_get_privilege(caller) < TASK_PRIV_KERNEL) {
SAFE_PRINT(Boot, L"Permission denied: memory stats require kernel privilege.\n\r");
return;
}
p_total = pmm_get_total_pages();
p_free = pmm_get_free_pages();
@@ -590,7 +598,7 @@ void memory_print_stats(BootInfo *Boot)
}
```
The `memtest` command runs a scripted set of tests that exercise heap allocation, heap free/coalescing, and PMM single- and multi-page allocation:
The `memtest` command runs a scripted set of tests that exercise heap allocation, heap free/coalescing, and PMM single- and multi-page allocation. It also enforces `TASK_PRIV_KERNEL`:
```306:379:/home/lochlan/Documents/Coding/c/os/commands.c
static void cmd_memtest(BootInfo *Boot, CHAR16 *Args)
@@ -600,8 +608,16 @@ static void cmd_memtest(BootInfo *Boot, CHAR16 *Args)
UINTN i;
UINT64 page;
UINTN h_total, h_used, h_free, h_blocks;
Task *caller;
(void)Args;
/* Subsystem-level privilege enforcement: memtest requires KERNEL. */
caller = task_current();
if (caller != NULL && task_get_privilege(caller) < TASK_PRIV_KERNEL) {
SAFE_PRINT(Boot, L"Permission denied: memtest requires kernel privilege.\n\r");
return;
}
SAFE_PRINT(Boot, L"\n\r");
SAFE_PRINT(Boot, L"Memory Test\n\r");
SAFE_PRINT(Boot, L"================================================\n\r");