vasilito
dc68054305
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KSTACK_ERASE_H
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#define _LINUX_KSTACK_ERASE_H
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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/*
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* Check that the poison value points to the unused hole in the
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* virtual memory map for your platform.
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*/
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#define KSTACK_ERASE_POISON -0xBEEF
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#define KSTACK_ERASE_SEARCH_DEPTH 128
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#ifdef CONFIG_KSTACK_ERASE
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#include <asm/stacktrace.h>
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#include <linux/linkage.h>
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/*
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* The lowest address on tsk's stack which we can plausibly erase.
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*/
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static __always_inline unsigned long
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stackleak_task_low_bound(const struct task_struct *tsk)
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{
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/*
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* The lowest unsigned long on the task stack contains STACK_END_MAGIC,
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* which we must not corrupt.
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*/
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return (unsigned long)end_of_stack(tsk) + sizeof(unsigned long);
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}
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/*
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* The address immediately after the highest address on tsk's stack which we
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* can plausibly erase.
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*/
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static __always_inline unsigned long
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stackleak_task_high_bound(const struct task_struct *tsk)
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{
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/*
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* The task's pt_regs lives at the top of the task stack and will be
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* overwritten by exception entry, so there's no need to erase them.
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*/
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return (unsigned long)task_pt_regs(tsk);
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}
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/*
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* Find the address immediately above the poisoned region of the stack, where
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* that region falls between 'low' (inclusive) and 'high' (exclusive).
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*/
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static __always_inline unsigned long
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stackleak_find_top_of_poison(const unsigned long low, const unsigned long high)
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{
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const unsigned int depth = KSTACK_ERASE_SEARCH_DEPTH / sizeof(unsigned long);
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unsigned int poison_count = 0;
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unsigned long poison_high = high;
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unsigned long sp = high;
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while (sp > low && poison_count < depth) {
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sp -= sizeof(unsigned long);
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if (*(unsigned long *)sp == KSTACK_ERASE_POISON) {
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poison_count++;
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} else {
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poison_count = 0;
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poison_high = sp;
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}
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}
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return poison_high;
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}
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static inline void stackleak_task_init(struct task_struct *t)
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{
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t->lowest_stack = stackleak_task_low_bound(t);
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# ifdef CONFIG_KSTACK_ERASE_METRICS
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t->prev_lowest_stack = t->lowest_stack;
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# endif
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}
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asmlinkage void noinstr stackleak_erase(void);
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asmlinkage void noinstr stackleak_erase_on_task_stack(void);
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asmlinkage void noinstr stackleak_erase_off_task_stack(void);
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void __no_caller_saved_registers noinstr __sanitizer_cov_stack_depth(void);
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#else /* !CONFIG_KSTACK_ERASE */
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static inline void stackleak_task_init(struct task_struct *t) { }
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#endif
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#endif
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