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Cc: kexec@lists.infradead.org
Subject: Re: [PATCH v5 12/17] crash: Fix TOCTOU race in crash memory range collection
Date: Fri, 18 Sep 2026 10:34:10 +0000 [thread overview]
Message-ID: <20260918103411.5E8601F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260918100442.3841135-13-ruanjinjie@huawei.com>
> The crash kernel ELF core header construction counts system memory
> ranges via `arch_get_system_nr_ranges()`, allocates the crash_mem
> buffer, and then populates it via `arch_crash_populate_cmem()`.
> This sequence has a time-of-check-to-time-of-use (TOCTOU) race with
> memory hotplug: a concurrent hotplug event between the count
> and populate steps can increase the number of ranges beyond the allocated
> capacity, causing an out-of-bounds write. If the event triggers
> memblock_double_array(), the memblock array can be freed and reallocated
> during iteration, leading to a use-after-free.
>
> Protect the entire range collection with device_hotplug_lock. Since
> the hotplug notification path already holds that lock, add a lockless
> helper, crash_get_memory_ranges_nolock(), for use there. The regular
> crash_get_memory_ranges() acquires the lock and calls the helper.
>
> [ ... ]
> Fixes: 3751e728cef2 ("arm64: kexec_file: add crash dump support")
> Fixes: 8acea455fafa ("RISC-V: Support for kexec_file on panic")
> Fixes: 1bcca8620a91 ("LoongArch: Add crash dump support for kexec_file")
> Link: https://sashiko.dev/#/patchset/20260729031235.2840255-1-ruanjinjie%40huawei.com
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260918100442.3841135-1-ruanjinjie@huawei.com?part=12
next prev parent reply other threads:[~2026-09-18 10:34 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 10:04 [PATCH v5 00/17] crash: Rework and add arm64 crash hotplug support Jinjie Ruan
2026-09-18 10:04 ` [PATCH v5 01/17] kexec: Fix CMA segment address translation with non-zero text_offset Jinjie Ruan
2026-09-18 10:22 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 02/17] kexec: Record allocated CMA pages to fix release size mismatch Jinjie Ruan
2026-09-18 10:16 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 03/17] kexec: Extract kexec_free_segment_cma() from kimage_free_cma() Jinjie Ruan
2026-09-18 10:18 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 04/17] arm64: kexec_file: Fix CMA page leaks in segment placement retry loops Jinjie Ruan
2026-09-18 10:15 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 05/17] arm64: kexec_file: Fix elf_headers memory leak in retry loop Jinjie Ruan
2026-09-18 10:16 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 06/17] LoongArch: kexec_file: Fix CMA page leaks in segment placement retry loops Jinjie Ruan
2026-09-18 10:16 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 07/17] LoongArch: kexec_file: Fix elf_headers memory leak in retry loop Jinjie Ruan
2026-09-18 10:21 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 08/17] LoongArch: kexec_file: Fix a modified_cmdline leak Jinjie Ruan
2026-09-18 10:18 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 09/17] x86/crash: Fix massive out-of-bounds write on 32-bit Highmem Jinjie Ruan
2026-09-18 10:16 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 10/17] crash: Extract crash_get_memory_ranges() helper Jinjie Ruan
2026-09-18 10:11 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 11/17] crash: Normalize the kexec_load elfcorehdr at load time Jinjie Ruan
2026-09-18 10:27 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 12/17] crash: Fix TOCTOU race in crash memory range collection Jinjie Ruan
2026-09-18 10:34 ` sashiko-bot [this message]
2026-09-18 10:04 ` [PATCH v5 13/17] crash: Assert device_hotplug_lock in crash_get_memory_ranges_nolock() Jinjie Ruan
2026-09-18 10:26 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 14/17] elf: Introduce elf64_phdr_size() helper Jinjie Ruan
2026-09-18 10:25 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 15/17] crash: Introduce crash_extra_elfcorehdr_size() helper Jinjie Ruan
2026-09-18 10:31 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 16/17] arm64: kexec_file: Simplify load_other_segments() Jinjie Ruan
2026-09-18 10:27 ` sashiko-bot
2026-09-18 10:04 ` [PATCH v5 17/17] arm64: crash: Add crash hotplug support Jinjie Ruan
2026-09-18 10:36 ` sashiko-bot
2026-09-18 10:41 ` [PATCH v5 00/17] crash: Rework and add arm64 " Breno Leitao
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