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Thu, 14 May 2026 07:14:47 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 14 May 2026 17:21:36 +0300 Message-Id: From: "Matthew Bystrin" To: "Jiakai Xu" , , Cc: "Albert Ou" , "Alexandre Ghiti" , "Chunyan Zhang" , "Matthew Bystrin" , "Palmer Dabbelt" , "Paul Walmsley" , "Samuel Holland" Subject: Re: [PATCH] riscv: stacktrace: fix stack-out-of-bounds in walk_stackframe User-Agent: aerc/0.21.0-0-g5549850facc2 References: <20260514100711.838895-1-xujiakai2025@iscas.ac.cn> In-Reply-To: <20260514100711.838895-1-xujiakai2025@iscas.ac.cn> Hi, Jiakai! Thanks for your valid correction! Jiakai Xu, May 14, 2026 at 13:07: > -static inline int fp_is_valid(unsigned long fp, unsigned long sp) > +static inline int fp_is_valid(unsigned long fp, unsigned long sp, > + struct task_struct *task) > { > unsigned long low, high; > =20 > + if (!task) > + task =3D current; > + I would suggest to move this `if` into walk_stackframe() function in order = to do this only once before walking loop. > low =3D sp + sizeof(struct stackframe); > - high =3D ALIGN(sp, THREAD_SIZE); > + high =3D (unsigned long)task_stack_page(task) + THREAD_SIZE; Also after grepping `task_stack_page` I've noticed that pt_regs structure i= s located at the end of stack. Maybe it is a good idea to adjust border even "lower" to check that sp does not points inside pt_regs? (see task_pt_regs macro) > return !(fp < low || fp > high || fp & 0x07); > } --=20 Best regards, Matt