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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47a9e4d843csm49838232f8f.14.2026.07.09.04.15.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:15:14 -0700 (PDT) Message-ID: <954fe87d-9d43-4819-9f5a-eb0e5e5affea@oss.qualcomm.com> Date: Thu, 9 Jul 2026 13:15:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 03/18] entry: Provide [syscall_]enter_from_user_mode_randomize_stack() Content-Language: en-US To: Thomas Gleixner , LKML Cc: Peter Zijlstra , Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Sven Schnelle , linux-s390@vger.kernel.org, x86@kernel.org, Mark Rutland , Jinjie Ruan , Andy Lutomirski , Oleg Nesterov , Richard Henderson , Russell King , Catalin Marinas , Guo Ren , Geert Uytterhoeven , Thomas Bogendoerfer , Helge Deller , Yoshinori Sato , Richard Weinberger , Chris Zankel , linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, Arnd Bergmann , Vineet Gupta , Will Deacon , Brian Cain , Michal Simek , Dinh Nguyen , "David S. Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?UTF-8?Q?Michal_Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org References: <20260707181957.433213175@kernel.org> <20260707190253.816918647@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.816918647@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX2CxZmA6jzBSF hi5Knalud7Mpyh2SQyRnH8tiMhUq99wHSORgawpVwKZ9u2/a2VBwoYtDkjhScV9csfzNoBQCSFh sOe3EBBhQx3Wvvp5V3gHX7jyBnxBDro= X-Proofpoint-GUID: 2oGFtvDPAd6pZTZEOZ6LGHsk7LmS2-JO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX9nSuBAeWJJQI MfxA3yrjMOzTJwHS8FFrXi6MkCDZarVXXiIB02sZkOAfYmElzOlniKu2Ld5VXjDL/cEu0dfCcj2 AQOxaNA1eqXKOoN+zvy68So1ljO61eOsLGVRahN/xTfXu10i1+ceJg6jn5qls1nkowyAwY7/8Bm 5Xg4IaBTMOcg6bTWit2zmWVD63oZR0SnKwbERLDr8Q0Gh/BzPiqQXSWY7qS0mXvIpMAveQYRqz0 /x9WuhuFQNgHDNFxnUW8Mjwtqm0hk5nKzrvbdVDwr9z4OHdhcNsZJgGxmiFmHI9DMqi+7AcpUkc Q8+6P5Xk5LtVQZpWrt2UHgxT7kxv0yvfdD51MH5rM15nK5xEL+LIt7musiis80TMofOeYk1On/K ePaJbuwBnPeWfZI0ZPkIf3gvRLAeFGrsLBz4Ybp+0G79fwTYRYk0s4sHeyo0/hBgIh3GDY06RVG BCs1W2bkUmQ44QTNxKg== X-Authority-Analysis: v=2.4 cv=Sv2gLvO0 c=1 sm=1 tr=0 ts=6a4f82c4 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=4s3hRJSeHn4rkQlkrse1kQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=vLKI4MkW7k7maJ7H7gsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-ORIG-GUID: 2oGFtvDPAd6pZTZEOZ6LGHsk7LmS2-JO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-09_02,2026-07-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 clxscore=1011 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090108 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260709_041518_157525_2DE914E9 X-CRM114-Status: GOOD ( 14.58 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On 7/7/26 21:06, Thomas Gleixner wrote: > Randomizing the syscall stack can only happen after state is established > via enter_from_user_mode() or syscall_enter_from_user_mode(). The earlier > it happens the better. > > Provide two new macros to consolidate that: > > - enter_from_user_mode_randomize_stack() > enter_from_user_mode(); > add_random_kstack_offset_irqsoff(); > > - syscall_enter_from_user_mode_randomize_stack() > enter_from_user_mode_randomize_stack(); > syscall_enter_from_user_mode_work(); > > to reduce boiler plate code. > > Those are macros and not inline functions as the latter would limit the > stack randomization scope to the inline function itself. > > Signed-off-by: Thomas Gleixner > --- > include/linux/entry-common.h | 56 +++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 56 insertions(+) Reviewed-by: Philippe Mathieu-Daudé