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Thu, 6 Aug 2026 04:16:23 +0000 (GMT) From: Madhavan Srinivasan To: mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, mchauras@linux.ibm.com, msuchanek@suse.de, sshegde@linux.ibm.com, david@kernel.org, thuth@redhat.com, agordeev@linux.ibm.com, mark.rutland@arm.com, ruanjinjie@huawei.com, ryan.roberts@arm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Mukesh Kumar Chaurasiya (IBM)" Subject: Re: [PATCH V6] powerpc/syscall: Fix syscall skip handling for seccomp and ptrace Date: Thu, 6 Aug 2026 09:46:22 +0530 Message-ID: <178598971874.942627.7409142497641761431.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260731081521.1852133-1-mkchauras@gmail.com> References: <20260731081521.1852133-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYwODA2MDAyNSBTYWx0ZWRfX2TZbWJ4H5CoS W2RVa+LEq1HVUk3Hosh1l5SyuEP2mfLHoS5p2cxsl7v5+HVKk34b3YLYYQiW7pGX9zADwZclIWS cBDTEXfojynMcjpRUIvYCMPXoaoEbLQ= X-Authority-Analysis: v=2.4 cv=I7VVgtgg c=1 sm=1 tr=0 ts=6a740aa0 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=-_iW5eXQ-KMzy3zx3P0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA2MDAyNSBTYWx0ZWRfX5zD5vgWuVLKw O6On3xGlH6AQn8rlR8yCegFgMjUwrea9mceSuVff2pQdVBDiyGHvCQTFz7kgI/KpMWn+sph8EYg SAjy8YWLygUkTOulXp/J+ABTsaU8UB9iYmlugL6HUUy8XQ91Ak3OajJh4N4NHmQcPSI0Dp3MBGi EADQVcvalvSOr3dQhG2s6OFOgaKlYO/yzCNU137cUp0zoQVXFhCp31BMTeinVunGI1E0/HybVo+ ziHrtu/H1+KAYFBNcbyAgmzUYoFqZ/NElRNu1JWxUVfOW61oBB5xn0Acc4FFLSYE/0vcv9eFLt6 QDPdaoSyau4gtCGwwmurCfMSnIv2+Vj2ZVkihTFxpPvBFMidKVa/d5u0mIHL76tZ+oMR5LJOm+t yXxQTOsTuGJaCvhj42F+FVPGyDjtAF39QZKs4EjvIBLLpX1yrhxYDuvu1m6WPszjVPAsm3Kgwfp 8MAmgGsx56eTmvzhQrQ== X-Proofpoint-ORIG-GUID: mRM5pqkHG7QuiLj8P2UQop-8OKEwEJq8 X-Proofpoint-GUID: dg0sfg-lZHYOM7YkynkT148DqFtLnSfr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-05_06,2026-08-05_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1011 priorityscore=1501 suspectscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608060025 On Fri, 31 Jul 2026 13:45:21 +0530, Mukesh Kumar Chaurasiya (IBM) wrote: > After enabling GENERIC_ENTRY on PowerPC, syscall_enter_from_user_mode() > returns -1 as a sentinel to signal that seccomp or ptrace has intercepted > the syscall and already set a return value via syscall_set_return_value(). > system_call_exception() was not handling this sentinel, and since -1UL > is >= NR_syscalls, the code fell into the out-of-range path and returned > -ENOSYS, overwriting the errno already placed in regs->gpr[3]. > > [...] Applied to powerpc/next. [1/1] powerpc/syscall: Fix syscall skip handling for seccomp and ptrace https://git.kernel.org/powerpc/c/69cb2be898be6d5826cacd1a628f6945a24480b6 cheers