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b=MNcTfu51HAjp9arjwyGN1MZppN/dC3Ih6DC5avMnmUZvCl1H8KMvBU/ZZwYPTddlq 8PnPW4CSFGBN1dDKTDcBXSBShP3a2WX5Pp6p0nXP7btknLRFB9PL8Ncjca4QfFR7o6 oieIQ42NP3xLduOm0i3X+wXP5Uc/isojnKGZtzQxRcqeCltZdRDFH+n0KxLYl41RIP ATkNXn2O63ucMGLH8txRIYQC8ZLHJgxM0FFautSGCwD/y0R1M9Jy2DlUyf0qiqgXBM VIcI6Y0C/5lhKqfM+6+0N06nY7P1BiHq8y1ifirsgXbr9GMfqL0sos0ji0uQdTtER0 P0SLP3MDfXv8g== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH RESEND v2 20/23] selftests/proc: check that a mapped entry can be removed Reply-To: sashiko-reviews@lists.linux.dev To: "Christian Brauner" Cc: "Linus Torvalds" , "Jann Horn" , "Josef Bacik" , "Chris Mason" , "Jeff Layton" , NeilBrown , "Eric Dumazet" , "Thomas Gleixner" , "Al Viro" , "Jonathan Corbet" , "Christoph Hellwig" , "Greg Kroah-Hartman" , "Joel Granados" , "Kees Cook" , "Jan Kara" , "Jan Kara" , linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-serial@vger.kernel.org, "Takashi Iwai" , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, "Chuck Lever" , tytso@mit.edu, dmitry.torokhov@gmail.com, "Petr Pavlu" , "Anna Schumaker" , yukuai@fygo.io, "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" In-Reply-To: <20261104-work-procfs-core-v2-20-76ace653a773@kernel.org> References: <20261104-work-procfs-core-v2-0-76ace653a773@kernel.org> <20261104-work-procfs-core-v2-20-76ace653a773@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 05 Nov 2026 19:35:54 +0000 X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: ajyxpd4du846a9bh4us4t699zetgowbf X-Rspamd-Queue-Id: D2D5B160002 X-Rspam-User: X-HE-Tag: 1793907357-912703 X-HE-Meta: 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 UJ4rdz4z 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: Thank you for your contribution! Sashiko AI review found 2 potential issue(= s) to consider: - [Medium] selftests/proc: 32-bit off_t truncation in proc-remove-mapped mm= ap() - [Low] selftests/proc: unused len parameter in mem_bar() in proc-remove-ma= pped -- commit df303f424b9a370ffbd0eec6c07ff2a99d0ee4ea Author: Christian Brauner selftests/proc: check that a mapped entry can be removed This commit adds a procfs selftest that maps a PCI device memory BAR via /proc/bus/pci and removes the PCI device through sysfs to verify that remov= ing a mapped procfs entry does not block and leaves the file returning -EIO on subsequent reads. > diff --git a/tools/testing/selftests/proc/proc-remove-mapped.c b/tools/te= sting/selftests/proc/proc-remove-mapped.c > new file mode 100644 > index 0000000000000..92860fb2a8f40 > --- /dev/null > +++ b/tools/testing/selftests/proc/proc-remove-mapped.c [ ... ] > +/* the first memory BAR of @dev */ > +static int mem_bar(const char *dev, unsigned long long *start, > + unsigned long long *len) > +{ > + unsigned long long s, e, flags; > + char path[PATH_MAX]; > + int ret =3D -ENODEV; > + FILE *f; > + > + snprintf(path, sizeof(path), SYSFS_DEVICES "%s/resource", dev); > + f =3D fopen(path, "r"); > + if (!f) > + return -errno; > + while (fscanf(f, "%llx %llx %llx", &s, &e, &flags) =3D=3D 3) { > + if ((flags & IORESOURCE_MEM) && e >=3D s) { > + *start =3D s; > + *len =3D e - s + 1; > + ret =3D 0; > + break; > + } > + } > + fclose(f); > + return ret; > +} [ ... ] > +TEST_F(pci, remove_while_mapped) > +{ > + long psz =3D sysconf(_SC_PAGESIZE); > + unsigned long long start =3D 0, len =3D 0; > + char path[PATH_MAX]; > + volatile unsigned int *p; > + unsigned int v; > + int fd; > + > + if (mem_bar(self->dev, &start, &len)) > + SKIP(return, "%s has no memory BAR", self->dev); [Severity: Low] This isn't a bug, but is the len parameter in mem_bar() needed? mem_bar() writes *len =3D e - s + 1 and remove_while_mapped() passes &len, but len is never read afterward because mmap() maps a single page of size psz. > + > + fd =3D open(self->path, O_RDONLY | O_CLOEXEC); > + ASSERT_GE(fd, 0); > + if (ioctl(fd, PCIIOC_MMAP_IS_MEM)) { > + /* no PCI mmap on this architecture, or locked down */ > + if (errno =3D=3D EINVAL || errno =3D=3D EPERM) { > + close(fd); > + SKIP(return, "PCIIOC_MMAP_IS_MEM: %s", strerror(errno)); > + } > + ASSERT_TRUE(false) { > + TH_LOG("PCIIOC_MMAP_IS_MEM: %s", strerror(errno)); > + } > + } > + p =3D mmap(NULL, psz, PROT_READ, MAP_SHARED, fd, start); > + if (p =3D=3D MAP_FAILED) > + SKIP(return, "mmap: %s", strerror(errno)); [Severity: Medium] On 32-bit architectures, will passing start to mmap() in remove_while_mappe= d() truncate or sign-extend PCI BAR addresses at or above 0x80000000? Neither proc-remove-mapped.c nor tools/testing/selftests/proc/Makefile defi= nes _FILE_OFFSET_BITS to 64, so off_t is a 32-bit signed integer on 32-bit buil= ds. When mem_bar() parses a BAR physical address >=3D 0x80000000 into unsigned = long long start, converting start to a 32-bit signed off_t in mmap() either truncates bits above 32 or produces a negative offset (which fails with EIN= VAL in musl, or sign-extends the page offset passed to mmap2 in glibc so pci_mmap_fits() in proc_bus_pci_mmap() fails with ENODEV and causes the test to skip). Should proc-remove-mapped.c define _FILE_OFFSET_BITS 64 before including the system headers? --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261104-work-procf= s-core-v2-0-76ace653a773@kernel.org?part=3D20