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charset="utf-8" In 050a1ba, when moving the macros from preprocessor-guarding to file-based definition, TARGET_O_LARGEFILE appeared to have been accidentally left off. This may have correctness implication, but so far I was only confused by strace's output. Fixes: 050a1ba69a ("linux-user: move arm/aarch64/m68k fcntl definitions to = [arm|aarch64|m68k]/target_fcntl.h") Signed-off-by: Shu-Chun Weng Reviewed-by: Laurent Vivier --- linux-user/aarch64/target_fcntl.h | 1 + 1 file changed, 1 insertion(+) diff --git a/linux-user/aarch64/target_fcntl.h b/linux-user/aarch64/target_= fcntl.h index efdf6e5f05..55ab788a7c 100644 --- a/linux-user/aarch64/target_fcntl.h +++ b/linux-user/aarch64/target_fcntl.h @@ -11,6 +11,7 @@ #define TARGET_O_DIRECTORY 040000 /* must be a directory */ #define TARGET_O_NOFOLLOW 0100000 /* don't follow links */ #define TARGET_O_DIRECT 0200000 /* direct disk access hint */ +#define TARGET_O_LARGEFILE 0400000 =20 #include "../generic/fcntl.h" #endif From nobody Wed Nov 27 00:28:54 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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Fri, 08 Dec 2023 12:50:11 -0800 (PST) Date: Fri, 8 Dec 2023 12:49:51 -0800 In-Reply-To: <20231208204951.552837-1-scw@google.com> Message-Id: <20231208204951.552837-3-scw@google.com> Mime-Version: 1.0 References: <20231208204951.552837-1-scw@google.com> X-Mailer: git-send-email 2.43.0.472.g3155946c3a-goog Subject: [PATCH v2 2/2] linux-user: Fix openat() emulation to not modify atime From: Shu-Chun Weng To: qemu-devel@nongnu.org Cc: Laurent Vivier , Richard Henderson , Shu-Chun Weng Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::114a; envelope-from=3g4FzZQMKCoY2m6qyyqvo.myw0ow4-no5ovxyxqx4.y1q@flex--scw.bounces.google.com; helo=mail-yw1-x114a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_TEMPERROR=0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1702068669032100003 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit b8002058 strengthened openat()'s /proc detection by calling realpath(3) on the given path, which allows various paths and symlinks that points to the /proc file system to be intercepted correctly. Using realpath(3), though, has a side effect that it reads the symlinks along the way, and thus changes their atime. The results in the following code snippet already get ~now instead of the real atime: int fd =3D open("/path/to/a/symlink", O_PATH | O_NOFOLLOW); struct stat st; fstat(fd, st); return st.st_atime; This change opens a path that doesn't appear to be part of /proc directly and checks the destination of /proc/self/fd/n to determine if it actually refers to a file in /proc. Neither this nor the existing code works with symlinks or indirect paths (e.g. /tmp/../proc/self/exe) that points to /proc/self/exe because it is itself a symlink, and both realpath(3) and /proc/self/fd/n will resolve into the location of QEMU. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2004 Signed-off-by: Shu-Chun Weng --- linux-user/syscall.c | 47 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 9 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index e384e14248..7c3772301f 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8308,8 +8308,7 @@ static int open_net_route(CPUArchState *cpu_env, int = fd) int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *fname, int flags, mode_t mode, bool safe) { - g_autofree char *proc_name =3D NULL; - const char *pathname; + g_autofree char *pathname =3D NULL; struct fake_open { const char *filename; int (*fill)(CPUArchState *cpu_env, int fd); @@ -8334,12 +8333,42 @@ int do_guest_openat(CPUArchState *cpu_env, int dirf= d, const char *fname, { NULL, NULL, NULL } }; =20 - /* if this is a file from /proc/ filesystem, expand full name */ - proc_name =3D realpath(fname, NULL); - if (proc_name && strncmp(proc_name, "/proc/", 6) =3D=3D 0) { - pathname =3D proc_name; + if (strncmp(fname, "/proc/", 6) =3D=3D 0) { + pathname =3D g_strdup(fname); } else { - pathname =3D fname; + g_autofree char *proc_name =3D NULL; + struct stat proc_stat; + int fd; + + if (safe) { + fd =3D safe_openat(dirfd, path(fname), flags, mode); + } else { + fd =3D openat(dirfd, path(fname), flags, mode); + } + if (fd < 0) { + return fd; + } + + /* + * Try to get the real path of the file we just opened. We avoid c= alling + * `realpath(3)` because it calls `readlink(2)` on symlinks which + * changes their atime. Note that since `/proc/self/exe` is a syml= ink, + * `pathname` will never resolve to it (neither will `realpath(3)`= ). + * That's why we check `fname` against the "/proc/" prefix first. + */ + proc_name =3D g_strdup_printf("/proc/self/fd/%d", fd); + if (lstat(proc_name, &proc_stat) < 0 || !S_ISLNK(proc_stat.st_mode= )) { + /* No procfs or something weird. Not going to dig further. */ + return fd; + } + pathname =3D g_new(char, proc_stat.st_size + 1); + readlink(proc_name, pathname, proc_stat.st_size + 1); + + /* if this is not a file from /proc/ filesystem, the fd is good as= -is */ + if (strncmp(pathname, "/proc/", 6) !=3D 0) { + return fd; + } + close(fd); } =20 if (is_proc_myself(pathname, "exe")) { @@ -8390,9 +8419,9 @@ int do_guest_openat(CPUArchState *cpu_env, int dirfd,= const char *fname, } =20 if (safe) { - return safe_openat(dirfd, path(pathname), flags, mode); + return safe_openat(dirfd, pathname, flags, mode); } else { - return openat(dirfd, path(pathname), flags, mode); + return openat(dirfd, pathname, flags, mode); } }