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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.227.15.19; envelope-from=deller@gmx.de; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 deller@gmx.de) X-ZM-MESSAGEID: 1690901961410100003 Content-Type: text/plain; charset="utf-8" In qemu we catch accesses to files like /proc/cpuinfo or /proc/net/route and return to the guest contents which would be visible on a real system (instead what the host would show). This patch fixes a bug, where for example the accesses cat /proc////cpuinfo or cd /proc && cat cpuinfo will not be recognized by qemu and where qemu will wrongly show the contents of the host's /proc/cpuinfo file. Signed-off-by: Helge Deller diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 917c388073..bb864c2bb3 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8531,9 +8531,11 @@ static int open_cpuinfo(CPUArchState *cpu_env, int f= d) } #endif -int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, +int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *fname, int flags, mode_t mode, bool safe) { + char proc_name[PATH_MAX]; + const char *pathname; struct fake_open { const char *filename; int (*fill)(CPUArchState *cpu_env, int fd); @@ -8560,6 +8562,13 @@ int do_guest_openat(CPUArchState *cpu_env, int dirfd= , const char *pathname, { NULL, NULL, NULL } }; + /* if this is a file from /proc/ filesystem, expand full name */ + if (realpath(fname, proc_name) && strncmp(proc_name, "/proc/", 6) =3D= =3D 0) { + pathname =3D proc_name; + } else { + pathname =3D fname; + } + if (is_proc_myself(pathname, "exe")) { if (safe) { return safe_openat(dirfd, exec_path, flags, mode);