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However, because inode numbers are reused, a clever attacker can still exploit a race condition in this code First, the attacker uses a signal to suspend the victim process immediately after the call to lstat(), deletes the file in question, and waits for the file s inode to be reassigned to another file on the same device Then the attacker creates a link to the new file and restarts the program The check will succeed, but the filename will now refer to the file the attacker linked with the same inode It might take a long time for the numbers to be reassigned to a file that the attacker finds interesting, but once the program is suspended, the attacker can wait as long as it takes Figure 125 shows a possible ordering of the code from Example 1210 The best way to prevent TOCTOU vulnerabilities that lead to both cryogenic sleep attacks and between functions that operate only on symbolic filenames is to store relevant files in a safe directory that only your program can access First create a directory that is completely under the control of the user ID that will operate on the files; then walk up the directory tree to the root, verifying that each directory is writeable only by root and the current user ID, and that none of the directories is a link Example 1211 demonstrates a reference implementation of a safe_dir() function from Building Secure Software that performs these steps [Viega and McGraw Race Conditions, 2002] An easier solution is to put sensitive files on a separate device that only your program can access, but this limits your program to running only on machines with the necessary configuration

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The rst two methods transform the point parameter by this transform and place the result into pointOut The last two methods transform the point parameter by this transform and place the result back into point In both cases, the fourth element of the point input parameter is assumed to be 1

public public public public final final final final void void void void transform(Vector3d transform(Vector3f transform(Vector3d transform(Vector3f normal, Vector3d normalOut) normal, Vector3f normalOut) normal) normal)

victim Time 0: Time 1: Time 2: Time 3: Time 4: Time 5: Time 6: Time 7: Time 8: = open( /tmp/f ) fstat( /tmp/f ) 1stat( /tmp/f ) creat("/tmp/f") kill(victim_pid, SIGSTOP) stat( /tmp/f , &s) remove( /tmp/f ) symlink( new_file , /tmp/f ) kill(victim_pid, SIGCONT) attacker

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The rst two methods transforms the normal parameter by this transform and place the value into normalOut The third and fourth methods transform the normal parameter by this transform and place the value back into normal 71271 View Model Compatibility Mode Methods: Viewing Matrix

Example 1211 Implementation of safe_dir(), which creates a safe directory completely under the control of the current user ID

public void lookAt(Point3d eye, Point3d center, Vector3d up)

This is a utility method that speci es the position and orientation of a viewing transformation It works very much like the similar function in OpenGL The inverse of this transform can be used to control the ViewPlatform object within the scene graph Alternatively, this transform can be passed directly to the View s VpcToEc transform via the compatibility mode viewing functions de ned in Section C112, Using the Camera-based View Model

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static char safe_dir(char *dir, uid_t owner_uid) { char newdir[PATH_MAX+1]; int cur = open("", O_RDONLY); struct stat linf, sinf; int fd; if(cur == -1) { return 1; } if(lstat(dir, &linf) == 1) { close(cur); return 2; } do { chdir(dir); if((fd = open("", O_RDONLY)) == 1) { fchdir(cur); close(cur); return 3; } if(fstat(fd, &sinf) == 1) { fchdir(cur); close(cur); close(fd); return 4; } close(fd);

When closing and reopening a secondary window during a single application session, reopen that window where it was when it closed most recently (Alert boxes are an exception Always reopen an alert box at its initial position)

Version 11 Alpha 01, February 27, 1998

if(linfst_mode != sinfst_mode || linfst_ino != sinfst_ino || linfst_dev != sinfst_dev) { fchdir(cur); close(cur); return 5; } if((sinfst_mode & (S_IWOTH|S_IWGRP)) || (sinfst_uid && (sinfst_uid != owner_uid))) { fchdir(cur); close(cur); return 6; } dir = ""; if(lstat(dir, &linf) == 1) { fchdir(cur); close(cur); } return 7; if(!getcwd(new_dir, PATH_MAX+1)) { fchdir(cur); close(cur); return 8; } } while(strcmp(new_dir, "/")); fchdir(cur); close(cur); return 0; }

public void frustum(double left, double right, double bottom, double top, double near, double far) public void perspective(double fovx, double aspect, double zNear, double zFar) public void ortho(double left, double right, double bottom, double top, double near, double far)

These three utility methods allow an application to create a perspective or parallel (orthographic) projection matrix These three methods work very much like the similar functions in OpenGL The resulting Transform3D can be used to directly set the View s left and right projection transforms when in compatibility mode See Section C112, Using the Camera-based View Model, for details The fovx parameter speci es the eld of view in the x direction in radians

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how to write pdf file in asp.net c#

how to write pdf file in asp.net c#

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