diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/termbits.h | 5 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/getdents.c | 45 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/clone.S | 2 |
3 files changed, 32 insertions, 20 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/termbits.h b/sysdeps/unix/sysv/linux/alpha/termbits.h index bcd3ff5d63..d0932c1cd7 100644 --- a/sysdeps/unix/sysv/linux/alpha/termbits.h +++ b/sysdeps/unix/sysv/linux/alpha/termbits.h @@ -17,6 +17,9 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#ifndef _TERMBITS_H +#define _TERMBITS_H 1 + typedef unsigned char cc_t; typedef unsigned int speed_t; typedef unsigned int tcflag_t; @@ -186,3 +189,5 @@ struct termios #define _IOT_termios /* Hurd ioctl type field. */ \ _IOT (_IOTS (cflag_t), 4, _IOTS (cc_t), NCCS, _IOTS (speed_t), 2) + +#endif /* _TERMBITS_H */ diff --git a/sysdeps/unix/sysv/linux/getdents.c b/sysdeps/unix/sysv/linux/getdents.c index 40b31617ef..b4b12d48eb 100644 --- a/sysdeps/unix/sysv/linux/getdents.c +++ b/sysdeps/unix/sysv/linux/getdents.c @@ -49,11 +49,11 @@ struct kernel_dirent /* The problem here is that we cannot simply read the next NBYTES bytes. We need to take the additional field into account. We use - some heuristic. Assume the directory contains names with at least - 3 characters we can compute a maximum number of entries which fit - in the buffer. Taking this number allows us to specify a correct - number of bytes to read. If we should be wrong, we can reset the - file descriptor. */ + some heuristic. Assuming the directory contains names with 14 + characters on average we can compute an estimate number of entries + which fit in the buffer. Taking this number allows us to specify a + correct number of bytes to read. If we should be wrong, we can reset + the file descriptor. */ ssize_t __getdirentries (fd, buf, nbytes, basep) int fd; @@ -62,12 +62,16 @@ __getdirentries (fd, buf, nbytes, basep) off_t *basep; { off_t base = __lseek (fd, (off_t) 0, SEEK_CUR); + off_t last_offset = base; size_t red_nbytes; struct kernel_dirent *skdp, *kdp; struct dirent *dp; int retval; + const size_t size_diff = (offsetof (struct dirent, d_name) + - offsetof (struct kernel_dirent, d_name)); - red_nbytes = nbytes - (nbytes / (offsetof (struct dirent, d_name) + 3)); + red_nbytes = nbytes - ((nbytes / (offsetof (struct dirent, d_name) + 14)) + * size_diff); dp = (struct dirent *) buf; skdp = kdp = __alloca (red_nbytes); @@ -76,26 +80,29 @@ __getdirentries (fd, buf, nbytes, basep) while ((char *) kdp < (char *) skdp + retval) { - const size_t size_diff = MAX (offsetof (struct dirent, d_name) - - offsetof (struct kernel_dirent, d_name), - __alignof__ (struct dirent)); + const size_t alignment = __alignof__ (struct dirent); + /* Since kdp->d_reclen is already aligned for the kernel structure + this may compute a value that is bigger than necessary. */ + size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1) + & ~(alignment - 1)); + if ((char *) dp + new_reclen > buf + nbytes) + { + /* Our heuristic failed. We read too many entries. Reset + the stream. */ + __lseek (fd, last_offset, SEEK_SET); + break; + } + + last_offset = kdp->d_off; dp->d_ino = kdp->d_ino; dp->d_off = kdp->d_off; - dp->d_reclen = kdp->d_reclen + size_diff; + dp->d_reclen = new_reclen; dp->d_type = DT_UNKNOWN; memcpy (dp->d_name, kdp->d_name, kdp->d_reclen - offsetof (struct kernel_dirent, d_name)); - dp = (struct dirent *) (((char *) dp) + dp->d_reclen); + dp = (struct dirent *) ((char *) dp + new_reclen); kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen); - - if ((char *) dp >= buf + nbytes) - { - /* Our heuristic failed. We read too many entries. Reset - the stream. */ - off_t used = ((char *) kdp - (char *) buf) - (nbytes - red_nbytes); - base = __lseek (fd, retval - used, SEEK_CUR); - } } if (basep) diff --git a/sysdeps/unix/sysv/linux/i386/clone.S b/sysdeps/unix/sysv/linux/i386/clone.S index 541ae10f6a..3cdd2dc468 100644 --- a/sysdeps/unix/sysv/linux/i386/clone.S +++ b/sysdeps/unix/sysv/linux/i386/clone.S @@ -38,7 +38,7 @@ ENTRY(__clone) jz syscall_error /* Insert the argument onto the new stack. */ - subl $-8,%ecx + subl $8,%ecx movl 16(%esp),%eax /* no negative argument counts */ movl %eax,4(%ecx) |