e2fsprogs/*: remove ioctl calling obfuscation
function old new delta change_attributes 326 416 +90 list_attributes 222 248 +26 close_silently 22 - -22 .rodata 103722 103692 -30 fgetsetversion 74 - -74 fgetsetprojid 107 - -107 fgetsetflags 148 - -148 ------------------------------------------------------------------------------ (add/remove: 0/4 grow/shrink: 2/1 up/down: 116/-381) Total: -265 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
e7ff017a1a
commit
96436fb36a
@ -61,9 +61,9 @@
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#define OPT_SET_PROJ (1 << 4)
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struct globals {
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unsigned long version;
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unsigned long af;
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unsigned long rf;
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unsigned version;
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unsigned af;
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unsigned rf;
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int flags;
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uint32_t projid;
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smallint recursive;
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@ -79,7 +79,7 @@ static unsigned long get_flag(char c)
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static char** decode_arg(char **argv, struct globals *gp)
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{
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unsigned long *fl;
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unsigned *fl;
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const char *arg = *argv;
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char opt = *arg;
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@ -149,7 +149,8 @@ static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, vo
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static void change_attributes(const char *name, struct globals *gp)
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{
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unsigned long fsflags;
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unsigned fsflags;
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int fd;
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struct stat st;
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if (lstat(name, &st) != 0) {
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@ -166,33 +167,50 @@ static void change_attributes(const char *name, struct globals *gp)
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if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
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return;
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if (gp->flags & OPT_SET_VER)
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if (fsetversion(name, gp->version) != 0)
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bb_perror_msg("setting %s on %s", "version", name);
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fd = open_or_warn(name, O_RDONLY | O_NONBLOCK); /* neither read nor write asked for */
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if (fd >= 0) {
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int r;
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if (gp->flags & OPT_SET_PROJ)
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if (fsetprojid(name, gp->projid) != 0)
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bb_perror_msg("setting %s on %s", "project ID", name);
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if (gp->flags & OPT_SET) {
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fsflags = gp->af;
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} else {
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if (fgetflags(name, &fsflags) != 0) {
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bb_perror_msg("reading flags on %s", name);
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goto skip_setflags;
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if (gp->flags & OPT_SET_VER) {
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r = ioctl(fd, EXT2_IOC_SETVERSION, &gp->version);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "version", name);
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}
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/*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
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fsflags &= ~gp->rf;
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/*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
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fsflags |= gp->af;
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// What is this? And why it's not done for SET case?
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if (!S_ISDIR(st.st_mode))
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fsflags &= ~EXT2_DIRSYNC_FL;
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}
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if (fsetflags(name, fsflags) != 0)
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bb_perror_msg("setting flags on %s", name);
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if (gp->flags & OPT_SET_PROJ) {
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struct ext2_fsxattr fsxattr;
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r = ioctl(fd, EXT2_IOC_FSGETXATTR, &fsxattr);
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if (r != 0)
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bb_perror_msg("getting %s on %s", "project ID", name);
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fsxattr.fsx_projid = gp->projid;
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r = ioctl(fd, EXT2_IOC_FSSETXATTR, &fsxattr);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "project ID", name);
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}
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if (gp->flags & OPT_SET) {
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fsflags = gp->af;
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} else {
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r = ioctl(fd, EXT2_IOC_GETFLAGS, &fsflags);
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if (r != 0) {
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bb_perror_msg("getting %s on %s", "flags", name);
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goto skip_setflags;
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}
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/*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
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fsflags &= ~gp->rf;
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/*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
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fsflags |= gp->af;
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// What is this? And why it's not done for SET case?
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if (!S_ISDIR(st.st_mode))
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fsflags &= ~EXT2_DIRSYNC_FL;
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}
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r = ioctl(fd, EXT2_IOC_SETFLAGS, &fsflags);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "flags", name);
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skip_setflags:
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close(fd);
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}
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if (gp->recursive && S_ISDIR(st.st_mode))
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iterate_on_dir(name, chattr_dir_proc, gp);
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}
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@ -8,8 +8,6 @@
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#include "libbb.h"
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#include "e2fs_lib.h"
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#define HAVE_EXT2_IOCTLS 1
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#if INT_MAX == LONG_MAX
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#define IF_LONG_IS_SAME(...) __VA_ARGS__
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#define IF_LONG_IS_WIDER(...)
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@ -18,14 +16,6 @@
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#define IF_LONG_IS_WIDER(...) __VA_ARGS__
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#endif
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static void close_silently(int fd)
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{
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int e = errno;
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close(fd);
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errno = e;
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}
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/* Iterate a function on each entry of a directory */
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int iterate_on_dir(const char *dir_name,
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int FAST_FUNC (*func)(const char *, struct dirent *, void *),
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@ -45,113 +35,6 @@ int iterate_on_dir(const char *dir_name,
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return 0;
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}
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/* Get/set a file version on an ext2 file system */
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int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version)
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{
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#if HAVE_EXT2_IOCTLS
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int fd, r;
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IF_LONG_IS_WIDER(unsigned ver;)
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fd = open(name, O_RDONLY | O_NONBLOCK);
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if (fd == -1)
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return -1;
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if (!get_version) {
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IF_LONG_IS_WIDER(
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ver = (unsigned) set_version;
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r = ioctl(fd, EXT2_IOC_SETVERSION, &ver);
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)
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IF_LONG_IS_SAME(
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r = ioctl(fd, EXT2_IOC_SETVERSION, (void*)&set_version);
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)
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} else {
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IF_LONG_IS_WIDER(
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r = ioctl(fd, EXT2_IOC_GETVERSION, &ver);
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*get_version = ver;
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)
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IF_LONG_IS_SAME(
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r = ioctl(fd, EXT2_IOC_GETVERSION, (void*)get_version);
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)
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}
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close_silently(fd);
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return r;
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#else /* ! HAVE_EXT2_IOCTLS */
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errno = EOPNOTSUPP;
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return -1;
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#endif /* ! HAVE_EXT2_IOCTLS */
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}
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int fgetsetprojid(const char *name, uint32_t *get, uint32_t set)
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{
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#if HAVE_EXT2_IOCTLS
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struct ext2_fsxattr fsxattr;
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int fd, r;
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fd = open(name, O_RDONLY | O_NONBLOCK);
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if (fd == -1)
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return -1;
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r = ioctl(fd, EXT2_IOC_FSGETXATTR, &fsxattr);
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/* note: ^^^ may fail in 32-bit userspace on 64-bit kernel (seen on 4.12.0) */
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if (r == 0) {
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if (get) {
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*get = fsxattr.fsx_projid;
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} else {
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fsxattr.fsx_projid = set;
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r = ioctl(fd, EXT2_IOC_FSSETXATTR, &fsxattr);
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}
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}
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close_silently(fd);
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return r;
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#else /* ! HAVE_EXT2_IOCTLS */
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errno = EOPNOTSUPP;
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return -1;
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#endif /* ! HAVE_EXT2_IOCTLS */
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}
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/* Get/set a file flags on an ext2 file system */
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int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags)
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{
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#if HAVE_EXT2_IOCTLS
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struct stat buf;
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int fd, r;
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IF_LONG_IS_WIDER(unsigned f;)
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if (stat(name, &buf) == 0 /* stat is ok */
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&& !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode)
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) {
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goto notsupp;
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}
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fd = open(name, O_RDONLY | O_NONBLOCK); /* neither read nor write asked for */
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if (fd == -1)
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return -1;
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if (!get_flags) {
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IF_LONG_IS_WIDER(
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f = (unsigned) set_flags;
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r = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
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)
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IF_LONG_IS_SAME(
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r = ioctl(fd, EXT2_IOC_SETFLAGS, (void*)&set_flags);
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)
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} else {
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IF_LONG_IS_WIDER(
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r = ioctl(fd, EXT2_IOC_GETFLAGS, &f);
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*get_flags = f;
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)
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IF_LONG_IS_SAME(
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r = ioctl(fd, EXT2_IOC_GETFLAGS, (void*)get_flags);
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)
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}
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close_silently(fd);
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return r;
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notsupp:
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#endif /* HAVE_EXT2_IOCTLS */
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errno = EOPNOTSUPP;
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return -1;
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}
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/* Print file attributes on an ext2 file system */
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const uint32_t e2attr_flags_value[] ALIGN4 = {
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#ifdef ENABLE_COMPRESSION
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@ -215,7 +98,7 @@ static const char e2attr_flags_lname[] ALIGN1 =
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"Verity" "\0"
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/* Another trailing NUL is added by compiler */;
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void print_e2flags(FILE *f, unsigned long flags, unsigned options)
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void print_e2flags(FILE *f, unsigned flags, unsigned options)
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{
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const uint32_t *fv;
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const char *fn;
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@ -16,25 +16,10 @@ int iterate_on_dir(const char *dir_name,
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int FAST_FUNC (*func)(const char *, struct dirent *, void *),
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void *private);
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/* Get/set a file version on an ext2 file system */
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int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version);
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#define fgetversion(name, version) fgetsetversion(name, version, 0)
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#define fsetversion(name, version) fgetsetversion(name, NULL, version)
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/* Get/set a file project ID on an ext2 file system */
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int fgetsetprojid(const char *name, uint32_t *get, uint32_t set);
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#define fgetprojid(name, projid) fgetsetprojid(name, projid, 0)
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#define fsetprojid(name, projid) fgetsetprojid(name, NULL, projid)
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/* Get/set a file flags on an ext2 file system */
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int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags);
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#define fgetflags(name, flags) fgetsetflags(name, flags, 0)
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#define fsetflags(name, flags) fgetsetflags(name, NULL, flags)
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/* Must be 1 for compatibility with 'int long_format'. */
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#define PFOPT_LONG 1
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/* Print file attributes on an ext2 file system */
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void print_e2flags(FILE *f, unsigned long flags, unsigned options);
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void print_e2flags(FILE *f, unsigned flags, unsigned options);
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extern const uint32_t e2attr_flags_value[];
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extern const char e2attr_flags_sname[];
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@ -46,25 +46,35 @@ enum {
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static void list_attributes(const char *name)
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{
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unsigned long fsflags;
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unsigned fsflags;
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int fd, r;
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if (fgetflags(name, &fsflags) != 0)
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goto read_err;
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fd = open_or_warn(name, O_RDONLY | O_NONBLOCK); /* neither read nor write asked for */
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if (fd < 0) /* for example, dangling links */
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return;
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if (option_mask32 & OPT_PROJID) {
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uint32_t p;
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if (fgetprojid(name, &p) != 0)
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struct ext2_fsxattr fsxattr;
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r = ioctl(fd, EXT2_IOC_FSGETXATTR, &fsxattr);
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if (r != 0)
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goto read_err;
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printf("%5lu ", (unsigned long)p);
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printf("%5u ", (unsigned)fsxattr.fsx_projid);
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}
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if (option_mask32 & OPT_GENERATION) {
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unsigned long generation;
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if (fgetversion(name, &generation) != 0)
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unsigned generation;
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r = ioctl(fd, EXT2_IOC_GETVERSION, &generation);
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if (r != 0)
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goto read_err;
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printf("%-10lu ", generation);
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printf("%-10u ", generation);
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}
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r = ioctl(fd, EXT2_IOC_GETFLAGS, &fsflags);
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if (r != 0)
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goto read_err;
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close(fd);
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if (option_mask32 & OPT_PF_LONG) {
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printf("%-28s ", name);
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print_e2flags(stdout, fsflags, PFOPT_LONG);
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@ -77,6 +87,7 @@ static void list_attributes(const char *name)
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return;
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read_err:
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bb_perror_msg("reading %s", name);
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close(fd);
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}
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static int FAST_FUNC lsattr_dir_proc(const char *dir_name,
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@ -12751,7 +12751,7 @@ parsesub: {
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do {
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STPUTC(c, out);
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c = pgetc_eatbnl();
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} while (!subtype && isdigit(c));
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} while ((subtype == 0 || subtype == VSLENGTH) && isdigit(c));
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} else if (c != '}') {
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/* $[{[#]]<specialchar>[}] */
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int cc = c;
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@ -12781,11 +12781,6 @@ parsesub: {
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} else
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goto badsub;
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if (c != '}' && subtype == VSLENGTH) {
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/* ${#VAR didn't end with } */
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goto badsub;
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}
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if (subtype == 0) {
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static const char types[] ALIGN1 = "}-+?=";
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/* ${VAR...} but not $VAR or ${#VAR} */
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@ -12842,6 +12837,8 @@ parsesub: {
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#endif
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}
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} else {
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if (subtype == VSLENGTH && c != '}')
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subtype = 0;
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badsub:
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pungetc();
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}
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Block a user