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-rw-r--r--fs/isofs/rock.c962
1 files changed, 581 insertions, 381 deletions
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 089e79c65585..4326cb47f8fa 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -13,352 +13,542 @@
#include "isofs.h"
#include "rock.h"
-/* These functions are designed to read the system areas of a directory record
+/*
+ * These functions are designed to read the system areas of a directory record
* and extract relevant information. There are different functions provided
* depending upon what information we need at the time. One function fills
* out an inode structure, a second one extracts a filename, a third one
* returns a symbolic link name, and a fourth one returns the extent number
- * for the file. */
-
-#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
-
-
-/* This is a way of ensuring that we have something in the system
- use fields that is compatible with Rock Ridge */
-#define CHECK_SP(FAIL) \
- if(rr->u.SP.magic[0] != 0xbe) FAIL; \
- if(rr->u.SP.magic[1] != 0xef) FAIL; \
- ISOFS_SB(inode->i_sb)->s_rock_offset=rr->u.SP.skip;
-/* We define a series of macros because each function must do exactly the
- same thing in certain places. We use the macros to ensure that everything
- is done correctly */
-
-#define CONTINUE_DECLS \
- int cont_extent = 0, cont_offset = 0, cont_size = 0; \
- void *buffer = NULL
-
-#define CHECK_CE \
- {cont_extent = isonum_733(rr->u.CE.extent); \
- cont_offset = isonum_733(rr->u.CE.offset); \
- cont_size = isonum_733(rr->u.CE.size);}
-
-#define SETUP_ROCK_RIDGE(DE,CHR,LEN) \
- {LEN= sizeof(struct iso_directory_record) + DE->name_len[0]; \
- if(LEN & 1) LEN++; \
- CHR = ((unsigned char *) DE) + LEN; \
- LEN = *((unsigned char *) DE) - LEN; \
- if (LEN<0) LEN=0; \
- if (ISOFS_SB(inode->i_sb)->s_rock_offset!=-1) \
- { \
- LEN-=ISOFS_SB(inode->i_sb)->s_rock_offset; \
- CHR+=ISOFS_SB(inode->i_sb)->s_rock_offset; \
- if (LEN<0) LEN=0; \
- } \
-}
-
-#define MAYBE_CONTINUE(LABEL,DEV) \
- {if (buffer) { kfree(buffer); buffer = NULL; } \
- if (cont_extent){ \
- int block, offset, offset1; \
- struct buffer_head * pbh; \
- buffer = kmalloc(cont_size,GFP_KERNEL); \
- if (!buffer) goto out; \
- block = cont_extent; \
- offset = cont_offset; \
- offset1 = 0; \
- pbh = sb_bread(DEV->i_sb, block); \
- if(pbh){ \
- if (offset > pbh->b_size || offset + cont_size > pbh->b_size){ \
- brelse(pbh); \
- goto out; \
- } \
- memcpy(buffer + offset1, pbh->b_data + offset, cont_size - offset1); \
- brelse(pbh); \
- chr = (unsigned char *) buffer; \
- len = cont_size; \
- cont_extent = 0; \
- cont_size = 0; \
- cont_offset = 0; \
- goto LABEL; \
- } \
- printk("Unable to read rock-ridge attributes\n"); \
- }}
-
-/* return length of name field; 0: not found, -1: to be ignored */
-int get_rock_ridge_filename(struct iso_directory_record * de,
- char * retname, struct inode * inode)
+ * for the file.
+ */
+
+#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
+
+struct rock_state {
+ void *buffer;
+ unsigned char *chr;
+ int len;
+ int cont_size;
+ int cont_extent;
+ int cont_offset;
+ struct inode *inode;
+};
+
+/*
+ * This is a way of ensuring that we have something in the system
+ * use fields that is compatible with Rock Ridge. Return zero on success.
+ */
+
+static int check_sp(struct rock_ridge *rr, struct inode *inode)
{
- int len;
- unsigned char * chr;
- CONTINUE_DECLS;
- int retnamlen = 0, truncate=0;
-
- if (!ISOFS_SB(inode->i_sb)->s_rock) return 0;
- *retname = 0;
-
- SETUP_ROCK_RIDGE(de, chr, len);
- repeat:
- {
- struct rock_ridge * rr;
- int sig;
-
- while (len > 2){ /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *) chr;
- if (rr->len < 3) goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0) goto out; /* corrupted isofs */
-
- switch(sig){
- case SIG('R','R'):
- if((rr->u.RR.flags[0] & RR_NM) == 0) goto out;
- break;
- case SIG('S','P'):
- CHECK_SP(goto out);
- break;
- case SIG('C','E'):
- CHECK_CE;
- break;
- case SIG('N','M'):
- if (truncate) break;
- if (rr->len < 5) break;
- /*
- * If the flags are 2 or 4, this indicates '.' or '..'.
- * We don't want to do anything with this, because it
- * screws up the code that calls us. We don't really
- * care anyways, since we can just use the non-RR
- * name.
- */
- if (rr->u.NM.flags & 6) {
- break;
+ if (rr->u.SP.magic[0] != 0xbe)
+ return -1;
+ if (rr->u.SP.magic[1] != 0xef)
+ return -1;
+ ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip;
+ return 0;
+}
+
+static void setup_rock_ridge(struct iso_directory_record *de,
+ struct inode *inode, struct rock_state *rs)
+{
+ rs->len = sizeof(struct iso_directory_record) + de->name_len[0];
+ if (rs->len & 1)
+ (rs->len)++;
+ rs->chr = (unsigned char *)de + rs->len;
+ rs->len = *((unsigned char *)de) - rs->len;
+ if (rs->len < 0)
+ rs->len = 0;
+
+ if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) {
+ rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
+ rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
+ if (rs->len < 0)
+ rs->len = 0;
+ }
+}
+
+static void init_rock_state(struct rock_state *rs, struct inode *inode)
+{
+ memset(rs, 0, sizeof(*rs));
+ rs->inode = inode;
+}
+
+/*
+ * Returns 0 if the caller should continue scanning, 1 if the scan must end
+ * and -ve on error.
+ */
+static int rock_continue(struct rock_state *rs)
+{
+ int ret = 1;
+ int blocksize = 1 << rs->inode->i_blkbits;
+ const int min_de_size = offsetof(struct rock_ridge, u);
+
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+
+ if ((unsigned)rs->cont_offset > blocksize - min_de_size ||
+ (unsigned)rs->cont_size > blocksize ||
+ (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) {
+ printk(KERN_NOTICE "rock: corrupted directory entry. "
+ "extent=%d, offset=%d, size=%d\n",
+ rs->cont_extent, rs->cont_offset, rs->cont_size);
+ ret = -EIO;
+ goto out;
}
- if (rr->u.NM.flags & ~1) {
- printk("Unsupported NM flag settings (%d)\n",rr->u.NM.flags);
- break;
+ if (rs->cont_extent) {
+ struct buffer_head *bh;
+
+ rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL);
+ if (!rs->buffer) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = -EIO;
+ bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
+ if (bh) {
+ memcpy(rs->buffer, bh->b_data + rs->cont_offset,
+ rs->cont_size);
+ put_bh(bh);
+ rs->chr = rs->buffer;
+ rs->len = rs->cont_size;
+ rs->cont_extent = 0;
+ rs->cont_size = 0;
+ rs->cont_offset = 0;
+ return 0;
+ }
+ printk("Unable to read rock-ridge attributes\n");
+ }
+out:
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+ return ret;
+}
+
+/*
+ * We think there's a record of type `sig' at rs->chr. Parse the signature
+ * and make sure that there's really room for a record of that type.
+ */
+static int rock_check_overflow(struct rock_state *rs, int sig)
+{
+ int len;
+
+ switch (sig) {
+ case SIG('S', 'P'):
+ len = sizeof(struct SU_SP_s);
+ break;
+ case SIG('C', 'E'):
+ len = sizeof(struct SU_CE_s);
+ break;
+ case SIG('E', 'R'):
+ len = sizeof(struct SU_ER_s);
+ break;
+ case SIG('R', 'R'):
+ len = sizeof(struct RR_RR_s);
+ break;
+ case SIG('P', 'X'):
+ len = sizeof(struct RR_PX_s);
+ break;
+ case SIG('P', 'N'):
+ len = sizeof(struct RR_PN_s);
+ break;
+ case SIG('S', 'L'):
+ len = sizeof(struct RR_SL_s);
+ break;
+ case SIG('N', 'M'):
+ len = sizeof(struct RR_NM_s);
+ break;
+ case SIG('C', 'L'):
+ len = sizeof(struct RR_CL_s);
+ break;
+ case SIG('P', 'L'):
+ len = sizeof(struct RR_PL_s);
+ break;
+ case SIG('T', 'F'):
+ len = sizeof(struct RR_TF_s);
+ break;
+ case SIG('Z', 'F'):
+ len = sizeof(struct RR_ZF_s);
+ break;
+ default:
+ len = 0;
+ break;
}
- if((strlen(retname) + rr->len - 5) >= 254) {
- truncate = 1;
- break;
+ len += offsetof(struct rock_ridge, u);
+ if (len > rs->len) {
+ printk(KERN_NOTICE "rock: directory entry would overflow "
+ "storage\n");
+ printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n",
+ sig, len, rs->len);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * return length of name field; 0: not found, -1: to be ignored
+ */
+int get_rock_ridge_filename(struct iso_directory_record *de,
+ char *retname, struct inode *inode)
+{
+ struct rock_state rs;
+ struct rock_ridge *rr;
+ int sig;
+ int retnamlen = 0;
+ int truncate = 0;
+ int ret = 0;
+
+ if (!ISOFS_SB(inode->i_sb)->s_rock)
+ return 0;
+ *retname = 0;
+
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
+repeat:
+
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
+ if (rr->len < 3)
+ goto out; /* Something got screwed up here */
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto eio;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
+ goto eio; /* corrupted isofs */
+
+ switch (sig) {
+ case SIG('R', 'R'):
+ if ((rr->u.RR.flags[0] & RR_NM) == 0)
+ goto out;
+ break;
+ case SIG('S', 'P'):
+ if (check_sp(rr, inode))
+ goto out;
+ break;
+ case SIG('C', 'E'):
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
+ break;
+ case SIG('N', 'M'):
+ if (truncate)
+ break;
+ if (rr->len < 5)
+ break;
+ /*
+ * If the flags are 2 or 4, this indicates '.' or '..'.
+ * We don't want to do anything with this, because it
+ * screws up the code that calls us. We don't really
+ * care anyways, since we can just use the non-RR
+ * name.
+ */
+ if (rr->u.NM.flags & 6)
+ break;
+
+ if (rr->u.NM.flags & ~1) {
+ printk("Unsupported NM flag settings (%d)\n",
+ rr->u.NM.flags);
+ break;
+ }
+ if ((strlen(retname) + rr->len - 5) >= 254) {
+ truncate = 1;
+ break;
+ }
+ strncat(retname, rr->u.NM.name, rr->len - 5);
+ retnamlen += rr->len - 5;
+ break;
+ case SIG('R', 'E'):
+ kfree(rs.buffer);
+ return -1;
+ default:
+ break;
+ }
}
- strncat(retname, rr->u.NM.name, rr->len - 5);
- retnamlen += rr->len - 5;
- break;
- case SIG('R','E'):
- if (buffer) kfree(buffer);
- return -1;
- default:
- break;
- }
- }
- }
- MAYBE_CONTINUE(repeat,inode);
- if (buffer) kfree(buffer);
- return retnamlen; /* If 0, this file did not have a NM field */
- out:
- if(buffer) kfree(buffer);
- return 0;
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ return retnamlen; /* If 0, this file did not have a NM field */
+out:
+ kfree(rs.buffer);
+ return ret;
+eio:
+ ret = -EIO;
+ goto out;
}
static int
parse_rock_ridge_inode_internal(struct iso_directory_record *de,
struct inode *inode, int regard_xa)
{
- int len;
- unsigned char * chr;
- int symlink_len = 0;
- CONTINUE_DECLS;
-
- if (!ISOFS_SB(inode->i_sb)->s_rock) return 0;
-
- SETUP_ROCK_RIDGE(de, chr, len);
- if (regard_xa)
- {
- chr+=14;
- len-=14;
- if (len<0) len=0;
- }
-
- repeat:
- {
- int cnt, sig;
- struct inode * reloc;
- struct rock_ridge * rr;
- int rootflag;
-
- while (len > 2){ /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *) chr;
- if (rr->len < 3) goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0) goto out; /* corrupted isofs */
-
- switch(sig){
+ int symlink_len = 0;
+ int cnt, sig;
+ struct inode *reloc;
+ struct rock_ridge *rr;
+ int rootflag;
+ struct rock_state rs;
+ int ret = 0;
+
+ if (!ISOFS_SB(inode->i_sb)->s_rock)
+ return 0;
+
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
+ if (regard_xa) {
+ rs.chr += 14;
+ rs.len -= 14;
+ if (rs.len < 0)
+ rs.len = 0;
+ }
+
+repeat:
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
+ if (rr->len < 3)
+ goto out; /* Something got screwed up here */
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto eio;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
+ goto eio; /* corrupted isofs */
+
+ switch (sig) {
#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */
- case SIG('R','R'):
- if((rr->u.RR.flags[0] &
- (RR_PX | RR_TF | RR_SL | RR_CL)) == 0) goto out;
- break;
+ case SIG('R', 'R'):
+ if ((rr->u.RR.flags[0] &
+ (RR_PX | RR_TF | RR_SL | RR_CL)) == 0)
+ goto out;
+ break;
#endif
- case SIG('S','P'):
- CHECK_SP(goto out);
- break;
- case SIG('C','E'):
- CHECK_CE;
- break;
- case SIG('E','R'):
- ISOFS_SB(inode->i_sb)->s_rock = 1;
- printk(KERN_DEBUG "ISO 9660 Extensions: ");
- { int p;
- for(p=0;p<rr->u.ER.len_id;p++) printk("%c",rr->u.ER.data[p]);
- }
- printk("\n");
- break;
- case SIG('P','X'):
- inode->i_mode = isonum_733(rr->u.PX.mode);
- inode->i_nlink = isonum_733(rr->u.PX.n_links);
- inode->i_uid = isonum_733(rr->u.PX.uid);
- inode->i_gid = isonum_733(rr->u.PX.gid);
- break;
- case SIG('P','N'):
- { int high, low;
- high = isonum_733(rr->u.PN.dev_high);
- low = isonum_733(rr->u.PN.dev_low);
- /*
- * The Rock Ridge standard specifies that if sizeof(dev_t) <= 4,
- * then the high field is unused, and the device number is completely
- * stored in the low field. Some writers may ignore this subtlety,
- * and as a result we test to see if the entire device number is
- * stored in the low field, and use that.
- */
- if((low & ~0xff) && high == 0) {
- inode->i_rdev = MKDEV(low >> 8, low & 0xff);
- } else {
- inode->i_rdev = MKDEV(high, low);
- }
- }
- break;
- case SIG('T','F'):
- /* Some RRIP writers incorrectly place ctime in the TF_CREATE field.
- Try to handle this correctly for either case. */
- cnt = 0; /* Rock ridge never appears on a High Sierra disk */
- if(rr->u.TF.flags & TF_CREATE) {
- inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
- inode->i_ctime.tv_nsec = 0;
- }
- if(rr->u.TF.flags & TF_MODIFY) {
- inode->i_mtime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
- inode->i_mtime.tv_nsec = 0;
- }
- if(rr->u.TF.flags & TF_ACCESS) {
- inode->i_atime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
- inode->i_atime.tv_nsec = 0;
- }
- if(rr->u.TF.flags & TF_ATTRIBUTES) {
- inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
- inode->i_ctime.tv_nsec = 0;
- }
- break;
- case SIG('S','L'):
- {int slen;
- struct SL_component * slp;
- struct SL_component * oldslp;
- slen = rr->len - 5;
- slp = &rr->u.SL.link;
- inode->i_size = symlink_len;
- while (slen > 1){
- rootflag = 0;
- switch(slp->flags &~1){
- case 0:
- inode->i_size += slp->len;
- break;
- case 2:
- inode->i_size += 1;
- break;
- case 4:
- inode->i_size += 2;
- break;
- case 8:
- rootflag = 1;
- inode->i_size += 1;
- break;
- default:
- printk("Symlink component flag not implemented\n");
- }
- slen -= slp->len + 2;
- oldslp = slp;
- slp = (struct SL_component *) (((char *) slp) + slp->len + 2);
-
- if(slen < 2) {
- if( ((rr->u.SL.flags & 1) != 0)
- && ((oldslp->flags & 1) == 0) ) inode->i_size += 1;
- break;
- }
-
- /*
- * If this component record isn't continued, then append a '/'.
- */
- if (!rootflag && (oldslp->flags & 1) == 0)
- inode->i_size += 1;
- }
- }
- symlink_len = inode->i_size;
- break;
- case SIG('R','E'):
- printk(KERN_WARNING "Attempt to read inode for relocated directory\n");
- goto out;
- case SIG('C','L'):
- ISOFS_I(inode)->i_first_extent = isonum_733(rr->u.CL.location);
- reloc = isofs_iget(inode->i_sb, ISOFS_I(inode)->i_first_extent, 0);
- if (!reloc)
- goto out;
- inode->i_mode = reloc->i_mode;
- inode->i_nlink = reloc->i_nlink;
- inode->i_uid = reloc->i_uid;
- inode->i_gid = reloc->i_gid;
- inode->i_rdev = reloc->i_rdev;
- inode->i_size = reloc->i_size;
- inode->i_blocks = reloc->i_blocks;
- inode->i_atime = reloc->i_atime;
- inode->i_ctime = reloc->i_ctime;
- inode->i_mtime = reloc->i_mtime;
- iput(reloc);
- break;
+ case SIG('S', 'P'):
+ if (check_sp(rr, inode))
+ goto out;
+ break;
+ case SIG('C', 'E'):
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
+ break;
+ case SIG('E', 'R'):
+ ISOFS_SB(inode->i_sb)->s_rock = 1;
+ printk(KERN_DEBUG "ISO 9660 Extensions: ");
+ {
+ int p;
+ for (p = 0; p < rr->u.ER.len_id; p++)
+ printk("%c", rr->u.ER.data[p]);
+ }
+ printk("\n");
+ break;
+ case SIG('P', 'X'):
+ inode->i_mode = isonum_733(rr->u.PX.mode);
+ inode->i_nlink = isonum_733(rr->u.PX.n_links);
+ inode->i_uid = isonum_733(rr->u.PX.uid);
+ inode->i_gid = isonum_733(rr->u.PX.gid);
+ break;
+ case SIG('P', 'N'):
+ {
+ int high, low;
+ high = isonum_733(rr->u.PN.dev_high);
+ low = isonum_733(rr->u.PN.dev_low);
+ /*
+ * The Rock Ridge standard specifies that if
+ * sizeof(dev_t) <= 4, then the high field is
+ * unused, and the device number is completely
+ * stored in the low field. Some writers may
+ * ignore this subtlety,
+ * and as a result we test to see if the entire
+ * device number is
+ * stored in the low field, and use that.
+ */
+ if ((low & ~0xff) && high == 0) {
+ inode->i_rdev =
+ MKDEV(low >> 8, low & 0xff);
+ } else {
+ inode->i_rdev =
+ MKDEV(high, low);
+ }
+ }
+ break;
+ case SIG('T', 'F'):
+ /*
+ * Some RRIP writers incorrectly place ctime in the
+ * TF_CREATE field. Try to handle this correctly for
+ * either case.
+ */
+ /* Rock ridge never appears on a High Sierra disk */
+ cnt = 0;
+ if (rr->u.TF.flags & TF_CREATE) {
+ inode->i_ctime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_ctime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_MODIFY) {
+ inode->i_mtime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_mtime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_ACCESS) {
+ inode->i_atime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_atime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_ATTRIBUTES) {
+ inode->i_ctime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_ctime.tv_nsec = 0;
+ }
+ break;
+ case SIG('S', 'L'):
+ {
+ int slen;
+ struct SL_component *slp;
+ struct SL_component *oldslp;
+ slen = rr->len - 5;
+ slp = &rr->u.SL.link;
+ inode->i_size = symlink_len;
+ while (slen > 1) {
+ rootflag = 0;
+ switch (slp->flags & ~1) {
+ case 0:
+ inode->i_size +=
+ slp->len;
+ break;
+ case 2:
+ inode->i_size += 1;
+ break;
+ case 4:
+ inode->i_size += 2;
+ break;
+ case 8:
+ rootflag = 1;
+ inode->i_size += 1;
+ break;
+ default:
+ printk("Symlink component flag "
+ "not implemented\n");
+ }
+ slen -= slp->len + 2;
+ oldslp = slp;
+ slp = (struct SL_component *)
+ (((char *)slp) + slp->len + 2);
+
+ if (slen < 2) {
+ if (((rr->u.SL.
+ flags & 1) != 0)
+ &&
+ ((oldslp->
+ flags & 1) == 0))
+ inode->i_size +=
+ 1;
+ break;
+ }
+
+ /*
+ * If this component record isn't
+ * continued, then append a '/'.
+ */
+ if (!rootflag
+ && (oldslp->flags & 1) == 0)
+ inode->i_size += 1;
+ }
+ }
+ symlink_len = inode->i_size;
+ break;
+ case SIG('R', 'E'):
+ printk(KERN_WARNING "Attempt to read inode for "
+ "relocated directory\n");
+ goto out;
+ case SIG('C', 'L'):
+ ISOFS_I(inode)->i_first_extent =
+ isonum_733(rr->u.CL.location);
+ reloc =
+ isofs_iget(inode->i_sb,
+ ISOFS_I(inode)->i_first_extent,
+ 0);
+ if (!reloc)
+ goto out;
+ inode->i_mode = reloc->i_mode;
+ inode->i_nlink = reloc->i_nlink;
+ inode->i_uid = reloc->i_uid;
+ inode->i_gid = reloc->i_gid;
+ inode->i_rdev = reloc->i_rdev;
+ inode->i_size = reloc->i_size;
+ inode->i_blocks = reloc->i_blocks;
+ inode->i_atime = reloc->i_atime;
+ inode->i_ctime = reloc->i_ctime;
+ inode->i_mtime = reloc->i_mtime;
+ iput(reloc);
+ break;
#ifdef CONFIG_ZISOFS
- case SIG('Z','F'):
- if ( !ISOFS_SB(inode->i_sb)->s_nocompress ) {
- int algo;
- algo = isonum_721(rr->u.ZF.algorithm);
- if ( algo == SIG('p','z') ) {
- int block_shift = isonum_711(&rr->u.ZF.parms[1]);
- if ( block_shift < PAGE_CACHE_SHIFT || block_shift > 17 ) {
- printk(KERN_WARNING "isofs: Can't handle ZF block size of 2^%d\n", block_shift);
- } else {
- /* Note: we don't change i_blocks here */
- ISOFS_I(inode)->i_file_format = isofs_file_compressed;
- /* Parameters to compression algorithm (header size, block size) */
- ISOFS_I(inode)->i_format_parm[0] = isonum_711(&rr->u.ZF.parms[0]);
- ISOFS_I(inode)->i_format_parm[1] = isonum_711(&rr->u.ZF.parms[1]);
- inode->i_size = isonum_733(rr->u.ZF.real_size);
- }
- } else {
- printk(KERN_WARNING "isofs: Unknown ZF compression algorithm: %c%c\n",
- rr->u.ZF.algorithm[0], rr->u.ZF.algorithm[1]);
- }
- }
- break;
+ case SIG('Z', 'F'): {
+ int algo;
+
+ if (ISOFS_SB(inode->i_sb)->s_nocompress)
+ break;
+ algo = isonum_721(rr->u.ZF.algorithm);
+ if (algo == SIG('p', 'z')) {
+ int block_shift =
+ isonum_711(&rr->u.ZF.parms[1]);
+ if (block_shift < PAGE_CACHE_SHIFT
+ || block_shift > 17) {
+ printk(KERN_WARNING "isofs: "
+ "Can't handle ZF block "
+ "size of 2^%d\n",
+ block_shift);
+ } else {
+ /*
+ * Note: we don't change
+ * i_blocks here
+ */
+ ISOFS_I(inode)->i_file_format =
+ isofs_file_compressed;
+ /*
+ * Parameters to compression
+ * algorithm (header size,
+ * block size)
+ */
+ ISOFS_I(inode)->i_format_parm[0] =
+ isonum_711(&rr->u.ZF.parms[0]);
+ ISOFS_I(inode)->i_format_parm[1] =
+ isonum_711(&rr->u.ZF.parms[1]);
+ inode->i_size =
+ isonum_733(rr->u.ZF.
+ real_size);
+ }
+ } else {
+ printk(KERN_WARNING
+ "isofs: Unknown ZF compression "
+ "algorithm: %c%c\n",
+ rr->u.ZF.algorithm[0],
+ rr->u.ZF.algorithm[1]);
+ }
+ break;
+ }
#endif
- default:
- break;
- }
- }
- }
- MAYBE_CONTINUE(repeat,inode);
- out:
- if(buffer) kfree(buffer);
- return 0;
+ default:
+ break;
+ }
+ }
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ ret = 0;
+out:
+ kfree(rs.buffer);
+ return ret;
+eio:
+ ret = -EIO;
+ goto out;
}
static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
@@ -376,32 +566,32 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
if (slp->len > plimit - rpnt)
return NULL;
memcpy(rpnt, slp->text, slp->len);
- rpnt+=slp->len;
+ rpnt += slp->len;
break;
case 2:
if (rpnt >= plimit)
return NULL;
- *rpnt++='.';
+ *rpnt++ = '.';
break;
case 4:
if (2 > plimit - rpnt)
return NULL;
- *rpnt++='.';
- *rpnt++='.';
+ *rpnt++ = '.';
+ *rpnt++ = '.';
break;
case 8:
if (rpnt >= plimit)
return NULL;
rootflag = 1;
- *rpnt++='/';
+ *rpnt++ = '/';
break;
default:
printk("Symlink component flag not implemented (%d)\n",
- slp->flags);
+ slp->flags);
}
slen -= slp->len + 2;
oldslp = slp;
- slp = (struct SL_component *) ((char *) slp + slp->len + 2);
+ slp = (struct SL_component *)((char *)slp + slp->len + 2);
if (slen < 2) {
/*
@@ -412,7 +602,7 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
!(oldslp->flags & 1)) {
if (rpnt >= plimit)
return NULL;
- *rpnt++='/';
+ *rpnt++ = '/';
}
break;
}
@@ -423,59 +613,61 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
if (!rootflag && !(oldslp->flags & 1)) {
if (rpnt >= plimit)
return NULL;
- *rpnt++='/';
+ *rpnt++ = '/';
}
}
return rpnt;
}
-int parse_rock_ridge_inode(struct iso_directory_record * de,
- struct inode * inode)
+int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode)
{
- int result=parse_rock_ridge_inode_internal(de,inode,0);
- /* if rockridge flag was reset and we didn't look for attributes
- * behind eventual XA attributes, have a look there */
- if ((ISOFS_SB(inode->i_sb)->s_rock_offset==-1)
- &&(ISOFS_SB(inode->i_sb)->s_rock==2))
- {
- result=parse_rock_ridge_inode_internal(de,inode,14);
- }
- return result;
-}
+ int result = parse_rock_ridge_inode_internal(de, inode, 0);
-/* readpage() for symlinks: reads symlink contents into the page and either
- makes it uptodate and returns 0 or returns error (-EIO) */
+ /*
+ * if rockridge flag was reset and we didn't look for attributes
+ * behind eventual XA attributes, have a look there
+ */
+ if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1)
+ && (ISOFS_SB(inode->i_sb)->s_rock == 2)) {
+ result = parse_rock_ridge_inode_internal(de, inode, 14);
+ }
+ return result;
+}
+/*
+ * readpage() for symlinks: reads symlink contents into the page and either
+ * makes it uptodate and returns 0 or returns error (-EIO)
+ */
static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
- struct iso_inode_info *ei = ISOFS_I(inode);
+ struct iso_inode_info *ei = ISOFS_I(inode);
char *link = kmap(page);
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
struct buffer_head *bh;
char *rpnt = link;
unsigned char *pnt;
- struct iso_directory_record *raw_inode;
- CONTINUE_DECLS;
+ struct iso_directory_record *raw_de;
unsigned long block, offset;
int sig;
- int len;
- unsigned char *chr;
struct rock_ridge *rr;
+ struct rock_state rs;
+ int ret;
if (!ISOFS_SB(inode->i_sb)->s_rock)
goto error;
+ init_rock_state(&rs, inode);
block = ei->i_iget5_block;
lock_kernel();
bh = sb_bread(inode->i_sb, block);
if (!bh)
goto out_noread;
- offset = ei->i_iget5_offset;
- pnt = (unsigned char *) bh->b_data + offset;
+ offset = ei->i_iget5_offset;
+ pnt = (unsigned char *)bh->b_data + offset;
- raw_inode = (struct iso_directory_record *) pnt;
+ raw_de = (struct iso_directory_record *)pnt;
/*
* If we go past the end of the buffer, there is some sort of error.
@@ -483,20 +675,24 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
if (offset + *pnt > bufsize)
goto out_bad_span;
- /* Now test for possible Rock Ridge extensions which will override
- some of these numbers in the inode structure. */
+ /*
+ * Now test for possible Rock Ridge extensions which will override
+ * some of these numbers in the inode structure.
+ */
- SETUP_ROCK_RIDGE(raw_inode, chr, len);
+ setup_rock_ridge(raw_de, inode, &rs);
- repeat:
- while (len > 2) { /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *) chr;
+repeat:
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
if (rr->len < 3)
goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0)
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto out;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
goto out; /* corrupted isofs */
switch (sig) {
@@ -505,7 +701,8 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
goto out;
break;
case SIG('S', 'P'):
- CHECK_SP(goto out);
+ if (check_sp(rr, inode))
+ goto out;
break;
case SIG('S', 'L'):
rpnt = get_symlink_chunk(rpnt, rr,
@@ -515,14 +712,18 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
break;
case SIG('C', 'E'):
/* This tells is if there is a continuation record */
- CHECK_CE;
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
default:
break;
}
}
- MAYBE_CONTINUE(repeat, inode);
- if (buffer)
- kfree(buffer);
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret < 0)
+ goto fail;
if (rpnt == link)
goto fail;
@@ -535,19 +736,18 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
return 0;
/* error exit from macro */
- out:
- if (buffer)
- kfree(buffer);
+out:
+ kfree(rs.buffer);
goto fail;
- out_noread:
+out_noread:
printk("unable to read i-node block");
goto fail;
- out_bad_span:
+out_bad_span:
printk("symlink spans iso9660 blocks\n");
- fail:
+fail:
brelse(bh);
unlock_kernel();
- error:
+error:
SetPageError(page);
kunmap(page);
unlock_page(page);
@@ -555,5 +755,5 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
}
struct address_space_operations isofs_symlink_aops = {
- .readpage = rock_ridge_symlink_readpage
+ .readpage = rock_ridge_symlink_readpage
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 12:01:00 +0000