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authorAndrew Morton <akpm@osdl.org>2005-06-21 17:16:51 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:38 -0700
commitf2966632a134e865db3c819346a1dc7d96e05309 (patch)
tree7285849b32f99b40de71e647366f1703a612e2c2 /fs/isofs
parent642217c17b9a56c7e4cf48f6a13dfd5e4a4c2e10 (diff)
[PATCH] rock: handle directory overflows
Handle the case where the variable-sized part of a rock-ridge directory entry overhangs the end of the buffer which we allocated for it. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/isofs')
-rw-r--r--fs/isofs/rock.c76
1 files changed, 74 insertions, 2 deletions
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 9a81830abff8..4326cb47f8fa 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -127,6 +127,66 @@ out:
}
/*
+ * 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;
+ }
+ 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,
@@ -152,10 +212,12 @@ repeat:
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 out; /* corrupted isofs */
+ goto eio; /* corrupted isofs */
switch (sig) {
case SIG('R', 'R'):
@@ -213,6 +275,9 @@ repeat:
out:
kfree(rs.buffer);
return ret;
+eio:
+ ret = -EIO;
+ goto out;
}
static int
@@ -245,10 +310,12 @@ repeat:
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 out; /* corrupted isofs */
+ goto eio; /* corrupted isofs */
switch (sig) {
#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */
@@ -479,6 +546,9 @@ repeat:
out:
kfree(rs.buffer);
return ret;
+eio:
+ ret = -EIO;
+ goto out;
}
static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
@@ -618,6 +688,8 @@ repeat:
if (rr->len < 3)
goto out; /* Something got screwed up here */
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)