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authorNeil Horman <nhorman@redhat.com>2005-06-23 00:09:11 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:19 -0700
commitac20427ef6aa63da663bdc88b71d16f7394f5e23 (patch)
tree49ba4f88c5cea42d59b386c508174f585efc8a01 /fs
parent3bc1ee3e8f1c05c0f64a479c6d56eb34a6190599 (diff)
[PATCH] add check to /proc/devices read routines
Patch to add check to get_chrdev_list and get_blkdev_list to prevent reads of /proc/devices from spilling over the provided page if more than 4096 bytes of string data are generated from all the registered character and block devices in a system Signed-off-by: Neil Horman <nhorman@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/char_dev.c13
-rw-r--r--fs/proc/proc_misc.c2
2 files changed, 13 insertions, 2 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index c1e3537909f..e82aac9cc2f 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -56,10 +56,21 @@ int get_chrdev_list(char *page)
down(&chrdevs_lock);
for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
- for (cd = chrdevs[i]; cd; cd = cd->next)
+ for (cd = chrdevs[i]; cd; cd = cd->next) {
+ /*
+ * if the current name, plus the 5 extra characters
+ * in the device line for this entry
+ * would run us off the page, we're done
+ */
+ if ((len+strlen(cd->name) + 5) >= PAGE_SIZE)
+ goto page_full;
+
+
len += sprintf(page+len, "%3d %s\n",
cd->major, cd->name);
+ }
}
+page_full:
up(&chrdevs_lock);
return len;
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 63a9fbf1ac5..94b570ad037 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -451,7 +451,7 @@ static int devices_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len = get_chrdev_list(page);
- len += get_blkdev_list(page+len);
+ len += get_blkdev_list(page+len, len);
return proc_calc_metrics(page, start, off, count, eof, len);
}