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authorMarcel Holtmann <marcel@holtmann.org>2007-03-06 22:12:00 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-06 18:01:04 -0800
commit059819a41d4331316dd8ddcf977a24ab338f4300 (patch)
treef4d93f613001c195d66dffaa5b3593dcaf4e8d53
parent266d4f40370757459f8aa063976c932d0de5e59b (diff)
[PATCH] Fix buffer overflow in Omnikey CardMan 4040 driver (CVE-2007-0005)
Based on a patch from Don Howard <dhoward@redhat.com> When calling write() with a buffer larger than 512 bytes, the driver's write buffer overflows, allowing to overwrite the EIP and execute arbitrary code with kernel privileges. In read(), there exists a similar problem, but coming from the device. A malicous or buggy device sending more than 512 bytes can overflow of the driver's read buffer, with the same effects as above. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Harald Welte <laforge@gnumonks.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/pcmcia/cm4040_cs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index 0e82968c2f3..f2e4ec4fd40 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -273,6 +273,7 @@ static ssize_t cm4040_read(struct file *filp, char __user *buf,
DEBUGP(6, dev, "BytesToRead=%lu\n", bytes_to_read);
min_bytes_to_read = min(count, bytes_to_read + 5);
+ min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
DEBUGP(6, dev, "Min=%lu\n", min_bytes_to_read);
@@ -340,7 +341,7 @@ static ssize_t cm4040_write(struct file *filp, const char __user *buf,
return 0;
}
- if (count < 5) {
+ if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
return -EIO;
}