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authorEric Paris <eparis@redhat.com>2009-05-13 12:50:40 -0400
committerJames Morris <jmorris@namei.org>2009-05-20 08:30:05 +1000
commitfbaa58696cef848de818768783ef185bd3f05158 (patch)
tree0055562c31266189533099d34f0909a0ec4c0bd4
parent279e677faa775ad16e75c32e1bf4a37f8158bc61 (diff)
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TPM: get_event_name stack corruption
get_event_name uses sprintf to fill a buffer declared on the stack. It fills the buffer 2 bytes at a time. What the code doesn't take into account is that sprintf(buf, "%02x", data) actually writes 3 bytes. 2 bytes for the data and then it nul terminates the string. Since we declare buf to be 40 characters long and then we write 40 bytes of data into buf sprintf is going to write 41 characters. The fix is to leave room in buf for the nul terminator. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
-rw-r--r--drivers/char/tpm/tpm_bios.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c
index ed306eb1057..0c2f55a38b9 100644
--- a/drivers/char/tpm/tpm_bios.c
+++ b/drivers/char/tpm/tpm_bios.c
@@ -212,7 +212,8 @@ static int get_event_name(char *dest, struct tcpa_event *event,
unsigned char * event_entry)
{
const char *name = "";
- char data[40] = "";
+ /* 41 so there is room for 40 data and 1 nul */
+ char data[41] = "";
int i, n_len = 0, d_len = 0;
struct tcpa_pc_event *pc_event;