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| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2010-09-15 19:08:24 -0400 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2010-09-15 23:43:53 +0000 |
| commit | b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca (patch) | |
| tree | db374bec1bf1ee1530b31d40ee4d6ff59819ca89 /drivers/video | |
| parent | f27098379b1dbfedae99e5b86e10529f799d4071 (diff) | |
| download | lwn-b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca.tar.gz lwn-b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca.zip | |
drivers/video/via/ioctl.c: prevent reading uninitialized stack memory
The VIAFB_GET_INFO device ioctl allows unprivileged users to read 246
bytes of uninitialized stack memory, because the "reserved" member of
the viafb_ioctl_info struct declared on the stack is not altered or
zeroed before being copied back to the user. This patch takes care of
it.
Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/via/ioctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/video/via/ioctl.c b/drivers/video/via/ioctl.c index da03c074e32a..4d553d0b8d7a 100644 --- a/drivers/video/via/ioctl.c +++ b/drivers/video/via/ioctl.c @@ -25,6 +25,8 @@ int viafb_ioctl_get_viafb_info(u_long arg) { struct viafb_ioctl_info viainfo; + memset(&viainfo, 0, sizeof(struct viafb_ioctl_info)); + viainfo.viafb_id = VIAID; viainfo.vendor_id = PCI_VIA_VENDOR_ID; |