diff options
author | David S. Miller <davem@sunset.davemloft.net> | 2007-11-20 03:29:53 -0800 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2007-11-20 03:29:53 -0800 |
commit | 0a06ea87185531705e4417e3a051f81b64f210c1 (patch) | |
tree | 703406ed0893a28e6940f273c81af0bdc9081c06 /include | |
parent | a572da43738f156a6c81034467da429903483687 (diff) |
[WIRELESS] WEXT: Fix userspace corruption on 64-bit.
On 64-bit systems sizeof(struct ifreq) is 8 bytes larger than
sizeof(struct iwreq).
For GET calls, the wireless extension code copies back into userspace
using sizeof(struct ifreq) but userspace and elsewhere only allocates
a "struct iwreq". Thus, this copy writes past the end of the iwreq
object and corrupts whatever sits after it in memory.
Fix the copy_to_user() length.
This particularly hurts the compat case because the wireless compat
code uses compat_alloc_userspace() and right after this allocated
buffer is the current bottom of the user stack, and that's what gets
overwritten by the copy_to_user() call.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions