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| author | Mathias Krause <minipli@grsecurity.net> | 2022-01-27 18:34:19 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-29 10:26:11 +0100 |
| commit | ae2b20f27732fe92055d9e7b350abc5cdf3e2414 (patch) | |
| tree | 65e25c6e38e00f425dc7e4f9014c7a0ca81b00d1 /Makefile | |
| parent | 11ba2c6dfb902de05b73000a98534e376173b6ca (diff) | |
drm/vmwgfx: Fix stale file descriptors on failed usercopy
commit a0f90c8815706981c483a652a6aefca51a5e191c upstream.
A failing usercopy of the fence_rep object will lead to a stale entry in
the file descriptor table as put_unused_fd() won't release it. This
enables userland to refer to a dangling 'file' object through that still
valid file descriptor, leading to all kinds of use-after-free
exploitation scenarios.
Fix this by deferring the call to fd_install() until after the usercopy
has succeeded.
Fixes: c906965dee22 ("drm/vmwgfx: Add export fence to file descriptor support")
Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions