diff options
| author | Hyunwoo Kim <imv4bel@gmail.com> | 2022-09-07 09:07:14 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-15 12:17:02 +0200 |
| commit | 021805af5bedeafc76c117fc771c100b358ab419 (patch) | |
| tree | fadd5811529082d3a0475a61a758ddf922002c62 /Documentation | |
| parent | ca0d26cc15fd2931b407f6fee249743fea8e8138 (diff) | |
| download | linux-stable-021805af5bedeafc76c117fc771c100b358ab419.tar.gz linux-stable-021805af5bedeafc76c117fc771c100b358ab419.tar.bz2 linux-stable-021805af5bedeafc76c117fc771c100b358ab419.zip | |
efi: capsule-loader: Fix use-after-free in efi_capsule_write
commit 9cb636b5f6a8cc6d1b50809ec8f8d33ae0c84c95 upstream.
A race condition may occur if the user calls close() on another thread
during a write() operation on the device node of the efi capsule.
This is a race condition that occurs between the efi_capsule_write() and
efi_capsule_flush() functions of efi_capsule_fops, which ultimately
results in UAF.
So, the page freeing process is modified to be done in
efi_capsule_release() instead of efi_capsule_flush().
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
Link: https://lore.kernel.org/all/20220907102920.GA88602@ubuntu/
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions