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| author | Joerg Roedel <jroedel@suse.de> | 2023-10-16 14:42:50 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-10-17 10:58:16 +0200 |
| commit | 63e44bc52047f182601e7817da969a105aa1f721 (patch) | |
| tree | 3a627e7e557da4e8273458595a8483fab82b2fa4 /io_uring/tctx.c | |
| parent | b9cb9c45583b911e0db71d09caa6b56469eb2bdf (diff) | |
| download | linux-63e44bc52047f182601e7817da969a105aa1f721.tar.gz linux-63e44bc52047f182601e7817da969a105aa1f721.tar.bz2 linux-63e44bc52047f182601e7817da969a105aa1f721.zip | |
x86/sev: Check for user-space IOIO pointing to kernel space
Check the memory operand of INS/OUTS before emulating the instruction.
The #VC exception can get raised from user-space, but the memory operand
can be manipulated to access kernel memory before the emulation actually
begins and after the exception handler has run.
[ bp: Massage commit message. ]
Fixes: 597cfe48212a ("x86/boot/compressed/64: Setup a GHCB-based VC Exception handler")
Reported-by: Tom Dohrmann <erbse.13@gmx.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Diffstat (limited to 'io_uring/tctx.c')
0 files changed, 0 insertions, 0 deletions