diff options
| 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 /arch/x86/boot/compressed | |
| parent | x86/sev: Check IOBM for IOIO exceptions from user-space (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 'arch/x86/boot/compressed')
| -rw-r--r-- | arch/x86/boot/compressed/sev.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index afd91041ec3e..80d76aea1f7b 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -108,6 +108,11 @@ static enum es_result vc_ioio_check(struct es_em_ctxt *ctxt, u16 port, size_t si return ES_OK; } +static bool fault_in_kernel_space(unsigned long address) +{ + return false; +} + #undef __init #define __init |