From 67c0350d5df279382b70bdc114e615bc714424ea Mon Sep 17 00:00:00 2001 From: Michael Sterritt Date: Fri, 19 Nov 2021 15:27:57 -0800 Subject: [PATCH] x86/sev: Fix SEV-ES INS/OUTS instructions for word, dword, and qword Properly type the operands being passed to __put_user()/__get_user(). Otherwise, these routines truncate data for dependent instructions (e.g., INSW) and only read/write one byte. This has been tested by sending a string with REP OUTSW to a port and then reading it back in with REP INSW on the same port. Previous behavior was to only send and receive the first char of the size. For example, word operations for "abcd" would only read/write "ac". With change, the full string is now written and read back. Fixes: 9439a3a1ab8b3 (x86/sev-es: Compile early handler code into kernel image) Signed-off-by: Michael Sterritt Signed-off-by: Borislav Petkov Reviewed-by: Paolo Bonzini Reviewed-by: Marc Orr Reviewed-by: Peter Gonda Reviewed-by: Joerg Roedel Link: https://lkml.kernel.org/r/20211119232757.176201-1-sterritt@google.com --- arch/x86/kernel/sev.c | 57 +++++++++++++++++++++++++++++-------------- 1 file changed, 39 insertions(+), 18 deletions(-) diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 74f0ec9553848..a9fc2ac7a8bd5 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -294,11 +294,6 @@ static enum es_result vc_write_mem(struct es_em_ctxt *ctxt, char *dst, char *buf, size_t size) { unsigned long error_code = X86_PF_PROT | X86_PF_WRITE; - char __user *target = (char __user *)dst; - u64 d8; - u32 d4; - u16 d2; - u8 d1; /* * This function uses __put_user() independent of whether kernel or user @@ -320,26 +315,42 @@ static enum es_result vc_write_mem(struct es_em_ctxt *ctxt, * instructions here would cause infinite nesting. */ switch (size) { - case 1: + case 1: { + u8 d1; + u8 __user *target = (u8 __user *)dst; + memcpy(&d1, buf, 1); if (__put_user(d1, target)) goto fault; break; - case 2: + } + case 2: { + u16 d2; + u16 __user *target = (u16 __user *)dst; + memcpy(&d2, buf, 2); if (__put_user(d2, target)) goto fault; break; - case 4: + } + case 4: { + u32 d4; + u32 __user *target = (u32 __user *)dst; + memcpy(&d4, buf, 4); if (__put_user(d4, target)) goto fault; break; - case 8: + } + case 8: { + u64 d8; + u64 __user *target = (u64 __user *)dst; + memcpy(&d8, buf, 8); if (__put_user(d8, target)) goto fault; break; + } default: WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size); return ES_UNSUPPORTED; @@ -362,11 +373,6 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, char *src, char *buf, size_t size) { unsigned long error_code = X86_PF_PROT; - char __user *s = (char __user *)src; - u64 d8; - u32 d4; - u16 d2; - u8 d1; /* * This function uses __get_user() independent of whether kernel or user @@ -388,26 +394,41 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, * instructions here would cause infinite nesting. */ switch (size) { - case 1: + case 1: { + u8 d1; + u8 __user *s = (u8 __user *)src; + if (__get_user(d1, s)) goto fault; memcpy(buf, &d1, 1); break; - case 2: + } + case 2: { + u16 d2; + u16 __user *s = (u16 __user *)src; + if (__get_user(d2, s)) goto fault; memcpy(buf, &d2, 2); break; - case 4: + } + case 4: { + u32 d4; + u32 __user *s = (u32 __user *)src; + if (__get_user(d4, s)) goto fault; memcpy(buf, &d4, 4); break; - case 8: + } + case 8: { + u64 d8; + u64 __user *s = (u64 __user *)src; if (__get_user(d8, s)) goto fault; memcpy(buf, &d8, 8); break; + } default: WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size); return ES_UNSUPPORTED; -- 2.39.5