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Fix a bug in libvmmapi 'vm_copy_setup()' where it would return success even if
the 'gpa' was in the guest MMIO region. This would manifest as a segmentation fault in 'vm_map_copyin()' or 'vm_map_copyout()' because 'vm_map_gpa()' would return NULL for this 'gpa'. Fix this by calling 'vm_map_gpa()' in 'vm_copy_setup' and returning a failure if the 'gpa' cannot be mapped. This matches the behavior of 'vm_copy_setup()' in vmm.ko. MFC after: 1 week
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parent
e15138e574
commit
009e2acba6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=277359
@ -987,6 +987,7 @@ int
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vm_copy_setup(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
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uint64_t gla, size_t len, int prot, struct iovec *iov, int iovcnt)
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{
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void *va;
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uint64_t gpa;
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int error, fault, i, n, off;
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@ -1006,7 +1007,11 @@ vm_copy_setup(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
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off = gpa & PAGE_MASK;
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n = min(len, PAGE_SIZE - off);
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iov->iov_base = (void *)gpa;
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va = vm_map_gpa(ctx, gpa, n);
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if (va == NULL)
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return (-1);
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iov->iov_base = va;
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iov->iov_len = n;
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iov++;
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iovcnt--;
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@ -1017,20 +1022,25 @@ vm_copy_setup(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
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return (0);
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}
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void
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vm_copy_teardown(struct vmctx *ctx, int vcpu, struct iovec *iov, int iovcnt)
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{
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return;
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}
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void
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vm_copyin(struct vmctx *ctx, int vcpu, struct iovec *iov, void *vp, size_t len)
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{
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const char *src;
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char *dst;
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uint64_t gpa;
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size_t n;
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dst = vp;
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while (len) {
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assert(iov->iov_len);
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gpa = (uint64_t)iov->iov_base;
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n = min(len, iov->iov_len);
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src = vm_map_gpa(ctx, gpa, n);
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src = iov->iov_base;
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bcopy(src, dst, n);
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iov++;
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@ -1045,15 +1055,13 @@ vm_copyout(struct vmctx *ctx, int vcpu, const void *vp, struct iovec *iov,
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{
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const char *src;
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char *dst;
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uint64_t gpa;
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size_t n;
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src = vp;
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while (len) {
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assert(iov->iov_len);
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gpa = (uint64_t)iov->iov_base;
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n = min(len, iov->iov_len);
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dst = vm_map_gpa(ctx, gpa, n);
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dst = iov->iov_base;
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bcopy(src, dst, n);
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iov++;
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@ -137,6 +137,8 @@ void vm_copyin(struct vmctx *ctx, int vcpu, struct iovec *guest_iov,
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void *host_dst, size_t len);
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void vm_copyout(struct vmctx *ctx, int vcpu, const void *host_src,
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struct iovec *guest_iov, size_t len);
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void vm_copy_teardown(struct vmctx *ctx, int vcpu, struct iovec *iov,
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int iovcnt);
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/* RTC */
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int vm_rtc_write(struct vmctx *ctx, int offset, uint8_t value);
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