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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[SPARC64]: Fix user accesses in regset code.
If target is not current we need to use access_process_vm(). Noticed by Roland McGrath. Signed-off-by: David S. Miller <davem@davemloft.net>
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7c3cce978e
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@ -138,8 +138,17 @@ static int genregs64_get(struct task_struct *target,
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(regs->u_regs[UREG_I6] + STACK_BIAS);
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unsigned long window[16];
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if (copy_from_user(window, reg_window, sizeof(window)))
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return -EFAULT;
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if (target == current) {
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if (copy_from_user(window, reg_window, sizeof(window)))
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return -EFAULT;
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} else {
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if (access_process_vm(target,
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(unsigned long) reg_window,
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window,
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sizeof(window), 0) !=
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sizeof(window))
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return -EFAULT;
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}
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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window,
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@ -190,16 +199,37 @@ static int genregs64_set(struct task_struct *target,
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(regs->u_regs[UREG_I6] + STACK_BIAS);
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unsigned long window[16];
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if (copy_from_user(window, reg_window, sizeof(window)))
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return -EFAULT;
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if (target == current) {
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if (copy_from_user(window, reg_window, sizeof(window)))
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return -EFAULT;
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} else {
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if (access_process_vm(target,
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(unsigned long) reg_window,
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window,
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sizeof(window), 0) !=
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sizeof(window))
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return -EFAULT;
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}
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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window,
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16 * sizeof(u64),
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32 * sizeof(u64));
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if (!ret &&
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copy_to_user(reg_window, window, sizeof(window)))
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return -EFAULT;
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if (!ret) {
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if (target == current) {
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if (copy_to_user(reg_window, window,
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sizeof(window)))
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return -EFAULT;
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} else {
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if (access_process_vm(target,
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(unsigned long)
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reg_window,
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window,
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sizeof(window), 1) !=
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sizeof(window))
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return -EFAULT;
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}
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}
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}
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if (!ret && count > 0) {
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@ -412,9 +442,22 @@ static int genregs32_get(struct task_struct *target,
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*k++ = regs->u_regs[pos++];
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reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(*k++, ®_window[pos++]))
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return -EFAULT;
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if (target == current) {
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for (; count > 0 && pos < 32; count--) {
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if (get_user(*k++, ®_window[pos++]))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 32; count--) {
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if (access_process_vm(target,
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(unsigned long)
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®_window[pos],
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k, sizeof(*k), 0)
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!= sizeof(*k))
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return -EFAULT;
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k++;
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pos++;
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}
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}
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} else {
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for (; count > 0 && pos < 16; count--) {
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@ -423,10 +466,28 @@ static int genregs32_get(struct task_struct *target,
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}
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reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, ®_window[pos++]) ||
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put_user(reg, u++))
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return -EFAULT;
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if (target == current) {
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, ®_window[pos++]) ||
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put_user(reg, u++))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 32; count--) {
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if (access_process_vm(target,
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(unsigned long)
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®_window[pos],
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®, sizeof(reg), 0)
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!= sizeof(reg))
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return -EFAULT;
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if (access_process_vm(target,
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(unsigned long) u,
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®, sizeof(reg), 1)
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!= sizeof(reg))
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return -EFAULT;
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pos++;
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u++;
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}
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}
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}
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while (count > 0) {
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@ -488,9 +549,23 @@ static int genregs32_set(struct task_struct *target,
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regs->u_regs[pos++] = *k++;
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reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (put_user(*k++, ®_window[pos++]))
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return -EFAULT;
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if (target == current) {
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for (; count > 0 && pos < 32; count--) {
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if (put_user(*k++, ®_window[pos++]))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 32; count--) {
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if (access_process_vm(target,
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(unsigned long)
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®_window[pos],
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(void *) k,
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sizeof(*k), 1)
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!= sizeof(*k))
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return -EFAULT;
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k++;
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pos++;
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}
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}
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} else {
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for (; count > 0 && pos < 16; count--) {
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@ -500,10 +575,29 @@ static int genregs32_set(struct task_struct *target,
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}
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reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, u++) ||
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put_user(reg, ®_window[pos++]))
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return -EFAULT;
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if (target == current) {
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, u++) ||
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put_user(reg, ®_window[pos++]))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 32; count--) {
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if (access_process_vm(target,
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(unsigned long)
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u,
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®, sizeof(reg), 0)
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!= sizeof(reg))
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return -EFAULT;
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if (access_process_vm(target,
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(unsigned long)
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®_window[pos],
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®, sizeof(reg), 1)
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!= sizeof(reg))
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return -EFAULT;
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pos++;
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u++;
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}
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}
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}
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while (count > 0) {
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