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sparc64: fix misuses of access_process_vm() in genregs32_[sg]et()

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We do need access_process_vm() to access the target's reg_window.
However, access to caller's memory (storing the result in
genregs32_get(), fetching the new values in case of genregs32_set())
should be done by normal uaccess primitives.

Fixes: ad4f957640 ([SPARC64]: Fix user accesses in regset code.)
Cc: stable@kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-05-17 15:37:50 -04:00
parent 8f3d9f3542
commit 142cd25293
1 changed files with 3 additions and 14 deletions
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17
arch/sparc/kernel/ptrace_64.c
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@ -572,19 +572,13 @@ static int genregs32_get(struct task_struct *target,
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
&reg_window[pos++],
&reg, sizeof(reg),
FOLL_FORCE)
!= sizeof(reg))
return -EFAULT;
if (access_process_vm(target,
(unsigned long) u,
&reg, sizeof(reg),
FOLL_FORCE | FOLL_WRITE)
!= sizeof(reg))
if (put_user(reg, u++))
return -EFAULT;
pos++;
u++;
}
}
}
@ -684,12 +678,7 @@ static int genregs32_set(struct task_struct *target,
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
u,
&reg, sizeof(reg),
FOLL_FORCE)
!= sizeof(reg))
if (get_user(reg, u++))
return -EFAULT;
if (access_process_vm(target,
(unsigned long)