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x86: copy_fpstate_to_sigframe(): have fpregs_soft_get() use kernel buffer

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... then copy_to_user() the results

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-02-21 00:11:55 -05:00
parent b3a9e3b962
commit 36c8673f90
1 changed files with 6 additions and 6 deletions
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12
arch/x86/kernel/fpu/signal.c
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@ -170,14 +170,14 @@ int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
ia32_fxstate &= (IS_ENABLED(CONFIG_X86_32) || ia32_fxstate &= (IS_ENABLED(CONFIG_X86_32) ||
IS_ENABLED(CONFIG_IA32_EMULATION)); IS_ENABLED(CONFIG_IA32_EMULATION));
if (!static_cpu_has(X86_FEATURE_FPU)) {
struct user_i387_ia32_struct fp;
fpregs_soft_get(current, NULL, 0, sizeof(fp), &fp, NULL);
return copy_to_user(buf, &fp, sizeof(fp)) ? -EFAULT : 0;
}
if (!access_ok(buf, size)) if (!access_ok(buf, size))
return -EACCES; return -EACCES;
if (!static_cpu_has(X86_FEATURE_FPU))
return fpregs_soft_get(current, NULL, 0,
sizeof(struct user_i387_ia32_struct), NULL,
(struct _fpstate_32 __user *) buf) ? -1 : 1;
retry: retry:
/* /*
* Load the FPU registers if they are not valid for the current task. * Load the FPU registers if they are not valid for the current task.