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x86/fpu: Limit xstate copy size in xstateregs_set()

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If the count argument is larger than the xstate size, this will happily
copy beyond the end of xstate.

Fixes: 91c3dba7dbc1 ("x86/fpu/xstate: Fix PTRACE frames for XSAVES")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121452.120741557@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:01:35 +02:00 committed by Borislav Petkov
parent e68524456c
commit 07d6688b22
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/fpu/regset.c
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@ -117,7 +117,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
/*
* A whole standard-format XSAVE buffer is needed:
*/
if ((pos != 0) || (count < fpu_user_xstate_size))
if (pos != 0 || count != fpu_user_xstate_size)
return -EFAULT;
xsave = &fpu->state.xsave;