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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-06-23 15:01:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:00:31 +0300 |
| commit | 29e9a35b400b978aa541f9f97698af1651bed05c (patch) | |
| tree | c66cb3b6152935c5c414bbde242083087f73550d /arch/x86 | |
| parent | a04e670b07df36612522731b1de2b013beade21c (diff) | |
| download | linux-29e9a35b400b978aa541f9f97698af1651bed05c.tar.xz | |
x86/fpu: Limit xstate copy size in xstateregs_set()
[ Upstream commit 07d6688b22e09be465652cf2da0da6bf86154df6 ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/fpu/regset.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c index c413756ba89f..6bb874441de8 100644 --- a/arch/x86/kernel/fpu/regset.c +++ b/arch/x86/kernel/fpu/regset.c @@ -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; |