This is a note to let you know that I've just added the patch titled
x86/pkeys: Change caller of update_pkru_in_sigframe()
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-pkeys-change-caller-of-update_pkru_in_sigframe.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5683d0ce8fb46f36315a2b508f90ec6221cda018
Author: Aruna Ramakrishna <aruna.ramakrishna@xxxxxxxxxx>
Date: Tue Nov 19 17:45:19 2024 +0000
x86/pkeys: Change caller of update_pkru_in_sigframe()
[ Upstream commit 6a1853bdf17874392476b552398df261f75503e0 ]
update_pkru_in_sigframe() will shortly need some information which
is only available inside xsave_to_user_sigframe(). Move
update_pkru_in_sigframe() inside the other function to make it
easier to provide it that information.
No functional changes.
Signed-off-by: Aruna Ramakrishna <aruna.ramakrishna@xxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20241119174520.3987538-2-aruna.ramakrishna%40oracle.com
Stable-dep-of: ae6012d72fa6 ("x86/pkeys: Ensure updated PKRU value is XRSTOR'd")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 1065ab995305c..8f62e0666dea5 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -63,16 +63,6 @@ static inline bool check_xstate_in_sigframe(struct fxregs_state __user *fxbuf,
return true;
}
-/*
- * Update the value of PKRU register that was already pushed onto the signal frame.
- */
-static inline int update_pkru_in_sigframe(struct xregs_state __user *buf, u32 pkru)
-{
- if (unlikely(!cpu_feature_enabled(X86_FEATURE_OSPKE)))
- return 0;
- return __put_user(pkru, (unsigned int __user *)get_xsave_addr_user(buf, XFEATURE_PKRU));
-}
-
/*
* Signal frame handlers.
*/
@@ -168,14 +158,8 @@ static inline bool save_xstate_epilog(void __user *buf, int ia32_frame,
static inline int copy_fpregs_to_sigframe(struct xregs_state __user *buf, u32 pkru)
{
- int err = 0;
-
- if (use_xsave()) {
- err = xsave_to_user_sigframe(buf);
- if (!err)
- err = update_pkru_in_sigframe(buf, pkru);
- return err;
- }
+ if (use_xsave())
+ return xsave_to_user_sigframe(buf, pkru);
if (use_fxsr())
return fxsave_to_user_sigframe((struct fxregs_state __user *) buf);
diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index 0b86a5002c846..6b2924fbe5b8d 100644
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -69,6 +69,16 @@ static inline u64 xfeatures_mask_independent(void)
return fpu_kernel_cfg.independent_features;
}
+/*
+ * Update the value of PKRU register that was already pushed onto the signal frame.
+ */
+static inline int update_pkru_in_sigframe(struct xregs_state __user *buf, u32 pkru)
+{
+ if (unlikely(!cpu_feature_enabled(X86_FEATURE_OSPKE)))
+ return 0;
+ return __put_user(pkru, (unsigned int __user *)get_xsave_addr_user(buf, XFEATURE_PKRU));
+}
+
/* XSAVE/XRSTOR wrapper functions */
#ifdef CONFIG_X86_64
@@ -256,7 +266,7 @@ static inline u64 xfeatures_need_sigframe_write(void)
* The caller has to zero buf::header before calling this because XSAVE*
* does not touch the reserved fields in the header.
*/
-static inline int xsave_to_user_sigframe(struct xregs_state __user *buf)
+static inline int xsave_to_user_sigframe(struct xregs_state __user *buf, u32 pkru)
{
/*
* Include the features which are not xsaved/rstored by the kernel
@@ -281,6 +291,9 @@ static inline int xsave_to_user_sigframe(struct xregs_state __user *buf)
XSTATE_OP(XSAVE, buf, lmask, hmask, err);
clac();
+ if (!err)
+ err = update_pkru_in_sigframe(buf, pkru);
+
return err;
}
