diff mbox series

[bpf,v2,1/3] x86/mm: Move is_vsyscall_vaddr() into asm/vsyscall.h

Message ID 20240126115423.3943360-2-houtao@huaweicloud.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Fix the read of vsyscall page through bpf | expand

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Commit Message

Hou Tao Jan. 26, 2024, 11:54 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

Moving is_vsyscall_vaddr() into asm/vsyscall.h to make it available for
copy_from_kernel_nofault_allowed() in arch/x86/mm/maccess.c.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 arch/x86/include/asm/vsyscall.h | 10 ++++++++++
 arch/x86/mm/fault.c             |  9 ---------
 2 files changed, 10 insertions(+), 9 deletions(-)

Comments

Sohil Mehta Jan. 29, 2024, 11:56 p.m. UTC | #1 
On 1/26/2024 3:54 AM, Hou Tao wrote:
> From: Hou Tao <houtao1@huawei.com>
> 
> Moving is_vsyscall_vaddr() into asm/vsyscall.h to make it available for

s/Moving/Move

> copy_from_kernel_nofault_allowed() in arch/x86/mm/maccess.c.
> 
> Signed-off-by: Hou Tao <houtao1@huawei.com>
> ---
>  arch/x86/include/asm/vsyscall.h | 10 ++++++++++
>  arch/x86/mm/fault.c             |  9 ---------
>  2 files changed, 10 insertions(+), 9 deletions(-)
> 


Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Hou Tao Jan. 30, 2024, 4:20 a.m. UTC | #2 
On 1/30/2024 7:56 AM, Sohil Mehta wrote:
> On 1/26/2024 3:54 AM, Hou Tao wrote:
>> From: Hou Tao <houtao1@huawei.com>
>>
>> Moving is_vsyscall_vaddr() into asm/vsyscall.h to make it available for
> s/Moving/Move

Will update in v3.
>
>> copy_from_kernel_nofault_allowed() in arch/x86/mm/maccess.c.
>>
>> Signed-off-by: Hou Tao <houtao1@huawei.com>
>> ---
>>  arch/x86/include/asm/vsyscall.h | 10 ++++++++++
>>  arch/x86/mm/fault.c             |  9 ---------
>>  2 files changed, 10 insertions(+), 9 deletions(-)
>>
>
> Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>

Thank you for the review and all of your suggestions.
diff mbox series

Patch

diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h
index ab60a71a8dcb9..472f0263dbc61 100644
--- a/arch/x86/include/asm/vsyscall.h
+++ b/arch/x86/include/asm/vsyscall.h
@@ -4,6 +4,7 @@ 
 
 #include <linux/seqlock.h>
 #include <uapi/asm/vsyscall.h>
+#include <asm/page_types.h>
 
 #ifdef CONFIG_X86_VSYSCALL_EMULATION
 extern void map_vsyscall(void);
@@ -24,4 +25,13 @@  static inline bool emulate_vsyscall(unsigned long error_code,
 }
 #endif
 
+/*
+ * The (legacy) vsyscall page is the long page in the kernel portion
+ * of the address space that has user-accessible permissions.
+ */
+static inline bool is_vsyscall_vaddr(unsigned long vaddr)
+{
+	return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR);
+}
+
 #endif /* _ASM_X86_VSYSCALL_H */
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 679b09cfe241c..d6375b3c633bc 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -798,15 +798,6 @@  show_signal_msg(struct pt_regs *regs, unsigned long error_code,
 	show_opcodes(regs, loglvl);
 }
 
-/*
- * The (legacy) vsyscall page is the long page in the kernel portion
- * of the address space that has user-accessible permissions.
- */
-static bool is_vsyscall_vaddr(unsigned long vaddr)
-{
-	return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR);
-}
-
 static void
 __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
 		       unsigned long address, u32 pkey, int si_code)