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x86/vsyscall_emu/64: Don't use RET in vsyscall emulation

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commit 15583e514e upstream.

This is userspace code and doesn't play by the normal kernel rules.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2022-06-14 23:15:43 +02:00 • committed by Greg Kroah-Hartman
commit d6eb50e9b7
1 changed files with 6 additions and 3 deletions
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9
arch/x86/entry/vsyscall/vsyscall_emu_64.S
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@ -19,17 +19,20 @@ __vsyscall_page:
mov $__NR_gettimeofday, %rax
syscall
RET
ret
int3
.balign 1024, 0xcc
mov $__NR_time, %rax
syscall
RET
ret
int3
.balign 1024, 0xcc
mov $__NR_getcpu, %rax
syscall
RET
ret
int3
.balign 4096, 0xcc