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x86: Remove force_iret()

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force_iret() was originally intended to prevent the return to user mode with
the SYSRET or SYSEXIT instructions, in cases where the register state could
have been changed to be incompatible with those instructions.  The entry code
has been significantly reworked since then, and register state is validated
before SYSRET or SYSEXIT are used.  force_iret() no longer serves its original
purpose and can be eliminated.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lkml.kernel.org/r/20191219115812.102620-1-brgerst@gmail.com
This commit is contained in:
Brian Gerst
2019-12-19 06:58:12 -05:00
committed by Borislav Petkov
parent f444a5ff95
commit 2b10906f2d
7 changed files with 0 additions and 32 deletions
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arch/x86/kernel/process_32.c
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@@ -124,7 +124,6 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
regs->ip = new_ip;
regs->sp = new_sp;
regs->flags = X86_EFLAGS_IF;
force_iret();
}
EXPORT_SYMBOL_GPL(start_thread);