x86: Rewrite ret_from_fork() in C

Browse source

When kCFI is enabled, special handling is needed for the indirect call
to the kernel thread function.  Rewrite the ret_from_fork() function in
C so that the compiler can properly handle the indirect call.

Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lkml.kernel.org/r/20230623225529.34590-3-brgerst@gmail.com

...

This commit is contained in:

Brian Gerst 2023-06-23 18:55:29 -04:00 • committed by Peter Zijlstra

parent 81f755d561

commit 3aec4ecb3d

4 changed files with 40 additions and 49 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

30

arch/x86/entry/entry_32.S

View file

33

arch/x86/entry/entry_64.S

View file

4

arch/x86/include/asm/switch_to.h

View file

22

arch/x86/kernel/process.c

View file