Messages in this thread | | | From | Brian Gerst <> | Subject | [PATCH v2 0/2] Rewrite ret_from_fork() in C | Date | Fri, 23 Jun 2023 18:55:27 -0400 |
| |
When kCFI is enabled, special handling is needed for the indirect call to the kernel thread function. Handling this in pure assembly is not simple, so moving it to C is more appropriate. Instead of moving just the indirect call to C as Peter Zijlstra has proposed, this patchset rewrites the whole ret_from_fork() function in C (other than some necessary asm glue remaning).
V2: - Fixed wrong address of pt_regs being passed - Simplified 64-bit asm stub to not use a tail-call
Brian Gerst (2): x86/32: Remove schedule_tail_wrapper() x86: Rewrite ret_from_fork() in C
arch/x86/entry/entry_32.S | 53 ++++++++------------------------ arch/x86/entry/entry_64.S | 33 +++++--------------- arch/x86/include/asm/switch_to.h | 4 ++- arch/x86/kernel/process.c | 22 ++++++++++++- 4 files changed, 45 insertions(+), 67 deletions(-)
-- 2.41.0
| |