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Kernel: Clear ESI and EDI on syscall entry

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Since these are not part of the system call convention, we don't care
what userspace had in there. Might as well scrub it before entering
the kernel.

I would scrub EBP too, but that breaks the comfy kernel-thru-userspace
stack traces we currently get. It can be done with some effort.
This commit is contained in:
Andreas Kling 2020-01-25 10:17:45 +01:00
parent 3f52cee595
commit e576c9e952
Notes: sideshowbarker 2024-07-19 09:50:40 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/e576c9e952f
1 changed files with 2 additions and 0 deletions
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Kernel/Syscall.cpp
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@ -48,6 +48,8 @@ asm(
" mov %ax, %ds\n"
" mov %ax, %es\n"
" cld\n"
" xor %esi, %esi\n"
" xor %edi, %edi\n"
" call syscall_handler\n"
" add $0x4, %esp\n"
" popl %gs\n"