]> Git Repo - linux.git/commit
x86,kprobes: Fix optprobe trampoline to generate complete pt_regs
authorMasami Hiramatsu <[email protected]>
Sat, 26 Mar 2022 02:27:40 +0000 (11:27 +0900)
committerAlexei Starovoitov <[email protected]>
Tue, 29 Mar 2022 02:38:51 +0000 (19:38 -0700)
commit45c23bf4d1a416d32e509f83719a7399e35bdaf9
tree173ff987862f7193b5b7145b96c510ae3d8841b2
parent0ef6f5c09371f17e142814e6996d6dfb8741925b
x86,kprobes: Fix optprobe trampoline to generate complete pt_regs

Currently the optprobe trampoline template code ganerate an
almost complete pt_regs on-stack, everything except regs->ss.
The 'regs->ss' points to the top of stack, which is not a
valid segment decriptor.

As same as the rethook does, complete the job by also pushing ss.

Suggested-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/164826166027.2455864.14759128090648961900.stgit@devnote2
arch/x86/kernel/kprobes/opt.c
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