diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2021-12-04 16:43:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-25 12:26:29 +0300 |
| commit | 1f6e6683c46612baf01555e214d863aaa03c399b (patch) | |
| tree | 99bb3050b193551eabb4e1d61d8a3f4feda116ae /tools | |
| parent | 277f4ddc36c578691678b8ae59b60d76ad15fa1b (diff) | |
| download | linux-1f6e6683c46612baf01555e214d863aaa03c399b.tar.xz | |
x86/alternative: Relax text_poke_bp() constraint
commit 26c44b776dba4ac692a0bf5a3836feb8a63fea6b upstream.
Currently, text_poke_bp() is very strict to only allow patching a
single instruction; however with straight-line-speculation it will be
required to patch: ret; int3, which is two instructions.
As such, relax the constraints a little to allow int3 padding for all
instructions that do not imply the execution of the next instruction,
ie: RET, JMP.d8 and JMP.d32.
While there, rename the text_poke_loc::rel32 field to ::disp.
Note: this fills up the text_poke_loc structure which is now a round
16 bytes big.
[ bp: Put comments ontop instead of on the side. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211204134908.082342723@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions