diff options
| author |   Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2025-05-03 09:46:31 -0700 |
|---|---|---|
| committer |   Dave Hansen <dave.hansen@linux.intel.com> | 2025-05-09 13:33:35 -0700 |
| commit | ebebe30794d38c51f71fe4951ba6af4159d9837d (patch) | |
| tree | aab5d921d9943e0e15ab3682f8085b96213688fa | |
| parent | mm/execmem: Unify early execmem_cache behaviour (diff) | |
| download | wireguard-linux-ebebe30794d38c51f71fe4951ba6af4159d9837d.tar.xz wireguard-linux-ebebe30794d38c51f71fe4951ba6af4159d9837d.zip | |
x86/ibt: Keep IBT disabled during alternative patching
cfi_rewrite_callers() updates the fineIBT hash matching at the caller side,
but except for paranoid-mode it relies on apply_retpoline() and friends for
any ENDBR relocation. This could temporarily cause an indirect branch to
land on a poisoned ENDBR.
For instance, with para-virtualization enabled, a simple wrmsrl() could
have an indirect branch pointing to native_write_msr() who's ENDBR has been
relocated due to fineIBT:
<wrmsrl>:
push %rbp
mov %rsp,%rbp
mov %esi,%eax
mov %rsi,%rdx
shr $0x20,%rdx
mov %edi,%edi
mov %rax,%rsi
call *0x21e65d0(%rip) # <pv_ops+0xb8>
^^^^^^^^^^^^^^^^^^^^^^^
Such an indirect call during the alternative patching could #CP if the
caller is not *yet* adjusted for the new target ENDBR. To prevent a false
#CP, keep CET-IBT disabled until all callers are patched.
Patching during the module load does not need to be guarded by IBT-disable
because the module code is not executed until the patching is complete.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/alternative.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 3e67e72bffdc..6e0b09b2c972 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -31,6 +31,7 @@ #include <asm/paravirt.h> #include <asm/asm-prototypes.h> #include <asm/cfi.h> +#include <asm/ibt.h> int __read_mostly alternatives_patched; @@ -2085,6 +2086,8 @@ static noinline void __init alt_reloc_selftest(void) void __init alternative_instructions(void) { + u64 ibt; + int3_selftest(); /* @@ -2111,6 +2114,9 @@ void __init alternative_instructions(void) */ paravirt_set_cap(); + /* Keep CET-IBT disabled until caller/callee are patched */ + ibt = ibt_save(/*disable*/ true); + __apply_fineibt(__retpoline_sites, __retpoline_sites_end, __cfi_sites, __cfi_sites_end, true); @@ -2134,6 +2140,8 @@ void __init alternative_instructions(void) */ apply_seal_endbr(__ibt_endbr_seal, __ibt_endbr_seal_end); + ibt_restore(ibt); + #ifdef CONFIG_SMP /* Patch to UP if other cpus not imminent. */ if (!noreplace_smp && (num_present_cpus() == 1 || setup_max_cpus <= 1)) { |