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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-11-15 11:12:22 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-25 11:25:32 +1100 |
| commit | 8b8a8f0ab3f5519e45c526f826a655817486c5bb (patch) | |
| tree | 582258ab2bd7909fa1abeb803043832923002863 /arch/powerpc/lib/code-patching.c | |
| parent | a3bcfc182b2c968fd740101322bd128844724961 (diff) | |
| download | linux-8b8a8f0ab3f5519e45c526f826a655817486c5bb.tar.gz | |
powerpc/code-patching: Improve verification of patchability
Today, patch_instruction() assumes that it is called exclusively on valid addresses, and only checks that it is not called on an init address after init section has been freed. Improve verification by calling kernel_text_address() instead. kernel_text_address() already includes a verification of initmem release. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bc683d499a411730504b132a924de0ccc2ef1f79.1636971137.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index c5ed98823835..5e2fe133639e 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -190,10 +190,9 @@ static int do_patch_instruction(u32 *addr, struct ppc_inst instr) int patch_instruction(u32 *addr, struct ppc_inst instr) { /* Make sure we aren't patching a freed init section */ - if (init_mem_is_free && init_section_contains(addr, 4)) { - pr_debug("Skipping init section patching addr: 0x%px\n", addr); + if (!kernel_text_address((unsigned long)addr)) return 0; - } + return do_patch_instruction(addr, instr); } NOKPROBE_SYMBOL(patch_instruction); |