| Message ID | 20210506043452.9674-10-cmr@linux.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Use per-CPU temporary mappings for patching | expand |
| Related | show |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch powerpc/merge (7619d98e5041d5c25aba5428704dba6121237a9a) |
| snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 16 lines checked |
| snowpatch_ozlabs/needsstable | success | Patch has no Fixes tags |
diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c index 55c3bec6d3b72..af9bf285fe326 100644 --- a/drivers/misc/lkdtm/perms.c +++ b/drivers/misc/lkdtm/perms.c @@ -268,16 +268,7 @@ static inline u32 lkdtm_read_patch_site(void) /* Returns True if the write succeeds */ static inline bool lkdtm_try_write(u32 data, u32 *addr) { -#ifdef CONFIG_PPC - __put_kernel_nofault(addr, &data, u32, err); - return true; - -err: - return false; -#endif -#ifdef CONFIG_X86_64 return !__put_user(data, addr); -#endif } static int lkdtm_patching_cpu(void *data)
Code patching on powerpc with a STRICT_KERNEL_RWX uses a userspace address in a temporary mm now. Use __put_user() to avoid write failures due to KUAP when attempting a "hijack" on the patching address. Signed-off-by: Christopher M. Riedl <cmr@linux.ibm.com> --- drivers/misc/lkdtm/perms.c | 9 --------- 1 file changed, 9 deletions(-)