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| author | Ingo Molnar <mingo@kernel.org> | 2019-12-25 12:41:37 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-12-25 12:41:37 +0300 |
| commit | 1e5f8a308551b9816588e12bb795aeadebe37c4a (patch) | |
| tree | bd71fc796fed24a3b7cc99df4a1d1bdaecc2b387 /arch/arm64/include/asm/uaccess.h | |
| parent | a5e37de90e67ac1072a9a44bd0cec9f5e98ded08 (diff) | |
| parent | 46cf053efec6a3a5f343fead837777efe8252a46 (diff) | |
| download | linux-1e5f8a308551b9816588e12bb795aeadebe37c4a.tar.xz | |
Merge tag 'v5.5-rc3' into sched/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/uaccess.h')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 127712b0b970..32fc8061aa76 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -62,8 +62,13 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si { unsigned long ret, limit = current_thread_info()->addr_limit; + /* + * Asynchronous I/O running in a kernel thread does not have the + * TIF_TAGGED_ADDR flag of the process owning the mm, so always untag + * the user address before checking. + */ if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI) && - test_thread_flag(TIF_TAGGED_ADDR)) + (current->flags & PF_KTHREAD || test_thread_flag(TIF_TAGGED_ADDR))) addr = untagged_addr(addr); __chk_user_ptr(addr); |