From 4322c8f81c58da493a3c46eda32f0e7534a350a0 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Mon, 17 Nov 2025 17:43:44 +0100 Subject: lib/strn*,uaccess: Use masked_user_{read/write}_access_begin when required Properly use masked_user_read_access_begin() and masked_user_write_access_begin() instead of masked_user_access_begin() in order to match user_read_access_end() and user_write_access_end(). This is important for architectures like PowerPC that enable separately user reads and user writes. That means masked_user_read_access_begin() is used when user memory is exclusively read during the window and masked_user_write_access_begin() is used when user memory is exclusively writen during the window. masked_user_access_begin() remains and is used when both reads and writes are performed during the open window. Each of them is expected to be terminated by the matching user_read_access_end(), user_write_access_end() and user_access_end(). Signed-off-by: Christophe Leroy Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/cb5e4b0fa49ea9c740570949d5e3544423389757.1763396724.git.christophe.leroy@csgroup.eu --- lib/strnlen_user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/strnlen_user.c') diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c index 6e489f9e90f1..4a6574b67f82 100644 --- a/lib/strnlen_user.c +++ b/lib/strnlen_user.c @@ -99,7 +99,7 @@ long strnlen_user(const char __user *str, long count) if (can_do_masked_user_access()) { long retval; - str = masked_user_access_begin(str); + str = masked_user_read_access_begin(str); retval = do_strnlen_user(str, count, count); user_read_access_end(); return retval; -- cgit v1.2.3