diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2025-11-17 17:43:44 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-11-18 15:27:35 +0100 |
| commit | 4322c8f81c58da493a3c46eda32f0e7534a350a0 (patch) | |
| tree | c749cc4664c4e9f972f4452955d52cd6f35aef98 | |
| parent | 1c204914bc4401623a1b242305c583060a0b7e4f (diff) | |
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 <christophe.leroy@csgroup.eu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://patch.msgid.link/cb5e4b0fa49ea9c740570949d5e3544423389757.1763396724.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | lib/strncpy_from_user.c | 2 | ||||
| -rw-r--r-- | lib/strnlen_user.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c index 6dc234913dd5..5bb752ff7c61 100644 --- a/lib/strncpy_from_user.c +++ b/lib/strncpy_from_user.c @@ -126,7 +126,7 @@ long strncpy_from_user(char *dst, const char __user *src, long count) if (can_do_masked_user_access()) { long retval; - src = masked_user_access_begin(src); + src = masked_user_read_access_begin(src); retval = do_strncpy_from_user(dst, src, count, count); user_read_access_end(); return retval; 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; |