6.6-stable review patch. If anyone has any objections, please let me know.
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From: Petr Pavlu petr.pavlu@suse.com
[ Upstream commit a6323bd4e611567913e23df5b58f2d4e4da06789 ]
Passing a module name longer than MODULE_NAME_LEN to the delete_module syscall results in its silent truncation. This really isn't much of a problem in practice, but it could theoretically lead to the removal of an incorrect module. It is more sensible to return ENAMETOOLONG or ENOENT in such a case.
Update the syscall to return ENOENT, as documented in the delete_module(2) man page to mean "No module by that name exists." This is appropriate because a module with a name longer than MODULE_NAME_LEN cannot be loaded in the first place.
Signed-off-by: Petr Pavlu petr.pavlu@suse.com Reviewed-by: Daniel Gomez da.gomez@samsung.com Link: https://lore.kernel.org/r/20250630143535.267745-2-petr.pavlu@suse.com Signed-off-by: Daniel Gomez da.gomez@samsung.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/module/main.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/module/main.c b/kernel/module/main.c index 9711ad14825b..627680e568fc 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -701,14 +701,16 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user, struct module *mod; char name[MODULE_NAME_LEN]; char buf[MODULE_FLAGS_BUF_SIZE]; - int ret, forced = 0; + int ret, len, forced = 0;
if (!capable(CAP_SYS_MODULE) || modules_disabled) return -EPERM;
- if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) - return -EFAULT; - name[MODULE_NAME_LEN-1] = '\0'; + len = strncpy_from_user(name, name_user, MODULE_NAME_LEN); + if (len == 0 || len == MODULE_NAME_LEN) + return -ENOENT; + if (len < 0) + return len;
audit_log_kern_module(name);