diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 3adced971..a37842d0a 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -3418,6 +3418,29 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <valid>0:2</valid>
     </arg>
   </function>
+  <!-- https://man7.org/linux/man-pages/man3/lseek64.3.html -->
+  <!-- loff_t llseek(int fd, loff_t offset, int whence); -->
+  <function name="llseek">
+    <returnValue type="loff_t"/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <not-bool/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-uninit/>
+      <not-bool/>
+      <valid>0:2</valid>
+    </arg>
+    <!-- Note: Since glibc 2.28, this function symbol is no longer available to newly linked applications. -->
+    <warn severity="style" reason="Obsolescent" alternatives="lseek64"/>
+  </function>
   <!-- int nanosleep(const struct timespec *rqtp, struct timespec *rmtp); -->
   <function name="nanosleep">
     <returnValue type="int"/>
@@ -5429,6 +5452,8 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <podtype name="id_t" sign="s"/>
   <podtype name="blkcnt_t" sign="s"/>
   <podtype name="off_t" sign="s"/>
+  <podtype name="loff_t" sign="s" size="8"/>
+  <podtype name="off64_t" sign="s" size="8"/>
   <podtype name="fsblkcnt_t" sign="u"/>
   <podtype name="fsfilcnt_t" sign="u"/>
   <podtype name="ino_t" sign="u"/>
diff --git a/test/cfg/posix.c b/test/cfg/posix.c
index eb7919bbe..a19d0186e 100644
--- a/test/cfg/posix.c
+++ b/test/cfg/posix.c
@@ -29,6 +29,36 @@
 #include <wchar.h>
 #include <string.h>
 
+// Note: Since glibc 2.28, this function symbol is no longer available to newly linked applications.
+void invalidFunctionArg_llseek(int fd, loff_t offset, int origin)
+{
+    // cppcheck-suppress llseekCalled
+    // cppcheck-suppress invalidFunctionArg
+    (void)llseek(-1, offset, SEEK_SET);
+    // cppcheck-suppress llseekCalled
+    // cppcheck-suppress invalidFunctionArg
+    (void)llseek(fd, offset, -1);
+    // cppcheck-suppress llseekCalled
+    // cppcheck-suppress invalidFunctionArg
+    (void)llseek(fd, offset, 3);
+    // cppcheck-suppress llseekCalled
+    // cppcheck-suppress invalidFunctionArg
+    (void)llseek(fd, offset, 42+SEEK_SET);
+    // cppcheck-suppress llseekCalled
+    // cppcheck-suppress invalidFunctionArg
+    (void)llseek(fd, offset, SEEK_SET+42);
+    // No invalidFunctionArg warning is expected for
+    // cppcheck-suppress llseekCalled
+    (void)llseek(0, offset, origin);
+    // cppcheck-suppress llseekCalled
+    (void)llseek(fd, offset, origin);
+    // cppcheck-suppress llseekCalled
+    (void)llseek(fd, offset, SEEK_SET);
+    // cppcheck-suppress llseekCalled
+    (void)llseek(fd, offset, SEEK_CUR);
+    // cppcheck-suppress llseekCalled
+    (void)llseek(fd, offset, SEEK_END);
+}
 
 void invalidFunctionArg_lseek64(int fd, off_t offset, int origin)
 {