6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
[ Upstream commit 01e346ffefda3a7088afebf02b940614179688e7 ]
rtas_token_to_function() WARNs when passed an invalid token; it's
meant to catch bugs in kernel-based users of RTAS functions. However,
user space controls the token value passed to rtas_token_to_function()
by block_rtas_call(), so user space with sufficient privilege to use
sys_rtas() can trigger the warnings at will:
unexpected failed lookup for token 2048
WARNING: CPU: 20 PID: 2247 at arch/powerpc/kernel/rtas.c:556
rtas_token_to_function+0xfc/0x110
...
NIP rtas_token_to_function+0xfc/0x110
LR rtas_token_to_function+0xf8/0x110
Call Trace:
rtas_token_to_function+0xf8/0x110 (unreliable)
sys_rtas+0x188/0x880
system_call_exception+0x268/0x530
system_call_common+0x160/0x2c4
It's desirable to continue warning on bogus tokens in
rtas_token_to_function(). Currently it is used to look up RTAS
function descriptors when tracing, where we know there has to have
been a successful descriptor lookup by different means already, and it
would be a serious inconsistency for the reverse lookup to fail.
So instead of weakening rtas_token_to_function()'s contract by
removing the warnings, introduce rtas_token_to_function_untrusted(),
which has no opinion on failed lookups. Convert block_rtas_call() and
rtas_token_to_function() to use it.
Fixes: 8252b88294d2 ("powerpc/rtas: improve function information lookups")
Signed-off-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-1-e9eafd0c8c6c@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/powerpc/kernel/rtas.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index eddc031c4b95..87d65bdd3eca 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -544,6 +544,21 @@ static int __init rtas_token_to_function_xarray_init(void)
}
arch_initcall(rtas_token_to_function_xarray_init);
+/*
+ * For use by sys_rtas(), where the token value is provided by user
+ * space and we don't want to warn on failed lookups.
+ */
+static const struct rtas_function *rtas_token_to_function_untrusted(s32 token)
+{
+ return xa_load(&rtas_token_to_function_xarray, token);
+}
+
+/*
+ * Reverse lookup for deriving the function descriptor from a
+ * known-good token value in contexts where the former is not already
+ * available. @token must be valid, e.g. derived from the result of a
+ * prior lookup against the function table.
+ */
static const struct rtas_function *rtas_token_to_function(s32 token)
{
const struct rtas_function *func;
@@ -551,7 +566,7 @@ static const struct rtas_function *rtas_token_to_function(s32 token)
if (WARN_ONCE(token < 0, "invalid token %d", token))
return NULL;
- func = xa_load(&rtas_token_to_function_xarray, token);
+ func = rtas_token_to_function_untrusted(token);
if (WARN_ONCE(!func, "unexpected failed lookup for token %d", token))
return NULL;
@@ -1726,7 +1741,7 @@ static bool block_rtas_call(int token, int nargs,
* If this token doesn't correspond to a function the kernel
* understands, you're not allowed to call it.
*/
- func = rtas_token_to_function(token);
+ func = rtas_token_to_function_untrusted(token);
if (!func)
goto err;
/*
--
2.43.0
