Thread (3 messages) 3 messages, 3 authors, 2025-11-21

Re: [PATCH] powerpc/addnote: Fix overflow on 32-bit builds

From: Christophe Leroy <hidden>
Date: 2025-10-09 14:20:39
Also in: lkml


Le 22/04/2025 à 04:31, Ben Collins a écrit :
The PUT_64[LB]E() macros need to cast the value to unsigned long long
like the GET_64[LB]E() macros. Caused lots of warnings when compiled
on 32-bit, and clobbered addresses (36-bit P4080).

Signed-off-by: Ben Collins <bcollins@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Reviewed-by: Christophe Leroy <redacted>
quoted hunk ↗ jump to hunk
---
  arch/powerpc/boot/addnote.c | 7 ++++---
  1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index 53b3b2621457d..78704927453aa 100644
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -68,8 +68,8 @@ static int e_class = ELFCLASS32;
  #define PUT_16BE(off, v)(buf[off] = ((v) >> 8) & 0xff, \
  			 buf[(off) + 1] = (v) & 0xff)
  #define PUT_32BE(off, v)(PUT_16BE((off), (v) >> 16L), PUT_16BE((off) + 2, (v)))
-#define PUT_64BE(off, v)((PUT_32BE((off), (v) >> 32L), \
-			  PUT_32BE((off) + 4, (v))))
+#define PUT_64BE(off, v)((PUT_32BE((off), (unsigned long long)(v) >> 32L), \
+			  PUT_32BE((off) + 4, (unsigned long long)(v))))
  
  #define GET_16LE(off)	((buf[off]) + (buf[(off)+1] << 8))
  #define GET_32LE(off)	(GET_16LE(off) + (GET_16LE((off)+2U) << 16U))
@@ -78,7 +78,8 @@ static int e_class = ELFCLASS32;
  #define PUT_16LE(off, v) (buf[off] = (v) & 0xff, \
  			  buf[(off) + 1] = ((v) >> 8) & 0xff)
  #define PUT_32LE(off, v) (PUT_16LE((off), (v)), PUT_16LE((off) + 2, (v) >> 16L))
-#define PUT_64LE(off, v) (PUT_32LE((off), (v)), PUT_32LE((off) + 4, (v) >> 32L))
+#define PUT_64LE(off, v) (PUT_32LE((off), (unsigned long long)(v)), \
+			  PUT_32LE((off) + 4, (unsigned long long)(v) >> 32L))
  
  #define GET_16(off)	(e_data == ELFDATA2MSB ? GET_16BE(off) : GET_16LE(off))
  #define GET_32(off)	(e_data == ELFDATA2MSB ? GET_32BE(off) : GET_32LE(off))
  
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help