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Subject[PATCH 4.9 009/104] MIPS: Ensure bss section ends on a long-aligned address
4.9-stable review patch.  If anyone has any objections, please let me know.


From: Paul Burton <>

[ Upstream commit 3f00f4d8f083bc61005d0a1ef592b149f5c88bbd ]

When clearing the .bss section in kernel_entry we do so using LONG_S
instructions, and branch whilst the current write address doesn't equal
the end of the .bss section minus the size of a long integer. The .bss
section always begins at a long-aligned address and we always increment
the write pointer by the size of a long integer - we therefore rely upon
the .bss section ending at a long-aligned address. If this is not the
case then the long-aligned write address can never be equal to the
non-long-aligned end address & we will continue to increment past the
end of the .bss section, attempting to zero the rest of memory.

Despite this requirement that .bss end at a long-aligned address we pass
0 as the end alignment requirement to the BSS_SECTION macro and thus
don't guarantee any particular alignment, allowing us to hit the error
condition described above.

Fix this by instead passing 8 bytes as the end alignment argument to
the BSS_SECTION macro, ensuring that the end of the .bss section is
always at least long-aligned.

Signed-off-by: Paul Burton <>
Signed-off-by: Ralf Baechle <>
Signed-off-by: Sasha Levin <>
Signed-off-by: Greg Kroah-Hartman <>
arch/mips/kernel/ | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/kernel/
+++ b/arch/mips/kernel/
@@ -182,7 +182,7 @@ SECTIONS
* Force .bss to 64K alignment so that .bss..swapper_pg_dir
* gets that alignment. .sbss should be empty, so there will be
* no holes after __init_end. */
- BSS_SECTION(0, 0x10000, 0)
+ BSS_SECTION(0, 0x10000, 8)

_end = . ;

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