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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-10-15 13:49:59 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-19 00:56:17 +1100 |
| commit | 2c51d97ee88da897db8405f659d1735ffe86ad7c (patch) | |
| tree | fd8503757d401435b6c6b6c182091129b477123e | |
| parent | 5f69e38885c3483a1838dd946aaf0166b727ecbd (diff) | |
| download | linux-2c51d97ee88da897db8405f659d1735ffe86ad7c.tar.bz2 | |
powerpc: Check prom_init for disallowed sections
prom_init.c must not modify the kernel image outside
of the .bss.prominit section. Thus make sure that
prom_init.o doesn't have anything in any of these:
.data
.bss
.init.data
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/kernel/prom_init_check.sh | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh index acb6b9226352..667df97d2595 100644 --- a/arch/powerpc/kernel/prom_init_check.sh +++ b/arch/powerpc/kernel/prom_init_check.sh @@ -28,6 +28,18 @@ OBJ="$2" ERROR=0 +function check_section() +{ + file=$1 + section=$2 + size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}") + size=${size:-0} + if [ $size -ne 0 ]; then + ERROR=1 + echo "Error: Section $section not empty in prom_init.c" >&2 + fi +} + for UNDEF in $($NM -u $OBJ | awk '{print $2}') do # On 64-bit nm gives us the function descriptors, which have @@ -66,4 +78,8 @@ do fi done +check_section $OBJ .data +check_section $OBJ .bss +check_section $OBJ .init.data + exit $ERROR |