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[XEN PATCH] xen: fix unspecified behavior in tr invocation
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- Date: Thu, 26 Jun 2025 16:59:57 +0200
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 26 Jun 2025 15:00:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
The result of the command is undefined according to the specification if
the "string2" argument in tr is shorter than "string1". GNU tr behaves
correctly by extending "string2" to repeat the last character.
Fixes: eb61a4fb14d2 ("xen: fix header guard generation for asm-generic headers")
Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
---
xen/scripts/Makefile.asm-generic | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/scripts/Makefile.asm-generic b/xen/scripts/Makefile.asm-generic
index f6850758c54b..4e628e116adf 100644
--- a/xen/scripts/Makefile.asm-generic
+++ b/xen/scripts/Makefile.asm-generic
@@ -34,7 +34,7 @@ unwanted := $(filter-out $(generic-y)
$(generated-y),$(old-headers))
quiet_cmd_wrap = WRAP $@
cmd_wrap = \
arch=$$(echo $@ | sed -n 's:.*arch/\([^/]*\)/.*:\1:p' | tr a-z A-Z); \
- upper=$$(echo $*.h | tr a-z A-Z | tr '/.-' '__'); \
+ upper=$$(echo $*.h | tr a-z A-Z | tr '/.-' '___'); \
echo "\#ifndef $${arch}_GENERIC_$${upper}" > $@.new; \
echo "\#define $${arch}_GENERIC_$${upper}" >> $@.new; \
echo "\#include <asm-generic/$*.h>" >> $@.new; \
--
2.43.0
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