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-rw-r--r--gnu/packages/base.scm20
-rw-r--r--gnu/packages/commencement.scm10
-rw-r--r--gnu/packages/patches/glibc-memchr-overflow-i686.patch74
3 files changed, 102 insertions, 2 deletions
diff --git a/gnu/packages/base.scm b/gnu/packages/base.scm
index 9fcca45a54..6dc9e97c34 100644
--- a/gnu/packages/base.scm
+++ b/gnu/packages/base.scm
@@ -666,6 +666,16 @@ store.")
;; 4.7.1.
((" -lgcc_s") ""))
+ ;; Apply patch only on i686.
+ ;; TODO: Move the patch to 'patches' in the next update cycle.
+ ,@(if (string-prefix? "i686" (or (%current-target-system)
+ (%current-system)))
+ `(zero? (system* "patch" "-p1" "--force"
+ "--input"
+ (assoc-ref native-inputs
+ "glibc-memchr-overflow-i686.patch")))
+ '())
+
;; Have `system' use that Bash.
(substitute* "sysdeps/posix/system.c"
(("#define[[:blank:]]+SHELL_PATH.*$")
@@ -709,7 +719,15 @@ store.")
;; install the message catalogs, with 'msgfmt'.
(native-inputs `(("texinfo" ,texinfo)
("perl" ,perl)
- ("gettext" ,gettext-minimal)))
+ ("gettext" ,gettext-minimal)
+
+ ;; Apply this patch only on i686 to avoid a full rebuild.
+ ;; TODO: Move to 'patches' in the next update cycle.
+ ,@(if (string-prefix? "i686" (or (%current-target-system)
+ (%current-system)))
+ `(("glibc-memchr-overflow-i686.patch"
+ ,(search-patch "glibc-memchr-overflow-i686.patch")))
+ '())))
(native-search-paths
;; Search path for packages that provide locale data. This is useful
diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 92f6e6c2ea..4fa34c93b1 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -22,6 +22,7 @@
(define-module (gnu packages commencement)
#:use-module ((guix licenses)
#:select (gpl3+ lgpl2.0+ public-domain))
+ #:use-module (gnu packages)
#:use-module (gnu packages bootstrap)
#:use-module (gnu packages base)
#:use-module (gnu packages bash)
@@ -509,7 +510,14 @@ the bootstrap environment."
(propagated-inputs `(("kernel-headers" ,(kernel-headers-boot0))))
(native-inputs
`(("texinfo" ,texinfo-boot0)
- ("perl" ,perl-boot0)))
+ ("perl" ,perl-boot0)
+ ;; Apply this patch only on i686 to avoid a full rebuild.
+ ;; TODO: Remove in the next update cycle.
+ ,@(if (string-prefix? "i686" (or (%current-target-system)
+ (%current-system)))
+ `(("glibc-memchr-overflow-i686.patch"
+ ,(search-patch "glibc-memchr-overflow-i686.patch")))
+ '())))
(inputs
`(;; The boot inputs. That includes the bootstrap libc. We don't want
;; it in $CPATH, hence the 'pre-configure' phase above.
diff --git a/gnu/packages/patches/glibc-memchr-overflow-i686.patch b/gnu/packages/patches/glibc-memchr-overflow-i686.patch
new file mode 100644
index 0000000000..0b1b5b9f96
--- /dev/null
+++ b/gnu/packages/patches/glibc-memchr-overflow-i686.patch
@@ -0,0 +1,74 @@
+Extracted from glibc upstream git repository. Changes to the ChangeLog have
+been removed. This patch is needed to fix spurious segmentation faults on
+i686.
+
+From 3abeeec5f46ff036bd9df60bb096e20314ccd078 Mon Sep 17 00:00:00 2001
+From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
+Date: Tue, 14 Mar 2017 14:16:13 -0300
+Subject: [PATCH] Fix i686 memchr overflow calculation (BZ#21182)
+
+This patch fixes the regression added by 23d2770 for final address
+overflow calculation. The subtraction of the considered size (16)
+at line 120 is at wrong place, for sizes less than 16 subsequent
+overflow check will not take in consideration an invalid size (since
+the subtraction will be negative). Also, the lea instruction also
+does not raise the carry flag (CF) that is used in subsequent jbe
+to check for overflow.
+
+The fix is to follow x86_64 logic from 3daef2c where the overflow
+is first check and a sub instruction is issued. In case of resulting
+negative size, CF will be set by the sub instruction and a NULL
+result will be returned. The patch also add similar tests reported
+in bug report.
+
+Checked on i686-linux-gnu and x86_64-linux-gnu.
+
+ * string/test-memchr.c (do_test): Add BZ#21182 checks for address
+ near end of a page.
+ * sysdeps/i386/i686/multiarch/memchr-sse2.S (__memchr): Fix
+ overflow calculation.
+---
+ string/test-memchr.c | 6 ++++++
+ sysdeps/i386/i686/multiarch/memchr-sse2.S | 2 +-
+ 3 files changed, 15 insertions(+), 1 deletion(-)
+
+diff --git a/string/test-memchr.c b/string/test-memchr.c
+index 2403c9242b..669e092e7d 100644
+--- a/string/test-memchr.c
++++ b/string/test-memchr.c
+@@ -210,6 +210,12 @@ test_main (void)
+ do_test (0, i, i + 1, i + 1, 0);
+ }
+
++ /* BZ#21182 - wrong overflow calculation for i686 implementation
++ with address near end of the page. */
++ for (i = 2; i < 16; ++i)
++ /* page_size is in fact getpagesize() * 2. */
++ do_test (page_size / 2 - i, i, i, 1, 0x9B);
++
+ do_random_tests ();
+ return ret;
+ }
+diff --git a/sysdeps/i386/i686/multiarch/memchr-sse2.S b/sysdeps/i386/i686/multiarch/memchr-sse2.S
+index 910679cfc0..e41f324a77 100644
+--- a/sysdeps/i386/i686/multiarch/memchr-sse2.S
++++ b/sysdeps/i386/i686/multiarch/memchr-sse2.S
+@@ -117,7 +117,6 @@ L(crosscache):
+
+ # ifndef USE_AS_RAWMEMCHR
+ jnz L(match_case2_prolog1)
+- lea -16(%edx), %edx
+ /* Calculate the last acceptable address and check for possible
+ addition overflow by using satured math:
+ edx = ecx + edx
+@@ -125,6 +124,7 @@ L(crosscache):
+ add %ecx, %edx
+ sbb %eax, %eax
+ or %eax, %edx
++ sub $16, %edx
+ jbe L(return_null)
+ lea 16(%edi), %edi
+ # else
+--
+2.12.2
+