diff options
Diffstat (limited to 'x86-64-Fix-the-dtv-field-load-for-x32-BZ-31184.patch')
| -rw-r--r-- | x86-64-Fix-the-dtv-field-load-for-x32-BZ-31184.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/x86-64-Fix-the-dtv-field-load-for-x32-BZ-31184.patch b/x86-64-Fix-the-dtv-field-load-for-x32-BZ-31184.patch new file mode 100644 index 0000000..c55bdf9 --- /dev/null +++ b/x86-64-Fix-the-dtv-field-load-for-x32-BZ-31184.patch @@ -0,0 +1,68 @@ +From 35ea7549751d4f13a28c732e6ad68204f5e60a06 Mon Sep 17 00:00:00 2001 +From: "H.J. Lu" <hjl.tools@gmail.com> +Date: Wed, 20 Dec 2023 16:31:43 -0800 +Subject: [PATCH 4/9] x86-64: Fix the dtv field load for x32 [BZ #31184] + +On x32, I got + +FAIL: elf/tst-tlsgap + +$ gdb elf/tst-tlsgap +... +open tst-tlsgap-mod1.so + +Thread 2 "tst-tlsgap" received signal SIGSEGV, Segmentation fault. +[Switching to LWP 2268754] +_dl_tlsdesc_dynamic () at ../sysdeps/x86_64/dl-tlsdesc.S:108 +108 movq (%rsi), %rax +(gdb) p/x $rsi +$4 = 0xf7dbf9005655fb18 +(gdb) + +This is caused by + +_dl_tlsdesc_dynamic: + _CET_ENDBR + /* Preserve call-clobbered registers that we modify. + We need two scratch regs anyway. */ + movq %rsi, -16(%rsp) + movq %fs:DTV_OFFSET, %rsi + +Since the dtv field in TCB is a pointer, %fs:DTV_OFFSET is a 32-bit +location, not 64-bit. Load the dtv field to RSI_LP instead of rsi. +This fixes BZ #31184. + +(cherry picked from commit 3502440397bbb840e2f7223734aa5cc2cc0e29b6) +--- + NEWS | 1 + + sysdeps/x86_64/dl-tlsdesc.S | 2 +- + 2 files changed, 2 insertions(+), 1 deletion(-) + +diff --git a/NEWS b/NEWS +index 5ac488bf9b..71057e4793 100644 +--- a/NEWS ++++ b/NEWS +@@ -37,6 +37,7 @@ The following bugs are resolved with this release: + [30804] F_GETLK, F_SETLK, and F_SETLKW value change for powerpc64 with + -D_FILE_OFFSET_BITS=64 + [30842] Stack read overflow in getaddrinfo in no-aaaa mode (CVE-2023-4527) ++ [31184] FAIL: elf/tst-tlsgap + + + Version 2.38 +diff --git a/sysdeps/x86_64/dl-tlsdesc.S b/sysdeps/x86_64/dl-tlsdesc.S +index 5593897e29..c4823547d7 100644 +--- a/sysdeps/x86_64/dl-tlsdesc.S ++++ b/sysdeps/x86_64/dl-tlsdesc.S +@@ -102,7 +102,7 @@ _dl_tlsdesc_dynamic: + /* Preserve call-clobbered registers that we modify. + We need two scratch regs anyway. */ + movq %rsi, -16(%rsp) +- movq %fs:DTV_OFFSET, %rsi ++ mov %fs:DTV_OFFSET, %RSI_LP + movq %rdi, -8(%rsp) + movq TLSDESC_ARG(%rax), %rdi + movq (%rsi), %rax +-- +2.33.0 + |