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author | H.J. Lu <hjl.tools@gmail.com> | 2023-12-20 16:31:43 -0800 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2023-12-23 06:06:26 -0800 |
commit | 35ea7549751d4f13a28c732e6ad68204f5e60a06 (patch) | |
tree | fab4949912a03fe266838461def7e49191984675 | |
parent | 0de9082ed8d8f149ca87d569a73692046e236c18 (diff) | |
download | glibc-35ea7549751d4f13a28c732e6ad68204f5e60a06.tar.gz glibc-35ea7549751d4f13a28c732e6ad68204f5e60a06.tar.xz glibc-35ea7549751d4f13a28c732e6ad68204f5e60a06.zip |
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)
-rw-r--r-- | NEWS | 1 | ||||
-rw-r--r-- | sysdeps/x86_64/dl-tlsdesc.S | 2 |
2 files changed, 2 insertions, 1 deletions
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 |