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From: "nszabolcs at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/19129] New: [arm] Concurrent lazy TLSDESC resolution can crash
Date: Wed, 14 Oct 2015 13:49:00 -0000 [thread overview]
Message-ID: <bug-19129-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=19129
Bug ID: 19129
Summary: [arm] Concurrent lazy TLSDESC resolution can crash
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: nszabolcs at gmail dot com
Target Milestone: ---
_dl_tlsdesc_resolve_hold can crash because it does not save/restore r0
(tlsdesc pointer) which gets clobbered.
happens with lazy binding (default), tlsdesc (-mtls-dialect=gnu2) and
concurrent first access to the same tls object:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 _dl_tlsdesc_resolve_hold () at ../sysdeps/arm/dl-tlsdesc.S:214
214 sfi_breg r0, \
[Current thread is 1 (Thread 0xf72cca00 (LWP 9307))]
(gdb) disas
Dump of assembler code for function _dl_tlsdesc_resolve_hold:
0xf7479630 <+0>: push {r2, r3, r12, lr}
0xf7479634 <+4>: sub r1, pc, #12
0xf7479638 <+8>: bl 0xf74794fc <_dl_tlsdesc_resolve_hold_fixup>
0xf747963c <+12>: pop {r2, r3, r12, lr}
=> 0xf7479640 <+16>: ldr r1, [r0, #4]
0xf7479644 <+20>: bx r1
End of assembler dump.
(gdb) i reg
r0 0x0 0
r1 0x0 0
r2 0xf745fc74 4148558964
r3 0x7 7
r4 0xf72cca00 4146907648
r5 0xffbb3c18 4290460696
r6 0x0 0
r7 0x152 338
r8 0xffbb3c18 4290460696
r9 0xf748d4c0 4148745408
r10 0x0 0
r11 0xf72cc53c 4146906428
r12 0xf7441fa4 4148436900
sp 0xf72cc3fc 0xf72cc3fc
lr 0xf7441fb8 -146530376
pc 0xf7479640 0xf7479640 <_dl_tlsdesc_resolve_hold+16>
cpsr 0x60080010 1611137040
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next reply other threads:[~2015-10-14 13:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-14 13:49 nszabolcs at gmail dot com [this message]
2015-10-14 16:02 ` [Bug dynamic-link/19129] " cvs-commit at gcc dot gnu.org
2015-10-14 16:08 ` nszabolcs at gmail dot com
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