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| author | Aurelien Jarno <aurelien@aurel32.net> | 2016-03-09 00:25:00 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2016-03-09 18:51:50 +0100 |
| commit | 63ed4db4b45cab21cf6f68aac7b9fce2f770fe74 (patch) | |
| tree | e0a6f2c5fb3181e46dd445ad685a34c5f3758019 | |
| parent | 9d1399e89d431b34a5a6e5e48ee40721c22815b8 (diff) | |
| download | glibc-63ed4db4b45cab21cf6f68aac7b9fce2f770fe74.tar glibc-63ed4db4b45cab21cf6f68aac7b9fce2f770fe74.tar.gz glibc-63ed4db4b45cab21cf6f68aac7b9fce2f770fe74.tar.bz2 glibc-63ed4db4b45cab21cf6f68aac7b9fce2f770fe74.zip | |
mips: terminate the FDE before the return trampoline in makecontext
In makecontext the FDE needs to be terminated before the return
trampoline otherwise backtrace called within a context created by
makecontext yields infinite backtrace.
This bug has been present for a long time, stdlib/tst-makecontext did
not fail until recent commit e535ce25. Tested on mips-linux-gnu and
mips64el-linux-gnuabi64 and mips-linux-gnu, no regression.
This fixes stdlib/tst-makecontext on MIPS.
Changelog:
[BZ #19792]
* sysdeps/unix/sysv/linux/mips/makecontext.S (__makecontext):
Terminate FDE before return label.
(cherry picked from commit f8e9c4d30c28b8815e65a391416e8b15d2e7cbb8)
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | NEWS | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/makecontext.S | 7 |
3 files changed, 14 insertions, 0 deletions
@@ -1,3 +1,9 @@ +2016-03-09 Aurelien Jarno <aurelien@aurel32.net> + + [BZ #19792] + * sysdeps/unix/sysv/linux/mips/makecontext.S (__makecontext): + Terminate FDE before return label. + 2016-03-08 Aurelien Jarno <aurelien@aurel32.net> * include/sys/auxv.h: New file. @@ -14,6 +14,7 @@ Security related changes: The following bugs are resolved with this release: [19679] gcc-4.9.3 C++ exception handling broken due to unaligned stack + [19792] MIPS: backtrace yields infinite backtrace with makecontext Version 2.23 diff --git a/sysdeps/unix/sysv/linux/mips/makecontext.S b/sysdeps/unix/sysv/linux/mips/makecontext.S index 66600c7513..31965543f8 100644 --- a/sysdeps/unix/sysv/linux/mips/makecontext.S +++ b/sysdeps/unix/sysv/linux/mips/makecontext.S @@ -153,6 +153,11 @@ NESTED (__makecontext, FRAMESZ, ra) #endif jr ra + /* We need to terminate the FDE to stop unwinding if backtrace was + called within a context created by makecontext. */ + cfi_endproc + nop + 99: #ifdef __PIC__ move gp, s1 @@ -186,6 +191,8 @@ NESTED (__makecontext, FRAMESZ, ra) 1: lb zero, (zero) b 1b + + cfi_startproc PSEUDO_END (__makecontext) weak_alias (__makecontext, makecontext) |