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| author | kan <kan@FreeBSD.org> | 2009-07-14 21:19:13 +0000 |
|---|---|---|
| committer | kan <kan@FreeBSD.org> | 2009-07-14 21:19:13 +0000 |
| commit | ef443476d9706035ac219f0280ef0b817dda7a6d (patch) | |
| tree | 50c2540e7067c9b377ade1910cd0348aeab454e7 /lib | |
| parent | d81f73fcb520cff58dcafda0e644b91837b26a40 (diff) | |
| download | FreeBSD-src-ef443476d9706035ac219f0280ef0b817dda7a6d.zip FreeBSD-src-ef443476d9706035ac219f0280ef0b817dda7a6d.tar.gz | |
Second attempt at eliminating .text relocations in shared libraries
compiled with stack protector.
Use libssp_nonshared library to pull __stack_chk_fail_local symbol into
each library that needs it instead of pulling it from libc. GCC
generates local calls to this function which result in absolute
relocations put into position-independent code segment, making dynamic
loader do extra work every time given shared library is being relocated
and making affected text pages non-shareable.
Reviewed by: kib
Approved by: re (kib)
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/Makefile | 2 | ||||
| -rw-r--r-- | lib/libc/sys/Symbol.map | 1 | ||||
| -rw-r--r-- | lib/libc/sys/stack_protector.c | 7 |
3 files changed, 2 insertions, 8 deletions
diff --git a/lib/libc/Makefile b/lib/libc/Makefile index cf9ef3a..4f13f8e 100644 --- a/lib/libc/Makefile +++ b/lib/libc/Makefile @@ -26,7 +26,7 @@ PRECIOUSLIB= # DPADD+= ${LIBGCC} LDFLAGS+= -nodefaultlibs -LDADD+= -lgcc +LDADD+= -lgcc -lssp_nonshared # Define (empty) variables so that make doesn't give substitution # errors if the included makefiles don't change these: diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map index 901b261..56d8aaa 100644 --- a/lib/libc/sys/Symbol.map +++ b/lib/libc/sys/Symbol.map @@ -282,7 +282,6 @@ FBSD_1.0 { socket; socketpair; __stack_chk_fail; - __stack_chk_fail_local; __stack_chk_guard; stat; statfs; diff --git a/lib/libc/sys/stack_protector.c b/lib/libc/sys/stack_protector.c index f753fcd..63beebc 100644 --- a/lib/libc/sys/stack_protector.c +++ b/lib/libc/sys/stack_protector.c @@ -47,7 +47,6 @@ static void __guard_setup(void) __attribute__((__constructor__, __used__)); static void __fail(const char *); void __stack_chk_fail(void); void __chk_fail(void); -void __stack_chk_fail_local(void); /*LINTED used*/ static void @@ -109,8 +108,4 @@ __chk_fail(void) __fail("buffer overflow detected; terminated"); } -void -__stack_chk_fail_local(void) -{ - __stack_chk_fail(); -} +__sym_compat(__stack_chk_fail_local, __stack_chk_fail, FBSD_1.0); |
