diff options
Diffstat (limited to 'sys-libs/glibc/files/2.5/glibc-2.5-hardened-inittls-nosysenter.patch')
-rw-r--r-- | sys-libs/glibc/files/2.5/glibc-2.5-hardened-inittls-nosysenter.patch | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/sys-libs/glibc/files/2.5/glibc-2.5-hardened-inittls-nosysenter.patch b/sys-libs/glibc/files/2.5/glibc-2.5-hardened-inittls-nosysenter.patch new file mode 100644 index 0000000..420e6fd --- /dev/null +++ b/sys-libs/glibc/files/2.5/glibc-2.5-hardened-inittls-nosysenter.patch @@ -0,0 +1,283 @@ +When building glibc PIE (which is not something upstream support), +several modifications are necessary to the glibc build process. + +First, any syscalls in PIEs must be of the PIC variant, otherwise +textrels ensue. Then, any syscalls made before the initialisation +of the TLS will fail on i386, as the sysenter variant on i386 uses +the TLS, giving rise to a chicken-and-egg situation. This patch +defines a PIC syscall variant that doesn't use sysenter, even when the sysenter +version is normally used, and uses the non-sysenter version for the brk +syscall that is performed by the TLS initialisation. Further, the TLS +initialisation is moved in this case prior to the initialisation of +dl_osversion, as that requires further syscalls. + +csu/libc-start.c: Move initial TLS initialization to before the +initialisation of dl_osversion, when INTERNAL_SYSCALL_NOSYSENTER is defined + +csu/libc-tls.c: Use the no-sysenter version of sbrk when +INTERNAL_SYSCALL_NOSYSENTER is defined. + +misc/sbrk.c: Define a no-sysenter version of sbrk, using the no-sysenter +version of brk - if INTERNAL_SYSCALL_NOSYSENTER is defined. + +misc/brk.c: Define a no-sysenter version of brk if +INTERNAL_SYSCALL_NOSYSENTER is defined. + +sysdeps/unix/sysv/linux/i386/sysdep.h: Define INTERNAL_SYSCALL_NOSYSENTER +Make INTERNAL_SYSCALL always use the PIC variant, even if not SHARED. + +Patch by Kevin F. Quinn <kevquinn@gentoo.org> + +--- csu/libc-start.c.orig 2007-01-21 11:51:06.000000000 +0100 ++++ csu/libc-start.c 2007-01-21 11:55:57.000000000 +0100 +@@ -28,6 +28,7 @@ + extern int __libc_multiple_libcs; + + #include <tls.h> ++#include <sysdep.h> + #ifndef SHARED + # include <dl-osinfo.h> + extern void __pthread_initialize_minimal (void) +@@ -133,6 +134,14 @@ + # endif + _dl_aux_init (auxvec); + # endif ++# ifdef INTERNAL_SYSCALL_NOSYSENTER ++ /* Do the initial TLS initialization before _dl_osversion, ++ since the latter uses the uname syscall. */ ++# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP ++ if (__pthread_initialize_minimal) ++# endif ++ __pthread_initialize_minimal (); ++# endif + # ifdef DL_SYSDEP_OSCHECK + if (!__libc_multiple_libcs) + { +@@ -142,15 +151,17 @@ + } + # endif + ++# ifndef INTERNAL_SYSCALL_NOSYSENTER + /* Initialize the thread library at least a bit since the libgcc + functions are using thread functions if these are available and + we need to setup errno. If there is no thread library and we + handle TLS the function is defined in the libc to initialized the + TLS handling. */ +-# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP ++# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP + if (__pthread_initialize_minimal) +-# endif ++# endif + __pthread_initialize_minimal (); ++# endif + #endif + + # ifndef SHARED +--- csu/libc-tls.c.orig 2007-01-21 11:37:02.000000000 +0100 ++++ csu/libc-tls.c 2007-01-21 12:09:33.000000000 +0100 +@@ -23,6 +23,7 @@ + #include <unistd.h> + #include <stdio.h> + #include <sys/param.h> ++#include <sysdep.h> + + + #ifdef SHARED +@@ -30,6 +31,9 @@ + #endif + + #ifdef USE_TLS ++# ifdef INTERNAL_SYSCALL_NOSYSENTER ++extern void *__sbrk_nosysenter (intptr_t __delta); ++# endif + extern ElfW(Phdr) *_dl_phdr; + extern size_t _dl_phnum; + +@@ -142,14 +146,26 @@ + + The initialized value of _dl_tls_static_size is provided by dl-open.c + to request some surplus that permits dynamic loading of modules with +- IE-model TLS. */ ++ IE-model TLS. ++ ++ Where the normal sbrk would use a syscall that needs the TLS (i386) ++ use the special non-sysenter version instead. */ + # if TLS_TCB_AT_TP + tcb_offset = roundup (memsz + GL(dl_tls_static_size), tcbalign); ++# ifdef INTERNAL_SYSCALL_NOSYSENTER ++ tlsblock = __sbrk_nosysenter (tcb_offset + tcbsize + max_align); ++# else + tlsblock = __sbrk (tcb_offset + tcbsize + max_align); ++# endif + # elif TLS_DTV_AT_TP + tcb_offset = roundup (tcbsize, align ?: 1); ++# ifdef INTERNAL_SYSCALL_NOSYSENTER ++ tlsblock = __sbrk_nosysenter (tcb_offset + memsz + max_align ++ + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size)); ++# else + tlsblock = __sbrk (tcb_offset + memsz + max_align + + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size)); ++# endif + tlsblock += TLS_PRE_TCB_SIZE; + # else + /* In case a model with a different layout for the TCB and DTV +--- misc/sbrk.c.orig 2007-01-21 11:38:27.000000000 +0100 ++++ misc/sbrk.c 2007-01-21 12:07:29.000000000 +0100 +@@ -18,6 +18,7 @@ + + #include <unistd.h> + #include <errno.h> ++#include <sysdep.h> + + /* Defined in brk.c. */ + extern void *__curbrk; +@@ -29,6 +30,35 @@ + /* Extend the process's data space by INCREMENT. + If INCREMENT is negative, shrink data space by - INCREMENT. + Return start of new space allocated, or -1 for errors. */ ++#ifdef INTERNAL_SYSCALL_NOSYSENTER ++/* This version is used by csu/libc-tls.c whem initialising the TLS ++ if the SYSENTER version requires the TLS (which it does on i386). ++ Obviously using the TLS before it is initialised is broken. */ ++extern int __brk_nosysenter (void *addr); ++void * ++__sbrk_nosysenter (intptr_t increment) ++{ ++ void *oldbrk; ++ ++ /* If this is not part of the dynamic library or the library is used ++ via dynamic loading in a statically linked program update ++ __curbrk from the kernel's brk value. That way two separate ++ instances of __brk and __sbrk can share the heap, returning ++ interleaved pieces of it. */ ++ if (__curbrk == NULL || __libc_multiple_libcs) ++ if (__brk_nosysenter (0) < 0) /* Initialize the break. */ ++ return (void *) -1; ++ ++ if (increment == 0) ++ return __curbrk; ++ ++ oldbrk = __curbrk; ++ if (__brk_nosysenter (oldbrk + increment) < 0) ++ return (void *) -1; ++ ++ return oldbrk; ++} ++#endif + void * + __sbrk (intptr_t increment) + { +--- sysdeps/unix/sysv/linux/i386/brk.c.orig 2007-01-21 11:39:16.000000000 +0100 ++++ sysdeps/unix/sysv/linux/i386/brk.c 2007-01-21 11:44:01.000000000 +0100 +@@ -31,6 +31,30 @@ + linker. */ + weak_alias (__curbrk, ___brk_addr) + ++#ifdef INTERNAL_SYSCALL_NOSYSENTER ++/* This version is used by csu/libc-tls.c whem initialising the TLS ++ * if the SYSENTER version requires the TLS (which it does on i386). ++ * Obviously using the TLS before it is initialised is broken. */ ++int ++__brk_nosysenter (void *addr) ++{ ++ void *__unbounded newbrk; ++ ++ INTERNAL_SYSCALL_DECL (err); ++ newbrk = (void *__unbounded) INTERNAL_SYSCALL_NOSYSENTER (brk, err, 1, ++ __ptrvalue (addr)); ++ ++ __curbrk = newbrk; ++ ++ if (newbrk < addr) ++ { ++ __set_errno (ENOMEM); ++ return -1; ++ } ++ ++ return 0; ++} ++#endif + int + __brk (void *addr) + { +--- sysdeps/unix/sysv/linux/i386/sysdep.h.orig 2007-01-21 13:08:00.000000000 +0100 ++++ sysdeps/unix/sysv/linux/i386/sysdep.h 2007-01-21 13:19:10.000000000 +0100 +@@ -187,7 +187,7 @@ + /* The original calling convention for system calls on Linux/i386 is + to use int $0x80. */ + #ifdef I386_USE_SYSENTER +-# ifdef SHARED ++# if defined SHARED || defined __PIC__ + # define ENTER_KERNEL call *%gs:SYSINFO_OFFSET + # else + # define ENTER_KERNEL call *_dl_sysinfo +@@ -358,7 +358,7 @@ + possible to use more than four parameters. */ + #undef INTERNAL_SYSCALL + #ifdef I386_USE_SYSENTER +-# ifdef SHARED ++# if defined SHARED || defined __PIC__ + # define INTERNAL_SYSCALL(name, err, nr, args...) \ + ({ \ + register unsigned int resultvar; \ +@@ -384,6 +384,18 @@ + : "0" (name), "i" (offsetof (tcbhead_t, sysinfo)) \ + ASMFMT_##nr(args) : "memory", "cc"); \ + (int) resultvar; }) ++# define INTERNAL_SYSCALL_NOSYSENTER(name, err, nr, args...) \ ++ ({ \ ++ register unsigned int resultvar; \ ++ EXTRAVAR_##nr \ ++ asm volatile ( \ ++ LOADARGS_NOSYSENTER_##nr \ ++ "movl %1, %%eax\n\t" \ ++ "int $0x80\n\t" \ ++ RESTOREARGS_NOSYSENTER_##nr \ ++ : "=a" (resultvar) \ ++ : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \ ++ (int) resultvar; }) + # else + # define INTERNAL_SYSCALL(name, err, nr, args...) \ + ({ \ +@@ -447,12 +459,20 @@ + + #define LOADARGS_0 + #ifdef __PIC__ +-# if defined I386_USE_SYSENTER && defined SHARED ++# if defined I386_USE_SYSENTER && ( defined SHARED || defined __PIC__ ) + # define LOADARGS_1 \ + "bpushl .L__X'%k3, %k3\n\t" + # define LOADARGS_5 \ + "movl %%ebx, %4\n\t" \ + "movl %3, %%ebx\n\t" ++# define LOADARGS_NOSYSENTER_1 \ ++ "bpushl .L__X'%k2, %k2\n\t" ++# define LOADARGS_NOSYSENTER_2 LOADARGS_NOSYSENTER_1 ++# define LOADARGS_NOSYSENTER_3 LOADARGS_3 ++# define LOADARGS_NOSYSENTER_4 LOADARGS_3 ++# define LOADARGS_NOSYSENTER_5 \ ++ "movl %%ebx, %3\n\t" \ ++ "movl %2, %%ebx\n\t" + # else + # define LOADARGS_1 \ + "bpushl .L__X'%k2, %k2\n\t" +@@ -474,11 +495,18 @@ + + #define RESTOREARGS_0 + #ifdef __PIC__ +-# if defined I386_USE_SYSENTER && defined SHARED ++# if defined I386_USE_SYSENTER && ( defined SHARED || defined __PIC__ ) + # define RESTOREARGS_1 \ + "bpopl .L__X'%k3, %k3\n\t" + # define RESTOREARGS_5 \ + "movl %4, %%ebx" ++# define RESTOREARGS_NOSYSENTER_1 \ ++ "bpopl .L__X'%k2, %k2\n\t" ++# define RESTOREARGS_NOSYSENTER_2 RESTOREARGS_NOSYSENTER_1 ++# define RESTOREARGS_NOSYSENTER_3 RESTOREARGS_3 ++# define RESTOREARGS_NOSYSENTER_4 RESTOREARGS_3 ++# define RESTOREARGS_NOSYSENTER_5 \ ++ "movl %3, %%ebx" + # else + # define RESTOREARGS_1 \ + "bpopl .L__X'%k2, %k2\n\t" |