diff options
Diffstat (limited to 'sys-libs/glibc/files/2.6/glibc-2.6-hardened-inittls-nosysenter.patch')
| -rw-r--r-- | sys-libs/glibc/files/2.6/glibc-2.6-hardened-inittls-nosysenter.patch | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/sys-libs/glibc/files/2.6/glibc-2.6-hardened-inittls-nosysenter.patch b/sys-libs/glibc/files/2.6/glibc-2.6-hardened-inittls-nosysenter.patch deleted file mode 100644 index be8ca19..0000000 --- a/sys-libs/glibc/files/2.6/glibc-2.6-hardened-inittls-nosysenter.patch +++ /dev/null @@ -1,273 +0,0 @@ -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 -+++ csu/libc-start.c -@@ -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); -@@ -129,6 +130,11 @@ - # 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. */ -+ __pthread_initialize_minimal (); -+# endif - # ifdef DL_SYSDEP_OSCHECK - if (!__libc_multiple_libcs) - { -@@ -138,10 +144,12 @@ - } - # 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. */ - __pthread_initialize_minimal (); -+# endif - #endif - - # ifndef SHARED ---- csu/libc-tls.c -+++ csu/libc-tls.c -@@ -23,6 +23,7 @@ - #include <unistd.h> - #include <stdio.h> - #include <sys/param.h> -+#include <sysdep.h> - - - #ifdef SHARED -@@ -29,6 +30,9 @@ - #error makefile bug, this file is for static only - #endif - -+#ifdef INTERNAL_SYSCALL_NOSYSENTER -+extern void *__sbrk_nosysenter (intptr_t __delta); -+#endif - extern ElfW(Phdr) *_dl_phdr; - extern size_t _dl_phnum; - -@@ -141,14 +145,26 @@ - - 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 -+++ misc/sbrk.c -@@ -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 -+++ sysdeps/unix/sysv/linux/i386/brk.c -@@ -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 -+++ sysdeps/unix/sysv/linux/i386/sysdep.h -@@ -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" |