jimzah/openafs
1
0
Fork 0
mirror of https://git.openafs.org/openafs.git synced 2025-01-19 23:40:13 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

glibc24-jmp-buf-mangling-20070516

Browse Source 
FIXES 60440

glibc 2.4 does jmp buf manging for "security"

whatever. deal.
This commit is contained in:
Arkadi Shishlov 2007-05-16 21:21:44 +00:00 committed by Derrick Brashear
parent d608809c24
commit f550e3b3ff
1 changed files with 28 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/lwp/process.c
View File

@ -142,6 +142,31 @@ static char (*EP) ();
static int rc;
static jmp_buf_type *jmpBuffer;
/** Starting with Glibc 2.4 pointers in jmp_buf are mangled (XOR) for "protection".
* On Sparc ucontext functions are not implemented.
*/
#define ptr_mangle(x) (x)
#ifdef AFS_LINUX20_ENV
#ifdef __GLIBC__
#if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 3)
#ifdef AFS_SPARC64_LINUX24_ENV
#undef ptr_mangle
static int ptr_mangle(int p)
{
register char *tls_ptr __asm__("%g7");
return p ^ *(int*)(tls_ptr + 0x18);
}
#else
#error need ptr_mangle support or use UCONTEXT
#endif
#endif
#endif
#endif
afs_int32
savecontext(ep, savearea, sp)
char (*ep) ();
@ -155,7 +180,7 @@ savecontext(ep, savearea, sp)
code = setjmp(savearea->setjmp_buffer);
jmpBuffer = (jmp_buf_type *) savearea->setjmp_buffer;
savearea->topstack = (char *)jmpBuffer[LWP_SP];
savearea->topstack = (char *) ptr_mangle(jmpBuffer[LWP_SP]);
#if defined(DEBUG)
{
@ -178,9 +203,9 @@ savecontext(ep, savearea, sp)
switch (rc) {
case 0:
jmpBuffer = (jmp_buf_type *) jmp_tmp;
jmpBuffer[LWP_SP] = (jmp_buf_type) sp;
jmpBuffer[LWP_SP] = ptr_mangle((jmp_buf_type) sp);
#if defined(AFS_S390_LINUX20_ENV) || defined(AFS_SPARC_LINUX20_ENV) || (defined(AFS_SPARC64_LINUX20_ENV) && defined(AFS_32BIT_USR_ENV))
jmpBuffer[LWP_FP] = (jmp_buf_type) sp;
jmpBuffer[LWP_FP] = ptr_mangle((jmp_buf_type) sp);
#endif
longjmp(jmp_tmp, 1);
break;