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| author | Ulrich Drepper <drepper@redhat.com> | 2008-01-09 19:35:21 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2008-01-09 19:35:21 +0000 |
| commit | 148e12ed122d75506937cdc8ab2654f8449f2061 (patch) | |
| tree | 74e26dbc976cabefc08145aeac3d3a373ea54470 /sysdeps/unix/sysv/linux/i386/makecontext.S | |
| parent | 71edcafa976a9716a3a848a93c29763e4a3c3002 (diff) | |
| download | glibc-148e12ed122d75506937cdc8ab2654f8449f2061.tar.gz glibc-148e12ed122d75506937cdc8ab2654f8449f2061.tar.xz glibc-148e12ed122d75506937cdc8ab2654f8449f2061.zip | |
* sysdeps/unix/sysv/linux/i386/makecontext.S (__makecontext): Avoid
clobbering memory at or above uc_stack.ss_sp + uc_stack.ss_size. * stdlib/Makefile: Add rules to build and run tst-makecontext2. * stdlib/tst-makecontext2.c: New test.
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/makecontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/makecontext.S | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/makecontext.S b/sysdeps/unix/sysv/linux/i386/makecontext.S index 89be1176f7..ad2340555a 100644 --- a/sysdeps/unix/sysv/linux/i386/makecontext.S +++ b/sysdeps/unix/sysv/linux/i386/makecontext.S @@ -1,5 +1,5 @@ /* Create new context. - Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. + Copyright (C) 2001, 2002, 2005, 2007, 2008 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. @@ -41,13 +41,15 @@ ENTRY(__makecontext) movl 12(%esp), %ecx movl %ecx, oEBX(%eax) - /* Make room on the new stack for the parameters. */ + /* Make room on the new stack for the parameters. + Room for the arguments, return address (== L(exitcode)) and + oLINK pointer is needed. One of the pointer sizes is subtracted + after aligning the stack. */ negl %ecx - leal -8(%edx,%ecx,4), %edx + leal -4(%edx,%ecx,4), %edx negl %ecx /* Align the stack. */ - addl $16, %edx andl $0xfffffff0, %edx subl $4, %edx |