robin.thoni/ipxe - git rthoni.com

Michael Brown 00ff3d8bb3 [libc] Fix typo in longjmp() Commit 8ab4b00 ("[libc] Rewrite setjmp() and longjmp()") introduced a regression in which the saved values of %ebx, %esi, and %edi were all accidentally restored into %esp. The result is that the second and subsequent returns from setjmp() would effectively corrupt %ebx, %esi, %edi, and the stack pointer %esp. Use of setjmp() and longjmp() is generally discouraged: our only use occurs as part of the implementation of PXENV_RESTART_TFTP, since the PXE API effectively mandates its use here. The call to setjmp() occurs at the start of pxe_start_nbp(), where there are almost certainly no values held in %ebx, %esi, or %edi. The corruption of these registers therefore had no visible effect on program execution. The corruption of %esp would have been visible on return from pxe_start_nbp(), but there are no known PXE NBPs which first call PXENV_RESTART_TFTP and subsequently attempt to return to the PXE base code. The effect on program execution was therefore similar to that of moving the stack to a pseudo-random location in the 32-bit address space; this will often allow execution to complete successfully since there is a high chance that the pseudo-random location will be unused. The regression therefore went undetected for around one month. Fix by restoring the correct registers from the saved jmp_buf structure. Signed-off-by: Michael Brown <mcb30@ipxe.org>		9 yıl önce
contrib	[errdb] Strip platform error code for non-platform-generated errors	11 yıl önce
src	[libc] Fix typo in longjmp()	9 yıl önce
COPYING	[legal] Update GPLv2 licence text	10 yıl önce
COPYING.GPLv2	[legal] Update GPLv2 licence text	10 yıl önce
COPYING.UBDL	[legal] Add support for the Unmodified Binary Distribution Licence	10 yıl önce
README	[doc] Re-add README file	14 yıl önce

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org