[glibc] elf: Remove excessive p_align check on PT_LOAD segments [BZ #28688]

[H.J. Lu <hjl@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=163f625cf9becbb82dfec63a29e566324129c0cd

commit 163f625cf9becbb82dfec63a29e566324129c0cd
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Dec 21 12:35:47 2021 -0800

    elf: Remove excessive p_align check on PT_LOAD segments [BZ #28688]
    
    p_align does not have to be a multiple of the page size.  Only PT_LOAD
    segment layout should be aligned to the page size.
    
    1: Remove p_align check against the page size.
    2. Use the page size, instead of p_align, to check PT_LOAD segment layout.
    
    Reviewed-by: Florian Weimer <fweimer@redhat.com>

Diff:
---
 elf/dl-load.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/elf/dl-load.c b/elf/dl-load.c
index 721593135e..2a1443387f 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1133,16 +1133,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
 	case PT_LOAD:
 	  /* A load command tells us to map in part of the file.
 	     We record the load commands and process them all later.  */
-	  if (__glibc_unlikely ((ph->p_align & (GLRO(dl_pagesize) - 1)) != 0))
-	    {
-	      errstring = N_("ELF load command alignment not page-aligned");
-	      goto lose;
-	    }
 	  if (__glibc_unlikely (((ph->p_vaddr - ph->p_offset)
-				 & (ph->p_align - 1)) != 0))
+				 & (GLRO(dl_pagesize) - 1)) != 0))
 	    {
 	      errstring
-		= N_("ELF load command address/offset not properly aligned");
+		= N_("ELF load command address/offset not page-aligned");
 	      goto lose;
 	    }