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

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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>
This commit is contained in:
H.J. Lu 2021-12-21 12:35:47 -08:00
parent d3e4f5a101
commit 163f625cf9
1 changed files with 2 additions and 7 deletions
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9
elf/dl-load.c
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@ -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;
}