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x86/CET: Don't parse beyond the note end

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Simply check if "ptr < ptr_end" since "ptr" is always incremented by 8.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

	* sysdeps/x86/dl-prop.h (_dl_process_cet_property_note): Don't
	parse beyond the note end.
This commit is contained in:
H.J. Lu 2018-07-27 13:20:51 -07:00
parent 97f2237efa
commit 4591b7db23
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-07-27 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86/dl-prop.h (_dl_process_cet_property_note): Don't
parse beyond the note end.
2018-07-27 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/tst-ofdlocks.c: Return unsupported if

2
sysdeps/x86/dl-prop.h
View File

@ -73,7 +73,7 @@ _dl_process_cet_property_note (struct link_map *l,
unsigned char *ptr = (unsigned char *) (note + 1) + 4;
unsigned char *ptr_end = ptr + note->n_descsz;
while (1)
while (ptr < ptr_end)
{
unsigned int type = *(unsigned int *) ptr;
unsigned int datasz = *(unsigned int *) (ptr + 4);