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commit 0a8ce6a0966283b17f373f430929bcadef1ae205
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Author: David Kilroy <David.Kilroy@arm.com>
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Date: Wed Feb 12 14:31:17 2020 -0300
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elf: avoid stack allocation in dl_open_worker
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As the sort was removed, there's no need to keep a separate map of
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links. Instead, when relocating objects iterate over l_initfini
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directly.
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This allows us to remove the loop copying l_initfini elements into
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map. We still need a loop to identify the first and last elements that
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need relocation.
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Tested by running the testsuite on x86_64.
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diff --git a/elf/dl-open.c b/elf/dl-open.c
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index 980a28c836ca9a7a..46a4c1e5a3f8d2dd 100644
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--- a/elf/dl-open.c
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+++ b/elf/dl-open.c
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@@ -618,25 +618,18 @@ dl_open_worker (void *a)
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This allows IFUNC relocations to work and it also means copy
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relocation of dependencies are if necessary overwritten.
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__dl_map_object_deps has already sorted l_initfini for us. */
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- unsigned int nmaps = 0;
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+ unsigned int first = UINT_MAX;
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+ unsigned int last = 0;
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unsigned int j = 0;
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struct link_map *l = new->l_initfini[0];
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do
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{
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if (! l->l_real->l_relocated)
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- ++nmaps;
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- l = new->l_initfini[++j];
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- }
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- while (l != NULL);
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- /* Stack allocation is limited by the number of loaded objects. */
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- struct link_map *maps[nmaps];
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- nmaps = 0;
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- j = 0;
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- l = new->l_initfini[0];
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- do
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- {
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- if (! l->l_real->l_relocated)
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- maps[nmaps++] = l;
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+ {
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+ if (first == UINT_MAX)
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+ first = j;
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+ last = j + 1;
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+ }
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l = new->l_initfini[++j];
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}
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while (l != NULL);
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@@ -651,9 +644,12 @@ dl_open_worker (void *a)
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them. However, such relocation dependencies in IFUNC resolvers
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are undefined anyway, so this is not a problem. */
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- for (unsigned int i = nmaps; i-- > 0; )
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+ for (unsigned int i = last; i-- > first; )
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{
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- l = maps[i];
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+ l = new->l_initfini[i];
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+
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+ if (l->l_real->l_relocated)
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+ continue;
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if (! relocation_in_progress)
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{
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