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elf: Add initial flag argument to __libc_early_init

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The rseq initialization should happen only for the libc in the base
namespace (in the dynamic case) or the statically linked libc.  The
__libc_multiple_libcs flag does not quite cover this case at present,
so this commit introduces a flag argument to __libc_early_init,
indicating whether the libc being libc is the primary one (of the main
program).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-04-29 15:44:03 +02:00
parent 2ad5d0845d
commit 03e187a41d
6 changed files with 31 additions and 12 deletions
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11
elf/libc-early-init.h
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@ -22,14 +22,17 @@
struct link_map;
/* If LIBC_MAP is not NULL, look up the __libc_early_init symbol in it
and call this function. */
void _dl_call_libc_early_init (struct link_map *libc_map) attribute_hidden;
and call this function, with INITIAL as the argument. */
void _dl_call_libc_early_init (struct link_map *libc_map, _Bool initial)
attribute_hidden;
/* In the shared case, this function is defined in libc.so and invoked
from ld.so (or on the fist static dlopen) after complete relocation
of a new loaded libc.so, but before user-defined ELF constructors
run. In the static case, this function is called directly from the
startup code. */
void __libc_early_init (void);
startup code. If INITIAL is true, the libc being initialized is
the libc for the main program. INITIAL is false for libcs loaded
for audit modules, dlmopen, and static dlopen. */
void __libc_early_init (_Bool initial);
#endif /* _LIBC_EARLY_INIT_H */