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hurd: keep only required PLTs in ld.so

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We need NO_RTLD_HIDDEN because of the need for PLT calls in ld.so.
See Roland's comment in
https://sourceware.org/bugzilla/show_bug.cgi?id=15605
"in the Hurd it's crucial that calls like __mmap be the libc ones
instead of the rtld-local ones after the bootstrap phase, when the
dynamic linker is being used for dlopen and the like."

We used to just avoid all hidden use in the rtld ; this commit switches to
keeping only those that should use PLT calls, i.e. essentially those defined in
sysdeps/mach/hurd/dl-sysdep.c:

__assert_fail
__assert_perror_fail
__*stat64
_exit

This fixes a few startup issues, notably the call to __tunable_get_val that is
made before PLTs are set up.
This commit is contained in:
Samuel Thibault
2020-11-10 23:35:19 +00:00
parent a40b18b233
commit 3d3316b1de
17 changed files with 20 additions and 34 deletions
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2
sysdeps/generic/_itoa.h
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@ -46,7 +46,7 @@ extern char *_itoa (unsigned long long int value, char *buflim,
extern const char _itoa_upper_digits[];
extern const char _itoa_lower_digits[];
#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
#if IS_IN (libc) || IS_IN (rtld)
hidden_proto (_itoa_upper_digits)
hidden_proto (_itoa_lower_digits)
#endif