From 88677348b4de73874ca7d5a47451f42880f65f07 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Netto Date: Tue, 27 Dec 2022 18:11:42 -0300 Subject: Move libc_freeres_ptrs and libc_subfreeres to hidden/weak functions They are both used by __libc_freeres to free all library malloc allocated resources to help tooling like mtrace or valgrind with memory leak tracking. The current scheme uses assembly markers and linker script entries to consolidate the free routine function pointers in the RELRO segment and to be freed buffers in BSS. This patch changes it to use specific free functions for libc_freeres_ptrs buffers and call the function pointer array directly with call_function_static_weak. It allows the removal of both the internal macros and the linker script sections. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell --- misc/efgcvt-template.c | 5 ++++- misc/efgcvt.c | 1 + misc/fstab.c | 3 ++- misc/hsearch.c | 4 ---- misc/mntent.c | 5 ++++- misc/qefgcvt.c | 1 + misc/unwind-link.c | 2 +- 7 files changed, 13 insertions(+), 8 deletions(-) (limited to 'misc') diff --git a/misc/efgcvt-template.c b/misc/efgcvt-template.c index 27a00a3..00d0aa1 100644 --- a/misc/efgcvt-template.c +++ b/misc/efgcvt-template.c @@ -22,6 +22,7 @@ #include #include #include +#include #ifndef SPRINTF # define SPRINTF sprintf @@ -38,7 +39,7 @@ static char FCVT_BUFFER[MAXDIG]; static char ECVT_BUFFER[MAXDIG]; -libc_freeres_ptr (static char *FCVT_BUFPTR); +static char *FCVT_BUFPTR; char * __FCVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign) @@ -73,3 +74,5 @@ __GCVT (FLOAT_TYPE value, int ndigit, char *buf) SPRINTF (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value); return buf; } + +weak_alias (FCVT_BUFPTR, __EFGCVT_FREEMEM_PTR); diff --git a/misc/efgcvt.c b/misc/efgcvt.c index 53673a0..f2a33af 100644 --- a/misc/efgcvt.c +++ b/misc/efgcvt.c @@ -24,6 +24,7 @@ #define __GCVT __gcvt #define __ECVT_R __ecvt_r #define __FCVT_R __fcvt_r +#define __EFGCVT_FREEMEM_PTR __libc_efgcvt_freemem_ptr #include #include diff --git a/misc/fstab.c b/misc/fstab.c index 0e04235..ea4afc7 100644 --- a/misc/fstab.c +++ b/misc/fstab.c @@ -177,7 +177,8 @@ fstab_convert (struct fstab_state *state) /* Make sure the memory is freed if the programs ends while in memory-debugging mode and something actually was allocated. */ -libc_freeres_fn (fstab_free) +void +__libc_fstab_freemem (void) { char *buffer; diff --git a/misc/hsearch.c b/misc/hsearch.c index 615f7f0..f9a3f92 100644 --- a/misc/hsearch.c +++ b/misc/hsearch.c @@ -46,7 +46,3 @@ __hdestroy (void) __hdestroy_r (&htab); } weak_alias (__hdestroy, hdestroy) - -/* Make sure the table is freed if we want to free everything before - exiting. */ -text_set_element (__libc_subfreeres, __hdestroy); diff --git a/misc/mntent.c b/misc/mntent.c index 4a1c544..61dc63f 100644 --- a/misc/mntent.c +++ b/misc/mntent.c @@ -19,6 +19,7 @@ #include #include #include +#include struct mntent_buffer { @@ -28,7 +29,7 @@ struct mntent_buffer /* We don't want to allocate the static buffer all the time since it is not always used (in fact, rather infrequently). */ -libc_freeres_ptr (static void *mntent_buffer); +static void *mntent_buffer; static void * allocate (void *closure) @@ -56,3 +57,5 @@ getmntent (FILE *stream) return __getmntent_r (stream, &buffer->m, buffer->buffer, sizeof (buffer->buffer)); } + +weak_alias (mntent_buffer, __libc_mntent_freemem_ptr) diff --git a/misc/qefgcvt.c b/misc/qefgcvt.c index 91a3e20..a4ea8b8 100644 --- a/misc/qefgcvt.c +++ b/misc/qefgcvt.c @@ -24,6 +24,7 @@ #define __GCVT __qgcvt #define __ECVT_R __qecvt_r #define __FCVT_R __qfcvt_r +#define __EFGCVT_FREEMEM_PTR __libc_qefgcvt_freemem_ptr #include #include diff --git a/misc/unwind-link.c b/misc/unwind-link.c index 63b6559..c1e971b 100644 --- a/misc/unwind-link.c +++ b/misc/unwind-link.c @@ -131,7 +131,7 @@ __libc_unwind_link_after_fork (void) } } -void __libc_freeres_fn_section +void __libc_unwind_link_freeres (void) { if (global_libgcc_handle != NULL) -- cgit v1.1