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From: Andreas K. Huttel <dilfridge@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] Make __getrandom_nocancel set errno and add a _nostatus version Date: Fri, 12 Jan 2024 13:24:35 +0000 (GMT) [thread overview] Message-ID: <20240112132435.A9EBE3858D35@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5a85786a9005722be7cb9e70f8874a5f1130daea commit 5a85786a9005722be7cb9e70f8874a5f1130daea Author: Xi Ruoyao <xry111@xry111.site> Date: Thu Jan 4 21:41:20 2024 +0800 Make __getrandom_nocancel set errno and add a _nostatus version The __getrandom_nocancel function returns errors as negative values instead of errno. This is inconsistent with other _nocancel functions and it breaks "TEMP_FAILURE_RETRY (__getrandom_nocancel (p, n, 0))" in __arc4random_buf. Use INLINE_SYSCALL_CALL instead of INTERNAL_SYSCALL_CALL to fix this issue. But __getrandom_nocancel has been avoiding from touching errno for a reason, see BZ 29624. So add a __getrandom_nocancel_nostatus function and use it in tcache_key_initialize. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org> Diff: --- malloc/malloc.c | 4 +++- sysdeps/generic/not-cancel.h | 2 ++ sysdeps/mach/hurd/not-cancel.h | 7 ++++++- sysdeps/unix/sysv/linux/not-cancel.h | 8 ++++++++ 4 files changed, 19 insertions(+), 2 deletions(-) diff --git a/malloc/malloc.c b/malloc/malloc.c index 198e78a162..bcb6e5b83c 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -3139,7 +3139,9 @@ static uintptr_t tcache_key; static void tcache_key_initialize (void) { - if (__getrandom_nocancel (&tcache_key, sizeof(tcache_key), GRND_NONBLOCK) + /* We need to use the _nostatus version here, see BZ 29624. */ + if (__getrandom_nocancel_nostatus (&tcache_key, sizeof(tcache_key), + GRND_NONBLOCK) != sizeof (tcache_key)) { tcache_key = random_bits (); diff --git a/sysdeps/generic/not-cancel.h b/sysdeps/generic/not-cancel.h index d9a6cba443..2dd1064600 100644 --- a/sysdeps/generic/not-cancel.h +++ b/sysdeps/generic/not-cancel.h @@ -51,6 +51,8 @@ __fcntl64 (fd, cmd, __VA_ARGS__) #define __getrandom_nocancel(buf, size, flags) \ __getrandom (buf, size, flags) +#define __getrandom_nocancel_nostatus(buf, size, flags) \ + __getrandom (buf, size, flags) #define __poll_infinity_nocancel(fds, nfds) \ __poll (fds, nfds, -1) diff --git a/sysdeps/mach/hurd/not-cancel.h b/sysdeps/mach/hurd/not-cancel.h index 411f5796ae..69fb3c00ef 100644 --- a/sysdeps/mach/hurd/not-cancel.h +++ b/sysdeps/mach/hurd/not-cancel.h @@ -76,8 +76,10 @@ __typeof (__fcntl) __fcntl_nocancel; #define __fcntl64_nocancel(...) \ __fcntl_nocancel (__VA_ARGS__) +/* Non cancellable getrandom syscall that does not also set errno in case of + failure. */ static inline ssize_t -__getrandom_nocancel (void *buf, size_t buflen, unsigned int flags) +__getrandom_nocancel_nostatus (void *buf, size_t buflen, unsigned int flags) { int save_errno = errno; ssize_t r = __getrandom (buf, buflen, flags); @@ -86,6 +88,9 @@ __getrandom_nocancel (void *buf, size_t buflen, unsigned int flags) return r; } +#define __getrandom_nocancel(buf, size, flags) \ + __getrandom (buf, size, flags) + #define __poll_infinity_nocancel(fds, nfds) \ __poll (fds, nfds, -1) diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h index 50483d9e74..2a7585b73f 100644 --- a/sysdeps/unix/sysv/linux/not-cancel.h +++ b/sysdeps/unix/sysv/linux/not-cancel.h @@ -85,6 +85,14 @@ __writev_nocancel_nostatus (int fd, const struct iovec *iov, int iovcnt) static inline ssize_t __getrandom_nocancel (void *buf, size_t buflen, unsigned int flags) +{ + return INLINE_SYSCALL_CALL (getrandom, buf, buflen, flags); +} + +/* Non cancellable getrandom syscall that does not also set errno in case of + failure. */ +static inline ssize_t +__getrandom_nocancel_nostatus (void *buf, size_t buflen, unsigned int flags) { return INTERNAL_SYSCALL_CALL (getrandom, buf, buflen, flags); }
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